Image effects and enhancements

Cloudinary's visual effects and enhancements are a great way to easily change the way your images look within your site or application. For example, you can change the shape of your images, blur and pixelate them, apply quality improvements, make color adjustments, change the look and feel with fun effects, apply filters, and much more. You can also apply multiple effects to an image by applying each effect as a separate chained transformation.

Some transformations use fairly simple syntax, whereas others require more explanation - examples of these types of transformations are shown in the advanced syntax examples.

Besides the examples on this page, there are many more effects available and you can find a full list of them, including examples, by checking out our URL transformation reference.

Here are some popular options for using effects and artistic enhancements. Click each image to see the URL parameters applied in each case:

Simple syntax examples

Here are some examples of effects and enhancements that use a simple transformation syntax. Click the links to see the full syntax for each transformation in the URL transformation reference.

Artistic filters

Apply an artistic filter using the art effect, specifying one of the filters shown.

Available filters

Original image:

Filters:

See full syntax: e_art in the Transformation Reference.

Cartoonify

Make an image look more like a cartoon using the cartoonify effect.

See full syntax: e_cartoonify in the Transformation Reference.

Opacity

Adjust the opacity of an image using the opacity transformation (o in URLs). Specify a value between 0 and 100, representing the percentage of transparency, where 100 means completely opaque and 0 is completely transparent. In this case the image is delivered with 30% opacity:

See full syntax: o (opacity) in the Transformation Reference.

Pixelate

Pixelate an image using the pixelate effect.

See full syntax: e_pixelate in the Transformation Reference.

Sepia

Change the colors of an image to shades of sepia using the sepia effect.

See full syntax: e_sepia in the Transformation Reference.

Vignette

Fade the edges of images into the background using the vignette effect.

See full syntax: e_vignette in the Transformation Reference.

Advanced syntax examples

In general, most of the visual effects and enhancements can take an additional option to tailor the effect to your liking. For some, however, you may need to provide additional syntax and use some more complex concepts. It is important to understand how these advanced transformations work when attempting to use them. The sections below outline some of the more advanced transformations and help you to use these with your own assets.

Remember, there are many more transformations available and you can find a full list of them, including examples, by checking out our URL transformation reference.

3D LUTs

3D lookup tables (3D LUTs) are used to map one color space to another. They can be used to adjust colors, contrast, and/or saturation, so that you can correct contrast, fix a camera's inability to see a particular color shade, or give a final finished look or a particular style to your image.

After uploading a .3dl file to your product environment as a raw file, you can apply it to any image using the lut property of the layer parameter ( l_lut: in URLs), followed by the LUT file name (including the .3dl extension).

Below you can see the docs/textured_handbag.jpg image file in its original color, compared to the image with different LUT files applied. Below these is the code for applying one of the LUTs.

See full syntax: l_lut in the Transformation Reference.

Background color

Use the background parameter (b in URLs) to set the background color of the image. The image background is visible when padding is added with one of the padding crop modes, when rounding corners, when adding overlays, and with semi-transparent PNGs and GIFs.

An opaque color can be set as an RGB hex triplet (e.g., b_rgb:3e2222), a 3-digit RGB hex (e.g., b_rgb:777) or a named color (e.g., b_green). Cloudinary's client libraries also support a # shortcut for RGB (e.g., setting background to #3e2222 which is then translated to rgb:3e2222).

For example, the uploaded image named montain_scene padded to a width and height of 300 pixels with a light blue background:

You can also use a 4-digit or 8-digit RGBA hex quadruplet for the background color, where the 4th hex value represents the alpha (opacity) value (e.g., co_rgb:3e222240 results in 25% opacity).

See full syntax: b (background) in the Transformation Reference.

Content-aware padding

You can automatically set the background color to the most prominent color in the image when applying one of the padding crop modes (pad, lpad, mpad or fill_pad) by setting the background parameter to auto (b_auto in URLs). The parameter can also accept an additional value as follows:

• b_auto:border - selects the predominant color while taking only the image border pixels into account. This is the default option for b_auto.
• b_auto:predominant - selects the predominant color while taking all pixels in the image into account.
• b_auto:border_contrast - selects the strongest contrasting color to the predominant color while taking only the image border pixels into account.
• b_auto:predominant_contrast - selects the strongest contrasting color to the predominant color while taking all pixels in the image into account.

For example, padding the purple-suit-hanky-tablet image to a width and height of 300 pixels, and with the background color set to the predominant color in the image:

See full syntax: b_auto in the Transformation Reference.

Gradient fade

You can also apply a padding gradient fade effect with the predominant colors in the image by adjusting the value of the b_auto parameter as follows:

b_auto:[gradient_type]:[number]:[direction]

Where:

• gradient_type - one of the following values:
  • predominant_gradient - base the gradient fade effect on the predominant colors in the image
  • predominant_gradient_contrast - base the effect on the colors that contrast the predominant colors in the image
  • border_gradient - base the gradient fade effect on the predominant colors in the border pixels of the image
  • border_gradient_contrast - base the effect on the colors that contrast the predominant colors in the border pixels of the image
• number - the number of predominant colors to select. Possible values: 2 or 4. Default: 2
• direction - if 2 colors are selected, this parameter specifies the direction to blend the 2 colors together (if 4 colors are selected each gets interpolated between the four corners). Possible values: horizontal, vertical, diagonal_desc, and diagonal_asc. Default: horizontal

Custom color palette

Add a custom palette to limit the selected color to one of the colors in the palette that you provide. Once the predominant color has been calculated then the closest color from the available palette is selected. Append a colon and then the value palette followed by a list of colors, each separated by an underscore. For example, to automatically add padding and a palette that limits the possible choices to green, red and blue: b_auto:palette_red_green_blue

The palette can be used in combination with any of the various values for b_auto, and the same color in the palette can be selected more than once when requesting multiple predominant colors. For example, padding to a width and height of 300 pixels, with a 4 color gradient fade in the auto colored padding, and limiting the possible colors to red, green, blue, and orange:

Gradient fade into padding

Fade the image into the added padding by adding the gradient_fade effect with a value of symmetric_pad (e_gradient_fade:symmetric_pad in URLs). The padding blends into the edge of the image with a strength indicated by an additional value, separated by a colon (Range: 0 to 100, Default: 20). Values for x and y can also be specified as a percentage (range: 0.0 to 1.0), or in pixels (integer values) to indicate how far into the image to apply the gradient effect. By default, the gradient is applied 30% into the image (x_0.3).

For example, padding the string image to a width and height of 300 pixels, with the background color set to the predominant color, and with a gradient fade effect, between the added padding and 50% into the image.

See full syntax: e_gradient_fade in the Transformation Reference.

Borders

Add a solid border around images with the border parameter (bo in URLs). The parameter accepts a value with a CSS-like format: width_style_color (e.g., 3px_solid_black).

An opaque color can be set as an RGB hex triplet (e.g., rgb:3e2222), a 3-digit RGB hex (e.g., rgb:777) or a named color (e.g., green).

You can also use a 4-digit or 8-digit RGBA hex quadruplet for the color, where the 4th hex value represents the alpha (opacity) value (e.g., co_rgb:3e222240 results in 25% opacity).

Additionally, Cloudinary's client libraries also support a # shortcut for RGB (e.g., setting color to #3e2222 which is then translated to rgb:3e2222), and when using Cloudinary's client libraries, you can optionally set the border values programmatically instead of as a single string (e.g., :border => { :width => 4, :color => 'black' }).

For example, the uploaded JPG image named blue_sweater delivered with a 5 pixel blue border:

Borders are also useful for adding to overlays to clearly define the overlaying image, and also automatically adapt to any rounded corner transformations. For example, the base image given rounded corners with a 10 pixel grey border, and an overlay of the image of sale resized to a 100x100 thumbnail added to the northeast corner:

See full syntax: bo (border) in the Transformation Reference.

Color blind effects

Cloudinary has a number of features that can help you to choose the best images as well as to transform problematic images to ones that are more accessible to color blind people. You can use Cloudinary to:

• Simulate how an image would look to people with different color blind conditions.
• Assist people with color blind conditions to help differentiate problematic colors.
• Analyze images to provide color blind accessibility scores and information on which colors are the hardest to differentiate.

Simulate color blind conditions

You can simulate a number of different color blind conditions using the simulate_colorblind effect. For full syntax and supported conditions, see the e_simulate_colorblind parameter in the Transformation URL API Reference.

Simulate the way an image would appear to someone with deuteranopia (most common form of) color blindness:

See full syntax: e_simulate_colorblind in the Transformation Reference.

Assist people with color blind conditions

Use the assist_colorblind effect (e_assist_colorblind in URLs) to help people with color blind conditions to differentiate between colors.

You can add stripes in different directions and thicknesses to different colors, making them easier to differentiate, for example:

A color blind person would see the stripes like this:

Alternatively, you can use color shifts to make colors easier to distinguish by specifying the xray assist type, for example:

See full syntax: e_assist_colorblind in the Transformation Reference.

Displacement maps

You can displace pixels in a source image based on the intensity of pixels in a displacement map image using the e_displace effect in conjunction with a displacement map image specified as an overlay. This can be useful to create interesting effects in a select area of an image or to warp the entire image to fit a needed design or texture. For example, to make an image wrap around a coffee cup or appear to be printed on a textured canvas.

The displace effect (e_displace in URLs) algorithm displaces the pixels in an image according to the color channels of the pixels in another specified image (a gradient map specified with the overlay parameter). The displace effect is added in the same component as the layer_apply flag. The red channel controls horizontal displacement, green controls vertical displacement, and the blue channel is ignored.

The final displacement of each pixel in the base image is determined by a combination of the red and green color channels, together with the configured x and/or y parameters:

x	Red Channel	Pixel Displacement
Positive	0 - 127	Right
Positive	128 - 255	Left
Negative	0 - 127	Left
Negative	128 - 255	Right

y	Green Channel	Pixel Displacement
Positive	0 - 127	Down
Positive	128 - 255	Up
Negative	0 - 127	Up
Negative	128 - 255	Down

The displacement of pixels is proportional to the channel values, with the extreme values giving the most displacement, and values closer to 128 giving the least displacement.

The displacement formulae are:

• x displacement = (127-red channel)*(x parameter)/127
• y displacement = (127-green channel)*(y parameter)/127

Positive displacement is right and down, and negative displacement is up and left.

For example, specifying an x value of 500, at red channel values of 0 and 255, the base image pixels are displaced by 500 pixels horizontally, whereas at 114 and 141 (127 - 10% and 128 + 10%) the base image pixels are displaced by 50 pixels horizontally.

x	Red Channel	Pixel Displacement
500	0	500 pixels right
500	114	50 pixels right
500	141	50 pixels left
500	255	500 pixels left

This is a standard displacement map algorithm used by popular image editing tools, so you can upload existing displacement maps found on the internet or created by your graphic artists to your product environment and specify them as the overlay asset, enabling you to dynamically apply the displacement effect on other images in your product environment or those uploaded by your end users.

Several sample use-case of this layer-based effect are shown in the sections below.

See full syntax: e_displace in the Transformation Reference.

Use case: Warp an image to fit a 3-dimensional product

Use a displacement map to warp the perspective of an overlay image for final placement as an overlay on a mug:

Using this overlay transformation for placement on a mug:

Use case: Create a zoom effect

To displace the sample image by using a displacement map, creating a zoom effect:

You could take this a step further by applying this displacement along with another overlay component that adds a magnifying glass. In this example, the same displacement map as above is used on a different base image and offset to a different location.

Use case: Apply a texture to your image

Interactive texture demo

For more details on displacement mapping with the displace effect, see the article on Displacement Maps for Easy Image Transformations with Cloudinary. The article includes a variety of examples, as well as an interactive demo.

Distort

Using the distort effect, you can change the shape of an image, distorting its dimensions and the image itself. It works in one of two modes: you can either change the positioning of each of the corners, or you can warp the image into an arc.

To change the positioning of each of the corners, it is helpful to have in mind a picture like the one below. The solid rectangle shows the coordinates of the corners of the original image. The intended result of the distortion is represented by the dashed shape. The new corner coordinates are specified in the distort effect as x,y pairs, clockwise from top-left. For example:

For more details on perspective warping with the distort effect, see the article on How to dynamically distort images to fit your graphic design.

To curve an image, you can specify arc and the number of degrees in the distort effect, instead of the corner coordinates. If you specify a positive value for the number of degrees, the image is curved upwards, like a frown. Negative values curve the image downwards, like a smile.

You can distort text in the same way as images, for example, to add curved text to the frisbee image (e_distort:arc:-120):

See full syntax: e_distort in the Transformation Reference.

Text distortion demo

The CLOUDINARY text in the following demo was created using the text method of the Upload API. Try distorting it by entering different values for the corner coordinates.

Generative AI effects

Cloudinary has a number of transformations that make use of generative AI:

• Generative fill: Naturally extend your images to fit new dimensions
• Generative recolor: Recolor aspects of your images
• Generative remove: Seamlessly remove parts of your images
• Generative replace: Replace items in your images
• Generative restore: Revitalize degraded images

You can use natural language in each of these transformations as prompts to guide the generation process.

Generative fill (Beta)

When resizing images using one of the padding crop modes (pad, lpad, mpad or fill_pad), rather than specifying a background color or using content-aware padding, you can seamlessly extend the existing image into the padded area.

Using generative AI, you can automatically add visually realistic pixels to either or both dimensions of the image. Optionally specify a prompt to guide the result of the generation.

To extend the width of an image, specify the aspect ratio such that the width needs padding. For example, change the following portrait image to be landscape by specifying an aspect ratio of 16:9 with a padding crop, then fill in the extended width using the gen_fill background option (b_gen_fill in URLs):

Similarly, you can change a landscape image into portrait dimensions by specifying the aspect ratio such that the height needs padding:

To extend both the width and the height of an image, you can use the minimum pad mode, ensuring that the dimensions you specify are greater than the original image dimensions. For example, extend this 640 x 480 pixel image to fill a 1100 x 1100 pixel square:

When using padding modes, you can use the gravity parameter to position the original image within the padding, for example, perhaps with the first example, you only want to extend the image to the left, you can position the original image to the right by setting gravity to east:

If you want to see something specific in the generated parts of the image, you can specify a prompt using natural language. For example, add a mug of coffee and cookies to the extended regions (b_gen_fill:prompt_mug%20of%20coffee%20and%20cookies):

If you want to ensure that the background is extended in a natural fashion, without taking elements of the foreground into account, then you can set the ignore-foreground parameter to true. This is in fact the default behavior, unless a foreground object touches the edge of the image. You can see in the following example that the bike wheel touches the edge of the image, so in this case the foreground would not be ignored, however, this has consequences of the bike being generated in the extended image. Therefore, in this case it is better to force the foreground to be ignored:

See full syntax: b_gen_fill in the Transformation Reference.

Generative recolor (Beta)

Recolor elements of your images using generative AI.

Use natural language to describe what you want to recolor in the image. For example, turn the jacket on the right pink (e_gen_recolor:prompt_the%20jacket%20on%20the%20right;to-color_pink):

To recolor all instances of the prompt in the image, specify multiple_true, for example, recolor all the devices in the following image to a particular orange color, with hex code EA672A:

If there are a number of different things that you want to recolor, you can specify more than one prompt. Note that when you specify more than one prompt, multiple instances of each prompt are recolored, regardless of the multiple parameter setting. For example, in this image, all devices and both people's hair are recolored:

AI-powered object recolor demo

See full syntax: e_gen_recolor in the Transformation Reference.

Generative remove (Beta)

This effect uses generative AI to remove an object from an image and fill in the space with artificially generated, visually realistic pixels.

Use natural language to describe what you want to remove from the image, for example, remove the stick from this image of a dog with a stick in its mouth (e_gen_remove:prompt_the%20stick):

The natural language lets you be specific about what you want to remove. In the following example, specifying only 'the child' removes the child in the middle, whereas specifying the 'the child in green' removes the child wearing the green jacket:

Remove multiple items

If there is more than one of the same item in an image, you can remove them all using by setting multiple to true. For example, remove all the geese in this image (e_gen_remove:prompt_goose;multiple_true):

Otherwise, only one is removed:

If there are a number of different things that you want to remove, you can specify more than one prompt. Note that when you specify more than one prompt, multiple instances of each prompt are removed regardless of the multiple parameter setting. For example, in this image, all phones are removed, together with the mouse and keyboard:

Remove items from a region

You can also specify one or more region if you know the co-ordinates of the pixels that you want to remove. For each region, specify the x,y co-ordinates of the top left of the region, plus its width and height in pixels. For example, remove the objects from the top left and bottom right of the image:

Remove shadows and reflections

By default, shadows and reflections cast by objects specified in the prompt are not removed. If you want to remove the shadow/reflection, set the remove-shadow parameter to true:

Remove text

You can remove all the text from an image by setting the prompt to text e.g. e_gen_remove:prompt_text, or e_gen_remove:prompt_(dog;text).

For example, remove the text and person from this store front (e_gen_remove:prompt_(text;person)):

If you don't want to remove all the text in the image, specify the object you want to remove the text from by using the syntax text:<object> as the prompt (either as the only prompt, or together with other prompts as in the previous example).

For example, in the following image there is text in the main part of the image in addition to text on the mobile screen. You can remove the text on the mobile screen only, as follows (e_gen_remove:prompt_text:the%20mobile%20screen):

See full syntax: e_gen_remove in the Transformation Reference.

Generative replace (Beta)

This effect uses generative AI to replace objects in images with other objects.

Use natural language to describe what you want to replace in the image, and what to replace it with.

For example, replace "the picture" with "a mirror with a silver frame" (e_gen_replace:from_the%20picture;to_a%20mirror%20with%20a%20silver%20frame):

If you want to maintain the shape of the object you're replacing, set the preserve-geometry parameter to true. For example, below, notice the difference between the position of the sleeves and neckline of the sweater, with and without preserving the geometry when the shirt is replaced with a cable knit sweater:

See full syntax: e_gen_replace in the Transformation Reference.

Generative restore (Beta)

Revitalize degraded and poor quality images using generative AI.

You can use the gen_restore effect (e_gen_restore in URLs) to improve images that have become degraded through repeated processing and compression, in addition to enhancing old images by improving sharpness and reducing noise.

Particularly useful for user generated content (UGC), generative restore can:

• Remove severe compression artifacts
• Reduce noise from grainy images
• Sharpen blurred images

Use the slider in this example to see the difference between the original image on the left and the restored image on the right:

You can use the generative restore effect together with the improve effect for even better results. While generative restore tries to rectify compression artifacts, the improve effect addresses color, contrast and brightness.

See full syntax: e_gen_restore in the Transformation Reference.

Layer blending and masking

Effects: screen, multiply, overlay, mask, anti_removal

These effects are used for blending an overlay with an image.

For example, to make each pixel of the sample image brighter according to the pixel value of the overlaid cloudinary_icon_blue image:

See full syntax: e_screen, e_multiply, e_overlay, e_mask, e_anti_removal in the Transformation Reference.

Outline

The outline effect (e_outline in URLs) enables you to add an outline to your transparent images. The parameter can also be passed additional values as follows:

• mode - how to apply the outline effect which can be one of the following values: inner, inner_fill, outer, fill. Default value: inner and outer.
• width - the first integer supplied applies to the thickness of the outline in pixels. Default value: 5. Range: 1 - 100
• blur - the second integer supplied applies to the level of blur of the outline. Default value: 0. Range: 0 - 2000

Use the color parameter (co in URLs) to define a new color for the outline (the default is black). The color can be specified as an RGB hex triplet (e.g., rgb:3e2222), a 3-digit RGB hex (e.g., rgb:777) or a named color (e.g., green). For example, to add an orange outline:

You can also add a multi-colored outline by creating successive outline effect components. For example:

See full syntax: e_outline in the Transformation Reference.

Replace color

You can replace a color in an image using the replace_color effect. Unless you specify otherwise, the most prominent high-saturation color in an image is selected as the color to change. By default, a tolerance of 50 is applied to this color, representing a radius in the LAB color space, so that similar shades are also replaced, achieving a more natural effect.

For example, without specifying a color to change, the most prominent color is changed to the specified maroon:

Adding a tolerance value of 10 (e_replace_color:maroon:10) prevents the handle also changing color:

Specifying blue as the color to replace (to a tolerance of 80 from the color #2b38aa) replaces the blue sides with parallel shades of maroon, taking into account shadows, lighting, etc:

See full syntax: e_replace_color in the Transformation Reference.

Rotation

Rotate an image by any arbitrary angle in degrees with the angle parameter (a in URLs). A positive integer value rotates the image clockwise, and a negative integer value rotates the image counterclockwise. If the angle is not a multiple of 90 then a rectangular transparent bounding box is added containing the rotated image and empty space. In these cases, it's recommended to deliver the image in a transparent format if the background is not white.

You can also take advantage of special angle-rotation modes, such as a_hflip / a_vflip to horizontally or vertically mirror flip an image, a_auto_right / a_auto_left to rotate an image 90 degrees only if the requested aspect ratio is different than the original image's aspect ratio, or a_ignore to prevent Cloudinary from automatically rotating images based on the images's stored EXIF details.

For details on these rotation modes, see the Transformation Reference.

Rotaation examples

The following images apply various rotation options to the sample image:

1. Rotate the image by 90 degrees:
   
   
2. Rotate the image by -20 degrees (automatically adds a transparent bounding box):
   
   
3. Vertically mirror flip the image and rotate by 45 degrees (automatically adds a transparent bounding box):
   
   
4. Crop the image to a 200x200 circle, then rotate the image by 30 degrees (automatically adds a transparent bounding box) and finally trim the extra whitespace added:
   

See full syntax: a (angle) in the Transformation Reference.

Rounding

Many website designs need images with rounded corners, while some websites require images with a complete circular or oval (ellipse) crop. Twitter, for example, uses rounded corners for its users' profile pictures.

Programmatically, rounded corners can be achieved using the original rectangular images combined with modern CSS properties or image masking overlays. However, it is sometimes useful to deliver images with rounded corners in the first place. This is particularly helpful when you want to embed images inside an email (most mail clients can't add CSS based rounded corners), a PDF or a mobile application. Delivering images with already rounded corners is also useful if you want to simplify your CSS and markup or when you need to support older browsers.

Transforming an image to a rounded version is done using the radius parameter (r in URLs). You can manually specify the amount to round various corners, or you can set it to automatically round to an exact ellipse or circle.

Manually setting rounding values

To manually control the rounding, use the radius parameter with between 1 and 4 values defining the rounding amount (in pixels, separated by colons), following the same concept as the border-radius CSS property. When specifying multiple values, keep a corner untouched by specifying '0'.

• One value: Symmetrical. All four corners are rounded equally according to the specified value.
• Two values: Opposites are symmetrical. The first value applies to the top-left and bottom-right corners. The second value applies to the top-right and bottom-left corners.
• Three values: One set of corners is symmetrical. The first value applies to the top-left. The second value applies to the top-right and bottom-left corners. The third value applies to the bottom-right.
• Four values: The rounding for each corner is specified separately, in clockwise order, starting with the top-left.

For example:

Automatically rounding to an ellipse or circle

Rather than specifying specific rounding values, you can automatically crop images to the shape of an ellipse (if the requested image size is a rectangle) or a circle (if the requested image size is a square). Simply pass max as the value of the radius parameter instead of numeric values.

The following example transforms an uploaded JPEG to a 250x150 PNG with maximum radius cropping, which generates the ellipse shape with a transparent background:

As the following example shows, displaying pictures of your web site's users as circle headshots is very easy to achieve with Cloudinary using face gravity with max radius:

You can also overlay circular pictures of your users on other images using the layer_apply flag that tells Cloudinary to apply the rounding (and other transformations) to the overlay image and not to the base image:

See full syntax: r (round corners) in the Transformation Reference.

Shadow

There are two ways to add shadow to your images:

• Use the shadow effect to apply a shadow to the edge of the image.
• Use the dropshadow effect to apply a shadow to objects in the image.

Shadow effect

The shadow effect (e_shadow in URLs) applies a shadow to the edge of the image. You can use this effect to make it look like your image is hovering slightly above the page.

In this example, a dark blue shadow with medium blurring of its edges (co_rgb:483d8b,e_shadow:50) is added with an offset of 60 pixels to the top right of the photo (x_60,y_-60):