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Vue.js Tutorial: Image Optimization for Web Apps

Vue.js Tutorial: Image Optimization for Web Apps

Launched in 2014 as an open-source JavaScript framework for building user interfaces for web apps, Vue.js has become a tool of choice for many developers. Currently, Vue.js is the most starred front-end JavaScript framework on GitHub with over 145,000 stars.

Optimizing images that reside in Vue.js apps with the Cloudinary Vue SDK is a cinch. This article explains why and describes the steps.

Background

The smaller an image, the faster the browser can download it for display. Optimizing images means delivering them in the smallest-possible size without losing visual quality, leading to bandwidth savings and faster loading of websites.

That image optimization is mandatory for all websites is a case that can easily be made. That’s because faster image loading on websites invariably lifts audience conversion rates. In fact, studies have shown that half the online visitors expect a website to load within two seconds.

Cloudinary the Media Full-Stack Platform

With Cloudinary, you can effectively and efficiently optimize digital media—regardless of the programming language in which you code—because Cloudinary automatically performs most of the related tasks by default. Besides, the platform’s delivery process through integrated content delivery networks (CDNs) ensures prompt transmission to both desktop and mobile audiences.

After uploading images to Cloudinary, you can leverage its major capabilities, as described in the subsections below. For details on other Cloudinary options for optimizing images, read the documentation section Image Transformations.

Automatic Quality Adjustment and Encoding

Adding the q_auto parameter to an image’s URL enables Cloudinary to select the optimal quality-compression level and encoding settings according to the image content, format, and viewing browser. The result is, gratifyingly, a smaller image that still retains its original visual quality. See this example:

Ruby:
cl_image_tag("woman.jpg", :quality=>"auto")
PHP:
cl_image_tag("woman.jpg", array("quality"=>"auto"))
Python:
CloudinaryImage("woman.jpg").image(quality="auto")
Node.js:
cloudinary.image("woman.jpg", {quality: "auto"})
Java:
cloudinary.url().transformation(new Transformation().quality("auto")).imageTag("woman.jpg");
JS:
cloudinary.imageTag('woman.jpg', {quality: "auto"}).toHtml();
jQuery:
$.cloudinary.image("woman.jpg", {quality: "auto"})
React:
<Image publicId="woman.jpg" >
  <Transformation quality="auto" />
</Image>
Angular:
<cl-image public-id="woman.jpg" >
  <cl-transformation quality="auto">
  </cl-transformation>
</cl-image>
.Net:
cloudinary.Api.UrlImgUp.Transform(new Transformation().Quality("auto")).BuildImageTag("woman.jpg")
Android:
MediaManager.get().url().transformation(new Transformation().quality("auto")).generate("woman.jpg");
iOS:
imageView.cldSetImage(cloudinary.createUrl().setTransformation(CLDTransformation().setQuality("auto")).generate("woman.jpg")!, cloudinary: cloudinary)
woman

To further adjust the visual quality, edit q_auto to read q_auto:best, q_auto:low, q_auto:good, or q_auto:eco.

Automatic Formatting

Adding the f_auto parameter to an image’s URL enables Cloudinary to analyze the image content and select the best format for delivery, such as WebP for Chrome browsers or JPEG-XR for Internet Explorer browsers. For all other browsers, Cloudinary delivers images in their original format.

Note
With f_auto and q_auto set, Cloudinary would, as a rule, pick WebP or JPEG-XR for display on Chrome or IE, respectively. However, if the quality algorithm determines that PNG-8 or PNG-24 is optimal, Cloudinary might pick either of those formats for certain images.

Resizing and Cropping

To resize an image, add either or both of these two parameters to the URL: width (w) and height (h). Cloudinary leaves the aspect ratio as is while performing resizing tasks.

Here are three examples:

Ruby:
cl_image_tag("sample.jpg", :width=>0.5, :crop=>"scale")
PHP:
cl_image_tag("sample.jpg", array("width"=>0.5, "crop"=>"scale"))
Python:
CloudinaryImage("sample.jpg").image(width=0.5, crop="scale")
Node.js:
cloudinary.image("sample.jpg", {width: "0.5", crop: "scale"})
Java:
cloudinary.url().transformation(new Transformation().width(0.5).crop("scale")).imageTag("sample.jpg");
JS:
cloudinary.imageTag('sample.jpg', {width: "0.5", crop: "scale"}).toHtml();
jQuery:
$.cloudinary.image("sample.jpg", {width: "0.5", crop: "scale"})
React:
<Image publicId="sample.jpg" >
  <Transformation width="0.5" crop="scale" />
</Image>
Angular:
<cl-image public-id="sample.jpg" >
  <cl-transformation width="0.5" crop="scale">
  </cl-transformation>
</cl-image>
.Net:
cloudinary.Api.UrlImgUp.Transform(new Transformation().Width(0.5).Crop("scale")).BuildImageTag("sample.jpg")
Android:
MediaManager.get().url().transformation(new Transformation().width(0.5).crop("scale")).generate("sample.jpg");
iOS:
imageView.cldSetImage(cloudinary.createUrl().setTransformation(CLDTransformation().setWidth(0.5).setCrop("scale")).generate("sample.jpg")!, cloudinary: cloudinary)
sample
Ruby:
cl_image_tag("sample.jpg", :height=>200, :crop=>"scale")
PHP:
cl_image_tag("sample.jpg", array("height"=>200, "crop"=>"scale"))
Python:
CloudinaryImage("sample.jpg").image(height=200, crop="scale")
Node.js:
cloudinary.image("sample.jpg", {height: 200, crop: "scale"})
Java:
cloudinary.url().transformation(new Transformation().height(200).crop("scale")).imageTag("sample.jpg");
JS:
cloudinary.imageTag('sample.jpg', {height: 200, crop: "scale"}).toHtml();
jQuery:
$.cloudinary.image("sample.jpg", {height: 200, crop: "scale"})
React:
<Image publicId="sample.jpg" >
  <Transformation height="200" crop="scale" />
</Image>
Angular:
<cl-image public-id="sample.jpg" >
  <cl-transformation height="200" crop="scale">
  </cl-transformation>
</cl-image>
.Net:
cloudinary.Api.UrlImgUp.Transform(new Transformation().Height(200).Crop("scale")).BuildImageTag("sample.jpg")
Android:
MediaManager.get().url().transformation(new Transformation().height(200).crop("scale")).generate("sample.jpg");
iOS:
imageView.cldSetImage(cloudinary.createUrl().setTransformation(CLDTransformation().setHeight(200).setCrop("scale")).generate("sample.jpg")!, cloudinary: cloudinary)
sample
Ruby:
cl_image_tag("sample.jpg", :width=>200, :height=>100, :crop=>"scale")
PHP:
cl_image_tag("sample.jpg", array("width"=>200, "height"=>100, "crop"=>"scale"))
Python:
CloudinaryImage("sample.jpg").image(width=200, height=100, crop="scale")
Node.js:
cloudinary.image("sample.jpg", {width: 200, height: 100, crop: "scale"})
Java:
cloudinary.url().transformation(new Transformation().width(200).height(100).crop("scale")).imageTag("sample.jpg");
JS:
cloudinary.imageTag('sample.jpg', {width: 200, height: 100, crop: "scale"}).toHtml();
jQuery:
$.cloudinary.image("sample.jpg", {width: 200, height: 100, crop: "scale"})
React:
<Image publicId="sample.jpg" >
  <Transformation width="200" height="100" crop="scale" />
</Image>
Angular:
<cl-image public-id="sample.jpg" >
  <cl-transformation width="200" height="100" crop="scale">
  </cl-transformation>
</cl-image>
.Net:
cloudinary.Api.UrlImgUp.Transform(new Transformation().Width(200).Height(100).Crop("scale")).BuildImageTag("sample.jpg")
Android:
MediaManager.get().url().transformation(new Transformation().width(200).height(100).crop("scale")).generate("sample.jpg");
iOS:
imageView.cldSetImage(cloudinary.createUrl().setTransformation(CLDTransformation().setWidth(200).setHeight(100).setCrop("scale")).generate("sample.jpg")!, cloudinary: cloudinary)
sample

To have Cloudinary crop an image, add the crop (c) parameter to the URL and specify one of these modes: scale, fit, mfit, fill, lfill, limit, pad, lpad, mpad, crop, thumb, imagga_crop, or imagga_scale.

Vue.js Tutorial: Image Optimization in Web Apps

This section describes how to optimize images in Vue.js apps with the Cloudinary SDK.

Automatic Quality and Encoding

You can edit the quality level of images in Vue.js apps with JavaScript code, for example:

<cld-image publicId="cave.jpg" ><cld-transformation quality="50" /></cld-image>

Here, under quality, 50 is your choice of quality level on a 0-100 scale. The lower the level, the smaller the image size. The higher the level, the larger the size and the better the quality.

But why do it manually like that? Instead, automate that compression task by taking advantage of Cloudinary with this code:

<cld-image publicId="prosper.jpg" >
  <cld-transformation quality="auto" />
</cld-image>

Adding the quality=”auto” parameter is the best way to significantly reduce image size through automation.

To further narrow the size or to ensure higher-than-average quality, replace auto with auto:best , auto:good, auto:eco, or auto:low, for example:

<cld-image publicId="prosper.jpg" >
  <cld-transformation quality="auto:low" />
</cld-image>

Automatic Formatting

Adding the fetchFormat=”auto” parameter is the best way to ensure that Cloudinary delivers your images in the optimum format to the viewing browser in question. See this code example:

<cld-image publicId="prosper.jpg" >
  <cld-transformation width="500" fetchFormat="auto" crop="scale" />
</cld-image>

Vue.js

Image Resizing and Cropping

By adding the relevant parameters to the <cld-image> and <cld-transformation> Vue.js components, you can resize and crop images, for example:

<cld-image publicId="family_bench.jpg" >
  <cld-transformation width="150" height="150" gravity="faces" crop="fill" />
</cld-image>

The fill cropping method generates an image size of 150 x 150 pixels while retaining the original aspect ratio.

To change the size, assign new values to the width and height parameters. Note this neat Cloudinary capability: if you set only width or height, Cloudinary automatically updates the other parameter to maintain the aspect ratio. An example:

<cld-image publicId="prosper.jpg" >
  <cld-transformation width="0.5" crop="scale" />
</cld-image>

Here, despite the width adjustment with the 0.5 value, the aspect ratio remains intact.

Another example:

<cld-image publicId="prosper.jpg" >
  <cld-transformation width="200" height="100" crop="scale" />
</cld-image>

Here, too, the aspect ratio stays the same notwithstanding the resizing to a width of 200 and a height of 100 pixels.

Conclusion

This Vue.js tutorial for Image optimization is paramount for the performance of web apps. Do mount the effort to properly optimize and cache their images. For an excellent insight and suggestions on how to optimize JPEG images without compromising quality, read this Cloudinary article.


Further Reading on Image Optimization

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