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There are many ways to optimize PNG files, but one optimization which is commonly overlooked involves the PNG's transparent background. If you’ve chosen to use PNGs instead of a more compact format like JPG, mainly for the PNG's support of a transparent background (alpha channel), read on and see how dynamic underlays can reduce your file size by as much as 1:5.
Graphic designers of sites and apps sometimes wish to display clipped photos on top of a certain background. A common example is a news site that shows a head shot of the author, or a figure mentioned in the article. Typically, the images are clipped using photo editing software like Photoshop, and then they can then be placed above background colors, patterns and between text paragraphs.