![]() There are some caveats, however, in particular for non-web usage: The WEBP image format was developed by google, and while already a few years old, it is still considered the far-superior, next-generation image format for the web. WEBP supports both lossless image compression, and lossy image compression - whilst JPEG compression is always lossy.WEBP is supported by all major modern browsers.WEBP supports progressive loading - as does JPEG.WEBP supports alpha transparency - JPEG does not.WEBP supports animation - JPEG does not.While compressing to substantially smaller file sizes than JPEG, WEBP still offers identical visual quality as JPEG.WEBP offers a much better quality-to-size ratio with roughly 30% better file size compression over JPEG.In virtually all metrics that matter on the web, WEBP is a superior image format to JPEG: Illustration of perceptible noise introduced by lossy JPEG compression vs. Screenshots, illustrated images, charts, or other images where image quality and the reduction of noise matters more than image file size.Compression of small icon images (for 64 pixel images PNG actually compresses better than JPEG at these scales), or.PNG on the other hand, contains lossless compression data (no data loss), and is more suited towards either: The JPEG format is particularly suitable for photographs, and “real-world” images where it is able to provide a very high degree of data compression, while the human eye is still incapable of perceiving the noise introduced by the loss of data. JPEG images contain lossy compression data, which means that some image data is lost through approximations in order to achieve a higher degree of compression. In a future release, I will try to offer a different approach that uses fewer privileges.There are specific cases for when it is better to use either JPEG or PNG, depending on your needs. I regret having to use the "All sites" permission, but most images these days load from a different server, and that creates a cross-site access problem (canvas taint) that often blocks the extension from saving unless it has permission in advance. The button bar may not appear and images may not be saved if scripts are blocked from running in the page (for example, by the NoScript extension). * Ctrl+click "Save webP as." to save in JPEG format at 92% quality (on Mac, use Command+click)Įxtensions can only save under your Downloads folder, but you can set up date or site folders to help keep organized. * Shift+click "Save webP as." to save in PNG format * Click "Save webP as." to show format/quality buttons overlaid on the image These are the default actions, but you can switch them around to fit your needs (on the Options panel): ![]() If you want to discourage sites from sending webP format images at all, especially if you are having trouble saving GIFv files, check out my other extension: Don't "Accept" image/webp. There also is a button to re-request the image masquerading as Internet Explorer 11 (you might need to click it a second time because Firefox likes to serve the cached iamge), and a button to send animated WebP images to for conversion to animated GIFs. This extension allows converting from WebP (or any other format) to PNG or JPEG. ![]()
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