Google has its WebP image format, which images now lossless can be saved. In addition, support for transparency added; this can also with the lossy compression to be used.
Google introduced WebP format in the autumn of last year as an alternative to jpeg, but very popular is the format for images yet. Possible that will change, now Google the format tweaked: support for lossless compression added. This allows images to be compressed, but the quality of the image is not backwards.
In addition, support for an alpha channel added, making transparency possible. Transparency is also supported in the lossy mode of WebP, which detracts from the quality of an image. With the new features, combines WebP advantages of the jpeg and png codecs: jpeg is a lossy format, while png, a lossless format, transparency support. With the WebP format images for both lossy as transparent, which in certain cases can be useful: images lossless compressed, take up more space.
Also lossless would be WebP perform better than png: according to Google, take a lossless WebP images 28 to 45 percent less space than a png. The company warns, however, that the implementation of WebP still not perfect: this is not yet optimized for speed, and there is still the subject of experiment in the specification.
The biggest problem of WebP is the uncertainty or browsermakers and producers of graphics software support for the format. At this moment only support Opera and Chrome WebP, although browsers that WebM codec support via a detour WebP images, can view. This allows WebP images however in Firefox are shown. The support among makers of graphics software is also lean: Photoshop supports the format, for example, not only a number of open source packages do that.