On Thu, Apr 17, 2014 at 2:46 AM, Jonas Sicking <jo...@sicking.cc> wrote:
> The problem here stemms from that orientation data lives as "metadata" > in the EXIF data of image formats. This means that many tools has > simply ignored that metadata. > > The result seems to have been that people open their images in tools > that ignore the EXIF metadata. Then rotates the pixel data using that > tool. Then saves the image again while keeping the EXIF metadata > unchanged. > > This now means the pixels have been rotated (say) 90 degrees, but the > EXIF metadata still says "rotate image 90 degrees". So any tool that > now honors the EXIF renders the picture *wrong*. > > So effectively the EXIF metadata has to be ignored in order to keep > webcompat. That was the case even before image-orientation was > implemented. > > FWIW I believe that WebP is remaking this same mistake. Would be cool > if someone tried to prevent this from happening. > The question was "why is this a CSS style instead of a property on <img>", not "why isn't this just the default". -- Glenn Maynard
