- From: Matthew Wilcox <elvendil@gmail.com>
- Date: Fri, 19 Oct 2012 11:34:02 +0100
- To: Kornel <kornel@geekhood.net>
- Cc: public-respimg@w3.org
On 19 October 2012 10:53, Kornel <kornel@geekhood.net> wrote: > On 19 paź 2012, at 08:29, Matthew Wilcox <elvendil@gmail.com> wrote: > >> Though I would *love* alpha on lossy images. A number of designs from my work have to be turned back and edited because they're simply not practical with PNG alphas. > > PNG does support a form of lossy images with alpha — palette-quantised images can have varying degrees of transparency. I use this via ImgAlpha and ImgOptim on the Mac. It's only suitable for limited colour pallet images and is not a solution appropriate for photographic imagery with an alpha. That's the point. > The problem is that Photoshop doesn't support this, so many authors assume it's impossible. > > http://pngmini.com http://pngquant.org > > While it's not as good as WebP: > > http://pngmini.com/vs-webp/ > > IMHO for majority of cases it's "good enough". No it isn't. As noted; I've had to send designs back because they're not practically achievable with the file formats we have to work with. > There's also potential to make 24-bit PNG smaller by removing information (e.g. by posterising and lossy application of PNG's filters). You're arguing about how to "optimise" an image for a file format that is not the correct one for the job. > -- > regards, Kornel
Received on Friday, 19 October 2012 10:34:29 UTC