- From: Pierre-Anthony Lemieux <pal@sandflow.com>
- Date: Wed, 15 Nov 2023 11:47:57 -0800
- To: Chris Lilley <chris@w3.org>
- Cc: Leo Barnes <lbarnes@apple.com>, "Portable Network Graphics (PNG) Working Group" <public-png@w3.org>
> Thanks for that data, although it mainly covers JPEG-compressed images. I think I understand gainmap in the context of compatibility with JPEG 1, which is ubiquitous and cannot support HDR natively. I am not sure how this applies to PNG and other formats that can support HDR natively. On Wed, Nov 15, 2023 at 11:12 AM Chris Lilley <chris@w3.org> wrote: > > Thanks for that data, although it mainly covers JPEG-compressed images. > > I would be interested to see a comparison between, for example: > > 8 bit PNG compressed SDR image plus 10 bit PNG compressed HDR image > 8 bit PNG compressed baseline SDR image containing un-resampled 16-bit gain map > > both in terms of file sizes and also in terms of per-pixel error visualization in the reconstructed alternate image. > > On 2023-11-15 14:03, Leo Barnes wrote: > > The claim of storage efficiency has not been backed up by any measurements that I have seen. > > > It's in the white-paper published by Adobe: > > -- > Chris Lilley > @svgeesus > Technical Director @ W3C > W3C Strategy Team, Core Web Design > W3C Architecture & Technology Team, Core Web & Media
Received on Wednesday, 15 November 2023 19:48:15 UTC