Re: [Lcms-user] [ANNOUNCE] Little CMS 2.13 released

[Aaron B. <bo...@gm...>]

Thanks for the fix, and once again thank you for this incredible library.

On Sun, Jan 30, 2022 at 11:03 AM Marti Maria <mar...@li...>
wrote:

>
> It is now fixed in git. This bug has been there since 2.10
>
>
> https://github.com/mm2/Little-CMS/commit/fdbfb7694f9d7048d53674b79ddfc38068bfdaf7
>
> A true pity, but 2.13 is already released. You can avoid the bug on the
> official releases by using cmsFLAGS_NOOPTIMIZE when input grayscale is
> being used. I guess this is not very common as the flaw has been unnoticed
> by years. In 2.13 is more evident because another bug was discarding
> channels G and B in the gray->RGB optimized transforms, anyway that was
> wrong too.
>
> Regards
> Marti
>
>
>
>
> On 30 Jan 2022, at 02:48, Aaron Boxer <bo...@gm...> wrote:
>
> Hi Marti,
>
> Thank you for this new release! I think I have found a regression, though.
>
> I maintain the Grok Jpeg 2000 codec, and we use lcms2 to apply ICC
> profiles after
> decompressing from JPEG 2000.
>
> The attached file file8.jp2 is a monochrome image
> with a grayscale ICC profile.  For decompression, the codec decompresses
> the single channel, applies the ICC profile, and then converts it to RGB
> (by duplicating the mono channel)
>
> file8.jp2.tif is the decompressed result with the older version of lcms2.
> file8.jp2_new.tif is the result with lcms2 2.13. You can see that the
> image w/ 2.13
> is saturating at the top of the range.
>
> If you need, I can point you to the code that applies the ICC profile.
>
> Let me know if I can provide any more information.
> Thanks again,
> Aaron
>
>
>
>
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