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

[Marti M. <mar...@li...>]

Hi Aaron,

Thanks for reporting, but unfortunately I cannot reproduce the issue. I have extracted the profile embedded in file8.jp2 and it seems a quite typical gray profile. 
Tried transicc and numbers goes fine. Also tried tificc with several combinations of the profile as input and as output and everything works as expected.
Could you please tell me details how are you doing the transform? In special, are you using the fast_float plugin?
 
Thanks again and best regards
Marti Maria

> 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
>