Bug 322810

Summary:	Does not support 16-bit float images.
Product:	[Applications] krita	Reporter:	Adrien <perso>
Component:	General	Assignee:	Krita Bugs <krita-bugs-null>
Status:	RESOLVED DOWNSTREAM
Severity:	normal	CC:	halla, jedfrechette, sven.langkamp
Priority:	NOR
Version:	2.6.4
Target Milestone:	---
Platform:	Debian testing
OS:	Linux
Latest Commit:		Version Fixed In:
Sentry Crash Report:

Description Adrien 2013-07-25 11:12:52 UTC

Hi,

We received this bug on the Debian Bug tracker system :
Several of the Texture templates provided with Krita are for 16-bit half  
float images, however, the Debian package does not support images with  
this bit depth. Using one of these templates produces an image that has  
been promoted to 32-bit float. Attempting to open a half float image  
created in another program fails with the error message "Cannot create  
storage".
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=717508


I confirm that when opening the 16 bits float texture templates, it is promoted to a 32 bits float. In debian we haven't these dependencies : vc, opengtl, ocio. Maybe it's related ?

Comment 1 Halla Rempt 2013-07-25 11:18:36 UTC

I strongly recommend adding those dependencies, but that cannot be the issue here.  I only have got a Debian vm that installes Krita 2.4 here -- I'm afraid I'm not a debian user myself -- so I cannot check. Does Krita offer a 16f option in the create image screen? If not, it means that openexr is built without support for the half format. I'm not sure how that is possible, though...

Comment 2 Adrien 2013-07-25 11:31:39 UTC

(In reply to comment #1)
>  Does Krita offer a16f option in the create image screen?

If I do New -> Custom Document, with depth = 16 bits, it's OK. In Image->properties, I can see the depth is still 16 bits.

But If I choose New -> Texture Templates -> Texture 1k 16 bits float rgb, then in Image-> properties, depth is now 32 bits.

Concerning OpenExr, the description of the Debian package says :
Support for the "half" 16-bit floating-point pixel format.
http://packages.debian.org/jessie/libopenexr6

Please let me know if you need more testing on a Debian system.

Comment 3 Halla Rempt 2013-07-25 11:35:13 UTC

Hm, but is "New -> Custom Document, with depth = 16 bit"  16 bit float or 16 bit (integer)?

Comment 4 jedfrechette 2013-07-25 15:01:37 UTC

Original reporter here. The bit depth options under new Custom Document are: "8 Bits", "16 Bits", and "32 Bits float". Choosing 16 Bits produces a 16 bit integer image.

Comment 5 Halla Rempt 2013-07-25 15:17:35 UTC

Okay, in that case somehow support for half is missing. I have no idea how that's possible, though...

Comment 6 Sven Langkamp 2013-07-26 12:00:11 UTC

Might also be a too old version of LCMS.

Comment 7 Halla Rempt 2013-07-26 12:07:45 UTC

That's probably it. I think that 2.6 didn't force lcms 2.4 yet.

Comment 8 jedfrechette 2013-07-26 14:59:19 UTC

Debian is still shipping lcms 2.2.

Comment 9 Adrien 2013-07-26 16:06:35 UTC

Indeed in the Changelog of lcms 2.4, I see:
- Added "half" float support

I will see if it's possible to update liblcms in Debian testing: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=701993tlc

Comment 10 Halla Rempt 2013-07-26 16:11:40 UTC

Okay, thanks for checking with us!