Brushes not working with new lcms2 2.10 installed
GIMP depends on lcms2 program for color management (at least in linux). New version (2.10) was out few days ago and I had GIMP seg-faulting. Luckily, I managed to report it to dev of lcms2 and he found 2 bugs based on stack traces. While GIMP is now working properly, I run into another problem.
While GIMP is not crashing anymore, now painbrushes, airbrushes and pencils don't work on images when color correction is on. They simply don't paint anything. When color correction is turned off they work.
The issue is more complicated than this:
TIFF 16/32bit files, having other than Gimp's native sRGB do not have working painbrushes while color correction is on.
JPG files converted to 16/32bit while having RTv4_sRGB profile do not have working painbrushes while color correction is on.
TIFF files having 16b/32bit floating point WORK.
TIFF 16/32bit files having converted profiles to GIMP's sRGB WORK.
TIFF 8bit files WORK
JPG 8bit files WORK.
Reverting back to lcms2 2.9 and all is normal
I contacted him again, but this time he suggested to contact you (gimp devs) for further help or assistance on this.
Here's his reply "Sorry to hear that. Maybe it is some wrong alpha value going to the color engine? The behavior you report is weird. I am not a gimp expert, I don't even have a true linux... I think we need help from gimp folks for this."
Indeed I think we do - what do GIMP devs suggest? What can I do to help?