Changes:

• handling greyscale images is fixed;
• partial support for 16-bit (5bpc) BMP images was added;
• saving CMYKTool preferences and conversion options works now, window geometry is saved as well;
  
• embedded profiles can be ignored now, so that you can easily use fallback devicelink profiles, both RGB and CMYK;
• loading and saving CMYK JPEG was implemented;
• sorce image resolution is preserved now;
• CMYKTool now displays channel percentages under mouse cursor on top of color blobs in the bottom, plus total area ink coverage; done at the request and mockups of linuxgraphics.ru community :)
• user interface can be localized now, initial Russian translation was added.

Plans for future include spot color based dutotone creation, hiding sharp transitions between nearly grey and grey colors in Hold Grey mode, generation of devicelink profiles using Argyll and so on.

Source code | Windows build (GTK+ not included)