New version 2.8.15 released.

Changelog

• Added: tolerance and CMYK value in the "Pixel color/Replace color" dialog;
• Added: new commands to show/swap/invert the color channels of the image(s);
• Added: new command to reopen the displayed image file;
• Added: new command to set a background image for the displayed image;
• Added: new "Always on top" option for the main window;
• Added: Ctrl+Shift+RMB to show the "Tools" menu (useful for the fullscreen mode);
• Added: Xcursor codec (read/write and multi-format/animation are supported);
• Added: QOI codec (read/write);
• Added: DDS decoder;
• Some cosmetic changes.
• Code optimizations and minor bug fixes.