12. Images and color

Canvas size. Pick it in the main panel. Changing the size resamples the existing canvases and relinks them (the resize backup button appears while the old size is available).

Image defaults. Set format, bit depth, colour space and alpha mode in OP Settings. Mask canvases use EXR for float or TIFF for 8-bit. Image-bus channels have their own defaults, see the settings chapter.

Per-image controls. The Node Inspector lets you change colour space, sampling and mapping. These are Blender's image settings, so use the ones your textures need (usually sRGB for colour, Non-Color for data maps). Global defaults are in Image Settings (Global).

OP saves your active canvas after 30 seconds idle, and all canvases when you save the .blend. See chapter 15 for recovery stuff.