RGB color space from the first principles. Curvilinear coordinates in the color space: HSL, HSV, and Lab. Nuances of color terminology: Hue, Shade, Tone, and Tint. Conversion of images to grayscale and CMYK, gray component replacement. Color (bit) depth, HDRI.
Blending modes in Adobe Photoshop and Wolfram Mathematica, multiply and screen as a substitute for masking. Hue/Saturation adjustment, selective color editing, gamma correction. Colorizing grayscale images: working with channels, gradient maps in Wolfram Mathematica, Adobe Photoshop, and After Effects. Color decomposition, combination with frequency (wavelet) decomposition, application in retouching.