An RGB Color Cube is a 3D geometric representation of the RGB (Red-Green-Blue) color space. Each axis represents one color channel: X = Red, Y = Green, Z = Blue, with values ranging from 0 to 255 (or 0.0 to 1.0). The cube's 8 vertices represent the 8 extreme color combinations — Black, Red, Green, Blue, Yellow, Cyan, Magenta, and White. Every point inside the cube corresponds to a unique RGB color, encompassing all 16.7 million colors in the standard 24-bit RGB gamut. It's widely used in computer graphics, digital imaging, and color theory education.

The 8 corner points of the RGB cube correspond to:
• Black (0, 0, 0) — origin, all channels at minimum
• Red (255, 0, 0) — pure red only
• Green (0, 255, 0) — pure green only
• Blue (0, 0, 255) — pure blue only
• Yellow (255, 255, 0) — red + green
• Cyan (0, 255, 255) — green + blue
• Magenta (255, 0, 255) — red + blue
• White (255, 255, 255) — all channels at maximum
The diagonal from Black to White contains all grayscale colors (where R=G=B).

In standard 24-bit RGB color space (8 bits per channel), there are 256 × 256 × 256 = 16,777,216 distinct colors. Each of these colors maps to a unique point inside the RGB cube. Modern displays commonly support 24-bit color (also called True Color), though higher bit depths like 30-bit (10 bits per channel, ~1.07 billion colors) are increasingly available in professional monitors and HDR content.

The RGB cube contains three main complementary color diagonals that pass through the center (middle gray):
• Red ↔ Cyan: (255,0,0) to (0,255,255) — these are complementary pairs
• Green ↔ Magenta: (0,255,0) to (255,0,255) — complementary pairs
• Blue ↔ Yellow: (0,0,255) to (255,255,0) — complementary pairs
• Black ↔ White: (0,0,0) to (255,255,255) — the grayscale axis
These diagonals help visualize how colors relate and mix within the RGB model. Complementary colors sit at opposite ends of these diagonals.

RGB (Red, Green, Blue) is an additive color model used by screens and digital displays — colors are created by adding light. HSL (Hue, Saturation, Lightness) is a cylindrical-coordinate representation of RGB, designed to be more intuitive for humans: Hue is the color type (0°–360°), Saturation is the intensity/purity, and Lightness is the brightness. CMYK (Cyan, Magenta, Yellow, Key/Black) is a subtractive color model used in printing — colors are created by subtracting light reflected from white paper using ink pigments. Each model serves different purposes: RGB for screens, HSL for color pickers, and CMYK for print production.