24-color image

Quick answer：

A 24-color image refers to an image that utilizes a palette of 24 distinct colors. In digital image processing, an image's color palette determines the range of colors it can display. A 24-color palette is relatively limited compared to higher color depths like 256-color or true color (24-bit). The 24 colors can be chosen from a wide spectrum of hues, but the specific colors will depend on the color model used (e.g., RGB, CMYK) and the image's color space.