thirty-color image

Quick answer：

A thirty-color image refers to an image that is composed of thirty distinct colors. In digital image processing, color is typically represented using a color model, such as RGB (Red, Green, Blue), where each color channel can have a range of values. The number of colors in an image can affect its quality and the amount of memory it requires. In the context of photography, printing, or graphic design, the choice of color palette can significantly impact the visual appeal of the image.