Image Processing Toolbox

Summary of Image Types and Numeric Classes

This table summarizes the way MATLAB interprets data matrix elements as pixel colors, depending on the image type and storage class.

Image Type	Storage Class	Interpretation
Binary	logical	Array of zeros (0) and ones (1)
Indexed1	double	Array of integers in the range [1, p]
	uint8 or uint16	Array of integers in the range [0, p-1]
Intensity1	double	Array of floating-point values. The typical range of values is [0, 1].
	uint8 or uint16	Array of integers. The typical range of values is [0, 255] or [0, 65535].
RGB (Truecolor)	double	m-by-n-by-3 array of floating-point values in the range [0, 1].
	uint8 or uint16	m-by-n-by-3 array of integers in the range [0, 255] or [0, 65535].

1. The associated colormap is a p-by-3 array of floating-point values in the range [0, 1]. For intensity images the colormap is typically grayscale.

Multiframe Image Arrays

Converting Image Types