Introduction (Image Processing Toolbox)

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
Class double
Class uint8 or uint16

Binary

Image is an m-by-n array of integers in the range [0,1] where the logical flag is on.
Image is an m-by-n array of integers in the range [0,1] where the logical flag is on.

Indexed
Image is an m-by-n array of integers in the range
[1, p].
Colormap is a p-by-3 array of floating-point values in the range [0, 1].
Image is an m-by-n array of integers in the range
[0, p - 1].
Colormap is a p-by-3 array of floating-point values in the range [0, 1].

Intensity
Image is an m-by-n array of floating-point values that are linearly scaled by MATLAB to produce colormap indices. The typical range of values is [0, 1].
Colormap is a p-by-3 array of floating-point values in the range [0, 1] and is typically grayscale.
Image is an m-by-n array of integers that are linearly scaled by MATLAB to produce colormap indices. The typical range of values is [0, 255] or [0, 65535].
Colormap is a p-by-3 array of floating-point values in the range [0, 1] and is typically grayscale.

RGB (Truecolor)
Image is an m-by-n-by-3 array of floating-point values in the range [0, 1].
Image is an m-by-n-by-3 array of integers in the range [0, 255] or [0, 65535].

Image Type	Class double	Class uint8 or uint16
Binary	Image is an m-by-n array of integers in the range [0,1] where the logical flag is on.	Image is an m-by-n array of integers in the range [0,1] where the logical flag is on.
Indexed	Image is an m-by-n array of integers in the range [1, p]. Colormap is a p-by-3 array of floating-point values in the range [0, 1].	Image is an m-by-n array of integers in the range [0, p - 1]. Colormap is a p-by-3 array of floating-point values in the range [0, 1].
Intensity	Image is an m-by-n array of floating-point values that are linearly scaled by MATLAB to produce colormap indices. The typical range of values is [0, 1]. Colormap is a p-by-3 array of floating-point values in the range [0, 1] and is typically grayscale.	Image is an m-by-n array of integers that are linearly scaled by MATLAB to produce colormap indices. The typical range of values is [0, 255] or [0, 65535]. Colormap is a p-by-3 array of floating-point values in the range [0, 1] and is typically grayscale.
RGB (Truecolor)	Image is an m-by-n-by-3 array of floating-point values in the range [0, 1].	Image is an m-by-n-by-3 array of integers in the range [0, 255] or [0, 65535].

Multiframe Image Arrays Working with Image Data