Image Processing Toolbox™

isgray - True for grayscale image

Syntax

flag = isgray(A)

Note This function is obsolete and may be removed in future versions.

flag = isgray(A) returns 1 if A is a grayscale intensity image and 0 otherwise.

isgray uses these criteria to decide whether A is an intensity image:

If A is of class double, all values must be in the range [0,1], and the number of dimensions of A must be 2.
If A is of class uint16 or uint8, the number of dimensions of A must be 2.

Note A four-dimensional array that contains multiple grayscale images returns 0, not 1.

The input image A can be of class logical, uint8, uint16, or double.