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Mean luminance Values of an Image

Asked by M@lik Ali

M@lik Ali

on 1 Feb 2013
Accepted Answer by Walter Roberson

Walter Roberson


I want to calculate the means luminance value of an image block

i found the formula is..

 luminance= 0.3 R + 0.59 G + 0.11 B

but how i can calculate the R, G and B values.

i know that


but it give in the shape of matrix, i think i need only a single value of R,G and B, to use above luminance formula.

please help me out.

Thanks in Advance


M@lik Ali

M@lik Ali



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1 Answer

Answer by Walter Roberson

Walter Roberson

on 1 Feb 2013
Accepted answer

provided you have the toolbox installed.

Otherwise, calculate a luminance array using the R, G, B arrays, and then mean2() the luminance array.

1 Comment

M@lik Ali

M@lik Ali

on 1 Feb 2013

nice it working, will it give me the mean luminance value of an iamge

Walter Roberson

Walter Roberson

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