How To remove black color from gray-scale image?

Hi guys

i was wondering how can i remove a black color from the grayscale image? or can i just change the black into any other lighter color?

thank you

Answer 1

[Jan]

It depends on the format of the image. For a UINT8 array:

Img = randi([0,255], 100, 100, 'uint8');  % Test data
Img(Img == 0) = 127;

Now black is replaced by a medium grey. The procedure for double format is equivalent, but a medium grey is 0.5.

[Lu Yaseen]

Thanks a lot this is exactly what i was looking for :)!