masking some desired portion of an image

how do i mask a portion of a rgb(tif) and a gray img with an available gif mask(0 and 255)?I am in urgent need, please answer.Thnx in advance

[Walter Roberson]

http://www.mathworks.com/matlabcentral/answers/29922-why-your-question-is-not-urgent-or-an-emergency

Answer 1

[Image Analyst]

One way:

% Mask the image.
maskedRgbImage = bsxfun(@times, rgbImage, cast(mask,class(rgbImage)));