rgb2gray not in bw

When I use rgb2gray on a jpg file it becomes red with some yellow, blue and green.
what am I doing wrong?

Answers (1)

Do whos on it and tell us what it says:
whos yourGrayImage
If it says it's a 2D uint8 image, then perhaps you have some kind of colormap applied. Issue the "colorbar" command to check.

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on 20 May 2013

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