Replacing pixel value a another colour

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FIR
FIR 2012-12-6
I have a image in that suppose i want to change the pixel colour ,how i can do it.assume i have peppers image,in that if i want to replace a pixel value say 5 by yellow colour or some other colour,please tell how to proceed
please asist

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回答（1 个）

Image Analyst
Image Analyst 2012-12-6
5 in which color channel and which color space? In general it's
rgbImage(row, column, 1) = 255;
rgbImage(row, column, 2) = 255;
rgbImage(row, column, 3) = 0;
for yellow (though I suspect you knew this already). If you have a mask (a binary image of where the 5's occur), it's somewhat different.
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Image Analyst
Image Analyst 2012-12-7
Yes. Like I said, that's what you asked for. We can do something different. Recall that I said to you: " If you want something different than that you need to say specifically what it is. It would be best if you made a shot at some code to explain it also." So, how did you get that image? If you can't give code, then at least describe the method in words.
FIR
FIR 2012-12-8
Yes i got that image that image using
my code is
rgbBlock=imread('peppers.png')
cform = makecform('srgb2lab');
lab = applycform(rgbBlock, cform);
L_channel = lab(:,:,1);
A_channel = lab(:,:,2);
B_channel = lab(:,:,3);
L_channelNew = 100 - L_channel;
A_channelNew = 255-A_channel;
labNew = cat(3, L_channelNew, A_channelNew, B_channel);
cform2 = makecform('lab2srgb');
rgbNew = applycform(labNew,cform2);
imshow(rgbNew)
i have attached a image below is it possible to give different colour for different objects
http://www.sendspace.com/file/f11rpy
in this
i want to give different colour for fifferent objects ,say for green one colour ,brown one colour,others another colur,i tried with above code,but did not get actual result
plz assist

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