Replacing pixel value a another colour

FIR
2012 12 6
1 个回答
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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

0 个投票

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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FIR
FIR 2012-12-6
Sir its onlt colour images ,i need to clarify two more questions to complete tis work,hope you will guide me,first of all thanks for ur answer above.
I have a image say any colour image ,
I=imread('');
m=mean(I(:));finding mean
now i have to give 3 color options,RED,Yellow,(Brown or any colour);
if the value of my mean lies from 0 to 80
i need to RED COLOUR TO THAT IMAGE
IF mean value is from 80 to 150,i want to specifi the image with YELLOW
IF more than 150 i want to specify with
Brown or any colour
please assist
Image Analyst
Image Analyst 2012-12-6
Seem like a weird thing to do, but you can just use the code I already gave, along with an if statement
if m < 80
rgbImage(:, :, 1) = 255;
rgbImage(:, :, 2) = 0;
rgbImage(:, :, 3) = 0;
else if m <= 150
rgbImage(:, :, 1) = 255;
rgbImage(:, :, 2) = 255;
rgbImage(row, column, 3) = 0;
else
rgbImage(:, :, 1) = 77;
rgbImage(:, :, 2) = 77;
rgbImage(:, :, 3) = 0;
end
FIR
FIR 2012-12-6
Sir can i get anything like this
http://imgur.com/MjKvo because,the above code makes whole image in colour,cant see what is in the image
Image Analyst
Image Analyst 2012-12-6
Yes, but you didn't say what the recipe was for getting that. You just took the mean of all red, all green, and all blue pixels all lumped together and then wanted the the image - the whole image presumably - to be either red, yellow, or brown based on what that mean was. That's what you asked me to do for 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.
FIR
FIR 2012-12-7
Sir the problem is, the whole image becomes red or other color depending upon mean.i cannot see what objects are present in image.is it possible to see the objects in image after making the block any colour
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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FIR
FIR
2012-12-6

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