How can i color the pixels in red?

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Pamela Paolo
Pamela Paolo 2012-12-5
Hi, for an image I, I want to color in red the pixels having the coordinates x and y stored in the matrix xy
[L C]=size(I);
xy=[x y];
thanks in advance
  1 个评论
Walter Roberson
Walter Roberson 2012-12-5
What kind of image is it? RGB or pseudocolor? If it is pseudocolor is it acceptable that it be converted to RGB using the current colormap ?

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回答（1 个）

Image Analyst
Image Analyst 2012-12-5
Try this, assuming you want to set pixels in an RGB image to red.
for k = 1 : length(xy)
row = int32(xy(k,1));
col = int32(xy(k,2));
rgbImage(row, col, 1) = 255;
rgbImage(row, col, 2) = 0;
rgbImage(row, col, 3) = 0;
end
If you have a monochrome image, you'll first have to convert it to an rgb image:
rgbImage = cat(3, grayImage, grayImage, grayImage);
% After that, then it's the same loop as above.
for k = 1 : length(xy)
row = int32(xy(k,1));
col = int32(xy(k,2));
rgbImage(row, col, 1) = 255;
rgbImage(row, col, 2) = 0;
rgbImage(row, col, 3) = 0;
end

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