How can I paint a list of pixels in a matlab image?

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Wanderson
Wanderson 2012-1-16
I'm working with a lot of images here and I have to find all the pixels above a scalar value and paint all them into any color.
I've all the indexes of this pixels but I don't know how can I paint them now...
Thx for the help again.
  1 个评论
Jan
Jan 2012-1-16
In which format are the "images" represented? Printed on paper, as JPEGs on the harddisk or as arrays in Matlab? What does "paint all of them in any color" exactly mean?

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采纳的回答

Image Analyst
Image Analyst 2012-1-16
Here's the way to do it without using slow loops:
grayImage = imread('coins.png');
subplot(2,2,1);
imshow(grayImage);
binaryImage = uint8(255 * ~(grayImage > 150));
subplot(2,2,2);
imshow(binaryImage, []);
uniformImage = uint8(255 * ones(size(grayImage)));
zeroImage = uint8(255 * zeros(size(grayImage)));
rgbImage = cat(3, uniformImage, binaryImage, zeroImage);
subplot(2,2,3);
imshow(rgbImage);

更多回答（2 个）

Wanderson
Wanderson 2012-1-16
LoL, sorry I'll try to explain it better now.
I have one image 320x256 as arrays in matlab. I use the function "find" to find all the pixels between 0 and 0.5 and I have to paint this set of pixel from "yellow" for example and them I'll do the same thing to find another set of pixel between 0.5 and 1.0 and paint this new set to "red".
better now?
Wanderson
Wanderson 2012-1-17
Thank you both for the help.

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