separate colors of image

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PK
PK 2016-10-8
评论： PK 2016-10-8
I want to extract red part and green part of attached image. I want to extract Red part is to one image and green part is to next image. Please help me.

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Guillaume
Guillaume 2016-10-8
Have you tried using the Color thresholder app?
I wouldn't perform the separation in RGB. HSV or Lab are probably more suitable.
I get reasonable results with:
img = imread('three_rose.jpg');
hsvimg = rgb2hsv(img);
huemin = 0.03; huemax = 0.945;
huemask = hsvimg(:, :, 1) < 0.03 | hsvimg(:, :, 1) > 0.945; %filter on hue
roses = hsvimg;
roses(repmat(~humask, [1 1 3]) = 0; %set anything not red to black
imshow(hsv2rgb(roses)) %display after converting back to rgb

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Massimo Zanetti
Massimo Zanetti 2016-10-8
Here is an example with a default matlab image to extract color bands:
IMG=imread('peppers.png');
RED=IMG(:,:,1);
GREEN=IMG(:,:,2);
BLUE=IMG(:,:,3);
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