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how can i calculate and display the particular range of pixels in the image?

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ABDUL WAHID MOHAMMED
评论： Image Analyst 2017-4-1
My main task is to highlight the particular pixel value by changing the color of that pixel. For example; we have a color image. I want to highlight a particular color in the image with the help of range of pixels.Can i have a code for this please.

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Image Analyst
Image Analyst 2017-3-17
Set up a colormap and apply it. For example (untested)
grayImage = imread('cameraman.tif');
imshow(grayImage);
cmap = gray(256);
% Make gray levels 150 - 170 red
cmap(151:191, 1) = 1;
cmap(151:191, 2) = 0;
cmap(151:191, 3) = 0;
colormap(gca, cmap);
colorbar;
hp = impixelinfo();
  2 个评论
ABDUL WAHID MOHAMMED
ABDUL WAHID MOHAMMED 2017-4-1
I can change the selected range of pixels in the image to red.How can i count the area or the count of the 'red color'(the range changed)?
Image Analyst
Image Analyst 2017-4-1
In the above example where you were interested in the range 150-170, and pseudocolored those pixels to red (in the display only, NOT by changing the original image values) by using a colormap, you can use imhist() and sum up those bins
[counts, grayLevels) = imhist(grayImage);
numPixels = sum(counts(151:171))

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