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Coloring pixels with a specific color

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Alberto Acri
Alberto Acri am 24 Jan. 2023
Kommentiert: Image Analyst am 26 Jan. 2023
Is it possible to create an image (like the original) in which only the desired pixels are colored?
For example, I want to color white only the pixels with the numbers 25 to 27 (present inside 'grayLevel'). Any ideas?
rgb = imread('example.jpg');
%% Matrix of pixels
Number_Of_Rows = height(rgb);
Number_Of_Columns = width(rgb);
grayLevel = zeros(Number_Of_Rows,Number_Of_Columns);
for Row = 1:Number_Of_Rows
for Column = 1:Number_Of_Columns
grayLevel(Row,Column) = rgb(Row, Column);

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Image Analyst
Image Analyst am 24 Jan. 2023
You need to somehow get the gray scale image from the RGB image though, maybe like
grayImage = rgb2gray(rgbImage);
Then you can use imoverlay
mask = (grayImage >= 25) & (grayImage <= 27);
rgbImage = imoverlay(grayImage, mask, 'Color', 'w');
  8 Kommentare
Alberto Acri
Alberto Acri am 26 Jan. 2023
And how can I visualize them? Using for example 'imoverlay'?
Image Analyst
Image Analyst am 26 Jan. 2023
No, if you have a gray scale image and you just want white, not a "color", then you don't need imoverlay. You can just use imshow:
imshow(grayImage, []);

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