Find the Euclidean distance of each pixel from a user-selected pixel in color space and displays scaled images from 0 to the current max distance.

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Hi,
Can someone help me? Sorry for bad english
I need to find the Euclidean distance of each pixel from a user-selected pixel in RGB space and other in Lab space. Then displays 2 scaled images either from 0 to the current max distance, or from 0 to the theoretically maximum possible distance in a given color space. The result should be like
I'm new to this
Here is my current code
I dont know if im on the right way
Thanks everyone
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KALYAN ACHARJYA
KALYAN ACHARJYA on 23 Jan 2021
Edited: KALYAN ACHARJYA on 23 Jan 2021
"I need to calculate the Euclidean distance between pixel colors, not between their coordinates"
Distance measure between to positions/locations, the indices (row number and column number) of particular color level exactly represent the same.

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Accepted Answer

Image Analyst
Image Analyst on 23 Jan 2021
Just do this
[x, y] = ginput(1);
row = round(y);
col = round(x);
rp = double(rgbImage(row, col, 1));
gp = double(rgbImage(row, col, 2));
bp = double(rgbImage(row, col, 3));
[r, g, b] = imsplit(double(rgbImage));
colorDistance = sqrt((r - rp).^2 + (g - gp).^2 + (b - bp).^2);
imshow(colorDistance, []);
See attached demo for Delta E demos. Delta E is the coor distance in LAB color space.
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