How could I mark other than Blue Pixels in this image?

Hello,

I would like to mark other than blue pixels.

Later I will compare these pixels with the other image pixel values. Is there anyone helping on this issue?

[Walter Roberson]

Define "blue" for your purposes. Is (93, 138, 168) blue? It is for legal purposes -- it is "Air Force Blue".

[Murat Kocaman]

Yes I did. My problem is on marking. I couldn't mark them.

Answer 1

[Walter Roberson]

[R, C] = find(~MaskIndicatingWhichPixelsAreBlue);
image(YourRGBImage);
hold on
markersize = 8;
scatter(C(:), R(:), markersize, 'r*');
hold off

[Walter Roberson]

I just added a small correction to mark the pixels that are not blue.