How can I find the saturation of all the rgb channels separately?

I need to find out the saturation of all the three channels separately.How do I do that?

[Walter Roberson]

I am not sure that is meaningful ?

[Prachi Sharma]

I am sorry I got it confused with something else.Actually I need to highlight those pixels in the image whose value exceeds beyond a certain threshold.How do I that?I have extracted all the three channels and now I just want to mark or highlight those pixels whose value is exceeding.

[Guillaume]

Isn't this just a duplicate of problem-in-plotting-the-matrix-over-an-image?

[Prachi Sharma]

right

Answer 1

[Image Analyst]

If you take a 3 color RGB matrix and extract out the individual color channels separately, then exactly what does saturation mean in that case - in the case of a monochrome gray scale image? Maybe you can say the intensity is the saturation? Or just call rgb2hsv() and look at the second channel for the more traditional definition of saturation, which means it operates on the whole RGB image, not the 3 color channels separately.

[Prachi Sharma]

I am sorry I got it confused with something else.Actually I need to highlight those pixels in the image whose value exceeds beyond a certain threshold.How do I that?I have extracted all the three channels and now I just want to mark or highlight those pixels whose value is exceeding.

[Image Analyst]

Do you want to change the actual pixel values, like make them red or something? OR do you want to leave the pixel values the same and just change how they are displayed, like use a colormap where those pixels are red, or use a binary overlay ?

[Prachi Sharma]

@imageanalyst..please check here https://in.mathworks.com/matlabcentral/answers/312459-problem-in-plotting-the-matrix-over-an-image