Hi Niloofar,

there are several ways to convert an RGB color image. The most straightforward one is to use the built-in Matlab function rgb2gray as:

> Ig = rgb2gray(Irgb);

Ig is your grayscale image, which is close to the luminace component of your RGB image. I'm not sure if you need to have the Image Processing Toolbox installed or not. If can't use it, you can easily generate it by averaging R,G and B channel, as:

> Ig = (Irgb(:, :, 1) + Irgb(:, :, 2) + Irgb(:, :, 2) )./3

There are also other techniques, but I think that they are a bit out of the scope of your question. If you are interested, please let me know.

Sincerely,

Pasquale

Hi Pasquale,

thank you for your answer but Is there any way that i will find these codes such as color2gray or Rasche et al codes?

You could try to contact directly the author by email, and ask for the source code if it is freely available. Or, maybe you can try on Matlab File Exchange web page or online repository such as GitHub, checking copy-right permission.

Regards,

Pasquale

I greatly appreciate your guidance .Your advice is really helpful.

hi , you can use “rgb2gray” function , it will convert your rgb picture to grayscale one.you can also define a funcrion that takes mean of rgb picture’s matrix layers

Dear Niloofar

This would help you 👌🏻

https://www.mathworks.com/help/matlab/ref/rgb2gray.html