Consider i have an image 'abc.jpeg' which is a RGB image how do i convert it to Grayscale without rgb2gray() func????

can someone give the manual code

Answer 1

[Nick Counts]

You can see how TMW does it with

open rgb2gray

The entire function is available for you to read.

Also, there are many color map manipulation tools available. See the documentation for

colormap
gray <- This one especially

That should point you in the right direction. (There is example code in the help for these functions)

If you need to literally do the math yourself, it boils down to matrix manipulation. You could brute force it by adding the R, G, and B matrices together and dividing by 3. That would give you some approximation of a brightness matrix, which is essentially the image in grayscale.

You can experiment with how you weight each color channel to get different results (kind of like using filters with black and white film).

Good luck!

[Sahithi N]

Thank you so much Nick!!!