How do I find the X and Y coordinates of a particular pixel in an image?

I want to perform some transformations on the pixel coordinates.

Answer 1

[Rajiv Ghosh-Roy]

If you want to do it interactively (e.g. with a mouse), use the function ginput.

[NANDITA Joshi]

I don't want to do it with a mouse. I need to use that value later in the program.

[Rajiv Ghosh-Roy]

In that case, how would you determine which one the "particular pixel" is? Are the coordinates just the position within the image, or are there other coordinates you are trying to correlate to?