WHY I GET NAN FROM "IMPIXCEL"

I want to read an image and get color of pixells but the result from "impixel" for some pixels is NAN why" please help me

[Matt J]

Maybe some of the pixels in your image are NaN...? How can we know?

[mandana]

pixels that are nan sounds like what? how can i recognize them?

[mandana]

thanks alot

Answer 1

[Walter Roberson]

If you specified row and column numbers to impixel() and they were outside of the image, then you would get NaN returned.

Watch out that impixel expects column (x coordinate) to be passed in before row (y coordinate)

[mandana]

thanks alot