i want to know the pixel intensity value in an image but it gives different results using data cursor and command.which one is correct? and why it is showing differently?

let A is image

i want to know intensity value at (25,170).so by using command A(25,170) we can find intensity value but,using data cursor it shows different intensity value

Answer 1

[Alex Taylor]

Impixelinfo is reporting in x,y convention. You are indexing in row,col. Index A(y,x) and this should resolve the issue.

Answer 2

[Image Analyst]

It might use what's on the screen instead of the actual image - I don't know. Why don't you use impixelinfo(), which is meant for that sort of thing?

[Mahesh Kumar]

by using impixelinfo() shows different intensity value compare with command A(x,y).A is image name itself

[Image Analyst]

See Alex's answer. I should have thought of that. It's a very common mistake people make - using (x,y) when they should use (y,x) or using (row, column) when they should be using (column, row). Remember x = column, and y = row.