setpix
Examples

1. Set a specific pixel to a value

Set the pixel at (100,100) in test.fits to zero and write out the new file to teste.fits

setpix -n 100 100 0 test.fits

2. Set a row to a value

Set row 100 of test.fits to zero

setpix 0 100 0 test.fits

3. Set a square region to a value

Set a 10 by 10 box in test.fits to zero

setpix 51-60 51-60 0 test.fits

4. Set several regions in several files to a specific value

Use the file newval to change test.fits and test1.fits.

setpix @newval test.fits test1.fits

where newval contains

1 1 0
2 2 0
3 3 0
4 4 0
5-10 5-10 0