[bug #53362] Can't use max 8-bit value in Arithmetic

[Mohammad Akhlaghi]

Follow-up Comment #1, bug #53362 (group gnuastro):

Until this bug is fixed, you can use the following command to take the 8-bit
image (assumed it is called 'uint8.fits') to a larger integer width type, and
convert the NaN/blanks to 255. All the operations and programs will work as
expected on the output 'uint16.fits' file.


astarithmetic uint8.fits uint16 set-i i i isblank 255 where \
              --output=uint16.fits




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