bugGNU Astronomy Utilities - Bugs: bug #53362, Can't use max 8-bit value in...


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

Submitter:  Mohammad Akhlaghi <makhlaghi>
Submitted:  Fri 16 Mar 2018 05:23:59 PM UTC
Category:  Arithmetic Severity:  3 - Normal
Item Group:  Output not reasonable Status:  Postponed
Privacy:  Public Assigned to:  None
Open/Closed:  Open

Fri 16 Mar 2018 05:23:59 PM UTC, original submission:  

The maximum of the 8-bit (or any other unsigned integer type) or the minimum of the signed integer types cannot be used in Arithmetic because Gnuastro defines them as blank values.

But in some contexts, these values may be meaningful (for example if you want to invert the pixels in an 8-bit image, you want to calculate 255 - p). Therefore, currently such operations are not possible with Arithmetic (the output will be completely blank).

To fix this, we need to add an option to Arithmetic so for integer types, it can ignore the blank values (and just treat them as a number).

Mohammad Akhlaghi <makhlaghi>
Group administrator


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