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[gnuastro-devel] [bug #55298] Arithmetic reading 255 on command-line as


From: Mohammad Akhlaghi
Subject: [gnuastro-devel] [bug #55298] Arithmetic reading 255 on command-line as blank
Date: Thu, 27 Dec 2018 12:14:49 -0500 (EST)
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:64.0) Gecko/20100101 Firefox/64.0

URL:
  <https://savannah.gnu.org/bugs/?55298>

                 Summary: Arithmetic reading 255 on command-line as blank
                 Project: GNU Astronomy Utilities
            Submitted by: makhlaghi
            Submitted on: Thu 27 Dec 2018 05:14:48 PM UTC
                Category: Arithmetic
                Severity: 3 - Normal
              Item Group: Output not reasonable
                  Status: In Progress
                 Privacy: Public
             Assigned to: makhlaghi
             Open/Closed: Open
         Discussion Lock: Any

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Details:

When you want to select pixels with a label of 255 (for example on
NoiseChisel's output) with Arithmetic, it doesn't select them. This is because
255 fits into an unsigned 8-bit value, so it is stored with that type. But
being the maximum value, 255 is also the value used for blank in this type. 

So when the user gives 255 to Arithmetic (and in particular the library's
`gal_type_string_to_number' function, it should be defined as belonging to one
larger type.




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Reply to this item at:

  <https://savannah.gnu.org/bugs/?55298>

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