[bug #58835] Floating point errors when comparing pixel scale in Crop

[Mohammad Akhlaghi]

URL:
  <https://savannah.gnu.org/bugs/?58835>

                 Summary: Floating point errors when comparing pixel scale in
Crop
                 Project: GNU Astronomy Utilities
            Submitted by: makhlaghi
            Submitted on: Mon 27 Jul 2020 10:36:46 AM BST
                Category: Crop
                Severity: 3 - Normal
              Item Group: Crash
                  Status: In Progress
                 Privacy: Public
             Assigned to: makhlaghi
             Open/Closed: Open
         Discussion Lock: Any

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Details:

In WCS mode, Crop can take multiple images and stitch them together. To do
this, it needs to make sure that all images have the same pixel scale. But it
uses a simple equality check to see if the pixel scales are the same. 

Joanna Sakowska reported that floating point errors can create problems in
this check, causing a crash in Crop.




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