[Octave-bug-tracker] [bug #49941] image package: rgb2gray of a single image produces a double image

[Avinoam Kalma]

URL:
  <http://savannah.gnu.org/bugs/?49941>

                 Summary: image package: rgb2gray of a single image produces a
double image
                 Project: GNU Octave
            Submitted by: avinoam
            Submitted on: Tue 27 Dec 2016 08:45:36 PM GMT
                Category: Octave Forge Package
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Matlab Compatibility
                  Status: None
             Assigned to: carandraug
         Originator Name: Avinoam
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: other
        Operating System: Any

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Details:

rgb2gray of a single image produces a double image, while in
MATLAB the result is single.

The fix is very simple: instead of


    case {"single", "double"}
      ## do nothing. All is good


There should be:


    case "single"
      im = single(im);
    case "double"
      ## do nothing. All is good


A BIST:


assert (isequal(class(rgb2gray(ones(3,3,3,'single'))),'single'))







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