[Octave-bug-tracker] [bug #58125] rgb2gray causes high cpu and will run forever without any errors

[Eli Chan]

Follow-up Comment #5, bug #58125 (project octave):

if I use a ridiculously small png file, it will work.
the shape of img is: 64x48x3

Anything larger than that will stuck at  I = rgb * xform;


octave:2> dbstop rgb2gray
ans =  45
octave:3> img_gray=rgb2gray(img)
stopped in /usr/local/share/octave/5.2.0/m/image/rgb2gray.m at line 45
45:   if (nargin != 1)
debug> dbstep
stopped in /usr/local/share/octave/5.2.0/m/image/rgb2gray.m at line 49
49:   is_int = isinteger (rgb);
debug> dbstep
stopped in /usr/local/share/octave/5.2.0/m/image/rgb2gray.m at line 50
50:   if (is_int)
debug> dbstep
stopped in /usr/local/share/octave/5.2.0/m/image/rgb2gray.m at line 51
51:     cls = class (rgb);
debug> dbstep
stopped in /usr/local/share/octave/5.2.0/m/image/rgb2gray.m at line 54
54:     = colorspace_conversion_input_check ("rgb2gray", "RGB", rgb);
debug> dbstep
stopped in /usr/local/share/octave/5.2.0/m/image/rgb2gray.m at line 58
58:   xform = [0.298936; 0.587043; 0.114021];
debug> dbstep
stopped in /usr/local/share/octave/5.2.0/m/image/rgb2gray.m at line 59
59:   I = rgb * xform;
debug> dbstep
stopped in /usr/local/share/octave/5.2.0/m/image/rgb2gray.m at line 61
61:   sz(3) = 1; # grayscale images have 3rd dimension of length 1


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