[Octave-bug-tracker] [bug #41673] imwrite creates bad jpeg grayscale images

[Ilya Kurdyukov]

Follow-up Comment #4, bug #41673 (project octave):


at "libinterp/dldfcn/__magick_read__.cc"

No wonder that image is red:

                for (octave_idx_type row = 0; row < nRows; row++)
                  {
                    Magick::Color c;
                    c.redQuantum (double (*img_fvec) / divisor);
                    pix[GM_idx] = c;

Fix:

                for (octave_idx_type row = 0; row < nRows; row++)
                  {
                    double grey = double (*img_fvec) / divisor;
                    Magick::Color c (grey, grey, grey);
                    pix[GM_idx] = c;

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