[Octave-bug-tracker] [bug #40267] imread ('default.img') causes segfault

[Carnë Draug]

Follow-up Comment #5, bug #40267 (project octave):

By the way, I generated the PNG image with the following:


[old_img, old_map] = imread ("default.img");

new_map = zeros (numel (unique (old_img(:))), 3);
new_img = zeros (size (old_img), "uint8");

n = 0;
for row = 1:rows(old_map)
  mask = old_img == row;
  if (any (mask(:)))
    new_img(mask) = n++;
    new_map(n,:)  = old_map(row, :);
  endif
endfor
imwrite (new_img, new_map, "new-default.img")


This code also converts the indexed image to uint8 (there's only 56 entries)
and removes unnecessary entries from the colormap. After, I ran pngcrush which
further reduced the size of the png file.

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