[Octave-bug-tracker] [bug #30715] imread fails to read uint16 tif image

[anonymous]

Follow-up Comment #8, bug #30715 (project octave):

Here's a test for the quantum depth.
#include <GraphicsMagick/wand/magick_wand.h>
#include <iostream>
using std::cout;
using std::endl;

int main ()
{
        unsigned long depth = 0;
        MagickGetQuantumDepth(&depth);
        cout << depth << endl;
        return depth;
}

g++ -Wall -pedantic gm_ver.cc -I/usr/include/GraphicsMagick -L/usr/lib
-lGraphicsMagickWand -o gm_ver

I think a couple small changes to __magick_read__.cc can be used to add
support for 16 bit images if it's available and give a friendlier error if
not. GraphicsMagick can support a QuantumDepth of 32 bits so perhaps a case
for 32 bit images should be added too. 

#if (QuantumDepth > 8)
    case 16:
        ...
        break;
#endif
#if (QuantumDepth > 16)
    case 32:
        ...
        break;
#endif
    default:
    error ("__magic_read__: index depths bigger than %d-bit not supported",
Qu

-----
Jonathan Thomson

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