Legacy ImageMagick Discussions Archive

We tried your command on our system with ImageMagick 6.9.4-8 beta and it worked properly. Can you download http://magick.imagemagick.org/download/beta/ImageMagick-6.9.4-8.tar.bz2 and let us know if you still experience the problem. 6.9.4-8 beta has the same problem for me. If so, report back here ...

$ convert -version Version: ImageMagick 6.9.4-7 Q16 amd64 2016-06-06 http://www.imagemagick.org Copyright: Copyright (C) 1999-2016 ImageMagick Studio LLC License: http://www.imagemagick.org/script/license.php Features: Cipher DPC HDRI OpenMP Delegates (built-in): bzlib cairo fftw fontconfig fpx ...

It works (with a little patch). Thanks a lot! --- magick/composite.c.orig 2015-04-21 12:23:35.000000000 +0000 +++ magick/composite.c 2015-04-22 18:10:30.714484466 +0000 @@ -2860,9 +2860,9 @@ ClampPixel(composite.red) : ClampToQuantum(composite.red)); SetPixelGreen(q,clamp != MagickFalse ? ClampPixel ...

ImageMagick-6.9.1-1 has the same problem.

Well. Standard is standard. But clamping makes HDRI processing difficult. May be worth to add "-define compose:clamping=(true|false)" (or something else) to control this behavior?

static inline Quantum ClampPixel(const MagickRealType value) { if (value < 0.0f) return(0); if (value >= (MagickRealType) QuantumRange) return((Quantum) QuantumRange); #if !defined(MAGICKCORE_HDRI_SUPPORT) return((Quantum) (value+0.5f)); #else return((Quantum) value); #endif } static inline Quantum ...

2985 if (photometric == PHOTOMETRIC_RGB) 2986 (void) TransformImageColorspace(image,sRGBColorspace); What does this code? As a result, embedded profile will be lost when writing RGB image. Also embedding profile by '-profile' command into RGB images doesn't work: $ convert test.tiff -profile /path ...

More complex patch (to 6.8.6-7): --- coders/tiff.c.orig 2013-07-24 17:25:21.000000000 +0000 +++ coders/tiff.c 2013-07-25 10:58:06.812011876 +0000 @@ -3178,18 +3178,24 @@ (void) TIFFSetField(tiff,TIFFTAG_RESOLUTIONUNIT,(uint16) units); (void) TIFFSetField(tiff,TIFFTAG_XRESOLUTION,image->x_resolution ...

This looks like a bug in the "coders/tiff.c". Quick and dirty patch is: --- coders/tiff.c.orig 2013-06-30 17:44:02.000000000 +0000 +++ coders/tiff.c 2013-07-24 12:43:54.333966829 +0000 @@ -3176,7 +3176,7 @@ (void) TIFFSetField(tiff,TIFFTAG_RESOLUTIONUNIT,(uint16) units); (void) TIFFSetField(tiff ...

When saving a TIFF both horizontal and vertical page offsets are lost when any of them (horizontal or vertical) <= 0: $ sf=tif; sz=16x16; for x in -16 +0 +16; do for y in -16 +0 +16; do convert -size $sz -page $sz$x$y -depth 8 -units PixelsPerInch -density 300 xc:gray50 $sz$x$y.$sf; identify -format ...