Legacy ImageMagick Discussions Archive

I have a similar problem, if I try to write tiff files after performin a rotation with the original file. It happens if the original file is a png file or a tiff file. rose@moose:/home/rose(405)$ convert -rotate 10 OrigImages/lena.png OutImages/lena.tiff convert: tif_dirwrite.c:2084 ...

BTW, can anybody give me a hint, which algorithms is used, that some pixel values become negative or larger than the former maximal value (255)?

If I rotate an image I get values for image depth, minimum and maximum, which I does not expect. I use the following rotate-image_with_getChannelRange.c program: #include <stdio.h> #include <stdlib.h> #include <wand/MagickWand.h> print_stat(MagickWand *wand, long long unsigned max_img_val, long long ...

The result is now: rose@moose:/home_moose/rose/Txt/src/Test/C/ImageMagick/Wand(268)$ ./getChannelRange lena.png IM_quantum_depth_str=|Q32| IM_quantum_depth=|32| img_depth=8 quantum_format=|(null)| RedChannel=1 GreenChannel=2 BlueChannel=4 after 'GetImageChannelRange(,RedChannel,) ' minimum= 38.0(0 ...

I assume, that I found the solution: #include <stdio.h> #include <stdlib.h> #include <wand/MagickWand.h> int main(int argc,char **argv) { #define ThrowWandException(wand) { \ description=MagickGetException(wand,&severity);\ (void) fprintf(stderr,"%s %s %lu %s\n",GetMagickModule(),description ...

With 'identify -verbose file' I can show minmal and maximal pixel values, e.g. rose@moose:/home_moose/rose/Txt/src/Test/C/ImageMagick/Wand(203)$ identify -verbose lena.png ... Colorspace: RGB Depth: 8-bit Channel depth: red: 8-bit green: 8-bit blue: 8-bit Channel statistics: Red: min: 38 (0.14902 ...

I repeated the test with ImageMagick 6.7.4-0: rose@moose:/home_moose/rose/Txt/projects/MicroElectrodes/Test/GetOneAuthenticPixel_versus_MagickExportImagePixels(741)$ identify -version Version: ImageMagick 6.7.4-0 2011-12-12 Q32 http://www.imagemagick.org Copyright: Copyright (C) 1999-2011 ...

But what about the main problem the identification of quantum:format?

It seems that const char *option=GetImageOption(image_info,"quantum:format"); does not work for me. I use the following source: #include <stdio.h> #include <string.h> #include <magick/MagickCore.h> int main (int argc, char *argv[]) { MagickCoreGenesis(*argv,MagickTrue); ExceptionInfo *exception ...

Thanks magick,

I will wait for GetQuantumFormat(). But in the meantime is there any other solution to get information from the Core or Wand API whether a image has long or float pixel?

Regards Juergeen

I have some pictures, where 'identify -verbose' says "quantum:format: floating-point". I want to save the pixels of these and other images with GetOneAuthenticPixel in MagickCore and with MagickExportImagePixels in MagickWand to a long or a double array. To do this, I want to decide from the ...