[Image-SIG] Re: Getting Image resolution

[Amal P Anand]

You can the information from tiff header if the creator
of the image file has specified the resolution.
Below I give a sample program in ANSI C .I have
tried this program on RedHat Linux 6.2;You need a
library called tiffio.h which comes default with Linux;
If you dont have linux i can mail you the complete C
source code or the tiff header specification file;Just
mail me if you want so;Hope this helps you;

Resolution.c
-------------


# include <tiffio.h>

main ( int argc, char * argv [ ] )
{

     TIFF * tif = TIFFOpen ( argv [ 1 ], "r" );

     if ( tif ) {

         uint32 w, h;
         uint16 bps, spp;
         float  xr, yr;

         TIFFGetField ( tif, TIFFTAG_IMAGEWIDTH,                  &w );
         TIFFGetField ( tif, TIFFTAG_IMAGELENGTH,             &h );
         TIFFGetField ( tif, TIFFTAG_BITSPERSAMPLE,             &bps );
        TIFFGetField ( tif,
            TIFFTAG_SAMPLESPERPIXEL, &spp  );
         TIFFGetField ( tif, TIFFTAG_XRESOLUTION,
            &xr );
         TIFFGetField ( tif, TIFFTAG_YRESOLUTION,
            &yr );

          printf("width = %d\nlength = %d\n"
              "bitspersample = %d\nsampleperpixel = %d\n"
              "xres = %f\nyres = %f\n",w,h,bps,spp,xr,yr);

          TIFFClose ( tif );
     }

     exit ( 0 );
}

-------------------------------------------------------

In linux compile as follows

cc Resolution.c -ltiff

To Run

./a.out  your-tiff-file

You can get help about this libtiff library at /usr/doc/libtiff



----- Original Message -----
From: <image-sig-request@python.org>
To: <image-sig@python.org>
Sent: Wednesday, January 30, 2002 10:31 PM
Subject: Image-SIG digest, Vol 1 #557 - 2 msgs


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> Today's Topics:
>
>    1. Getting Image resolution ? (Doyon, Jean-Francois)
>    2. Re: Getting Image resolution ? (Terry Hancock)
>