hdf5/hl/examples/ex_image1.c

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#include "hdf5.h"
#include "hdf5_hl.h"

#define WIDTH         (hsize_t)400
#define HEIGHT        (hsize_t)200
#define PAL_ENTRIES   9
unsigned char buf [ WIDTH*HEIGHT ];

int main( void )
{
 hid_t         file_id;
 herr_t        status;
 hsize_t       pal_dims[] = {PAL_ENTRIES,3};
 hsize_t       i, j;
 int           n, space;
 unsigned char pal[PAL_ENTRIES*3] = {  /* create a palette with 9 colors */
 0,0,168,      /* dark blue */
 0,0,252,      /* blue */
 0,168,252,    /* ocean blue */
 84,252,252,   /* light blue */
 168,252,168,  /* light green */
 0,252,168,    /* green */
 252,252,84,   /* yellow */
 252,168,0,    /* orange */
 252,0,0};     /* red */
 
 /* create an image of 9 values divided evenly by the array */
 space = WIDTH*HEIGHT / PAL_ENTRIES;
 for (i=0, j=0, n=0; i < WIDTH*HEIGHT; i++, j++ )
 {
  buf[i] = n;
  if ( j > space )
  {
   n++;
   j=0;
  }
  if (n>PAL_ENTRIES-1) n=0;
 }
 
 /* create a new HDF5 file using default properties. */
 file_id = H5Fcreate( "ex_image1.h5", H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT );
 
 /* make the image */
 status = H5IMmake_image_8bit( file_id, "image1", WIDTH, HEIGHT, buf );
 
 /* make a palette */
 status = H5IMmake_palette( file_id, "pallete", pal_dims, pal );
 
 /* attach the palette to the image */
 status = H5IMlink_palette( file_id, "image1", "pallete" );
 
 /* close the file. */
 status = H5Fclose( file_id );
 
 return 0;
 
}