getlut_file.c

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/*
      get red, green and blue look up table from an ascii file
 */
#include <genutils.h>
 
#include <stdio.h>
 
int getlut_file(char *lut_file, short *rlut, short *glut, short * blut) {
    int i;
    FILE *file_ptr;
 
    if ((file_ptr = fopen(lut_file, "r")) == NULL) {
        printf("[getlut_file] error opening the lut file\n");
        return (1);
    }
 
    /* read the luts from file */
 
    for (i = 0; i < 256; i++) {
        fscanf(file_ptr, "%hd%hd%hd\n", &rlut[i], &glut[i], &blut[i]);
    }
 
    fclose(file_ptr);
 
    return (0);
}