components per pixel with stb_image.h

[nothings]

components per pixel with stb_image.h

[rygorous]

This is the intended behavior. Quoting from the header file:

If req_comp is non-zero, *comp has the number of components that would
have been output otherwise. E.g. if you set req_comp to 4, you will always
get RGBA output, but you can check *comp to easily see if it's opaque.

-Fabian
On Apr 3, 2015 08:51, "Kyle Swanson" [email protected] wrote:

Forcing the number of components per pixel doesn't seem to be working with
stb_image.h. Calling stbi_load() with any number between 0 .. 4 always
results in 3. See code below.

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#define STB_IMAGE_IMPLEMENTATION
#include "stb_image.h"
int main(int argc, char **argv) {
const char *inputFile = argv[1];
const char *outputFile = argv[2];
int x,y,n;
unsigned char *data = stbi_load(inputFile, &x, &y, &n, 1); //This should force just one (gray) component per pixel.

if (!data) {
    fprintf(stderr, "Couldn't load image.\n");
    return (-1);
}

printf("%d\n", n); //This prints `3`, should print 1.

stbi_image_free(data);
return 0;

}

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