Convert a GIMP exported Header file back to a PNM Image which can be viewed with any program

extract.c

#include "The-GIMP-exported-file.h"
#include <stdio.h>

/* This code converts a GIMP C export back to a readable PNM Image. Such
   header file looks like

	static const struct {
	  unsigned int   width;
	  unsigned int   height;
	  unsigned int   bytes_per_pixel; // 2:RGB16, 3:RGB, 4:RGBA
	  unsigned char  pixel_data[1252 * 695 * 3 + 1];
	} Image = {
	  1252, 695, 3,
	  "\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377"
	   ...

   SvenK 2017 Public Domain
*/

int main(int argc, char** argv) {
	printf("P3\n");
	printf("%d %d\n", Image.width, Image.height);
	for(int x=0; x<1252 * 695 * 3; x++) {
		printf("%d ", Image.pixel_data[x]);
	}

}

Hi I'm trying to use this code to get the original Image , I used different RGBA files as input with no luck, for example this: https://github.com/dnrl/UE4/blob/ad355f1b341437dbf04c5c4c2102466b5f8d871e/Engine/Source/ThirdParty/SDL2/SDL-gui-backend/src/test/SDL_test_imageFace.c

int main(int argc, char** argv) {
printf("P4\n");
printf("%d %d\n", Image.width, Image.height);
for(int x=0; x<25 * 38 * 4; x++) {
printf("%d ", Image.pixel_data[x]);
}

}
it results in this image:

Any suggestions?

I guess your problem is because your image is RGBA but my code was only tested for RGB images.