int is_color_inside(png_bytep *all_colors, png_bytep color, int kl) {
    for (int i = 0; i < kl; i++) {
        if (all_colors[i][0]==color[0] && all_colors[i][1]==color[1] &&
        all_colors[i][2]==color[2] && all_colors[i][3]==color[3]){
            return 1;
        }
    }
    return 0;
}

int count_colors(struct Png *image) {
    int kl = 0;
    int clr = 100;
    int colour_width = 4;
    png_bytep *all_colors = malloc(clr * sizeof(png_bytep));
    for (int i = 0; i < clr; i++) {
        all_colors[i] = malloc(colour_width * sizeof(png_byte));
    }

    for (int y = 0; y < image->height; y++) {
        png_bytep row = image->row_pointers[y];
        for (int x = 0; x < image->width; x++) {
            png_bytep ptr = &(row[x * 4]);
            if(!is_color_inside(all_colors, ptr, kl)){
                all_colors[kl] = ptr;
                kl++;
                if(kl==(clr-1)){
                    clr+=10;
                    all_colors = realloc(all_colors, clr * sizeof(png_bytep));
                }
            }
        }

    }
    puts("Все цвета изображения:");
    for (int i = 0; i < kl; i++) {
        printf("%d %d %d %d\n", all_colors[i][0], all_colors[i][1], all_colors[i][2],
               all_colors[i][3]);
    }
    return kl;
}