threshold_rgb
Tcl_Obj* imageObj
Tcl_Obj* thresholdRObj
Tcl_Obj* thresholdGObj
Tcl_Obj* thresholdBObj

crimp_image* image;
crimp_image* thresholdr;
crimp_image* thresholdg;
crimp_image* thresholdb;
crimp_image* result;
int          x, y;

crimp_input (imageObj,      image,      rgb);
crimp_input (thresholdRObj, thresholdr, grey8);
crimp_input (thresholdGObj, thresholdg, grey8);
crimp_input (thresholdBObj, thresholdb, grey8);

result = crimp_new_like (image);

for (y = 0; y < image->h; y++) {
    for (x = 0; x < image->w; x++) {

	R (result, x, y) = R (image, x, y) >= GREY8 (thresholdr, x, y) ? BLACK : WHITE;
	G (result, x, y) = G (image, x, y) >= GREY8 (thresholdg, x, y) ? BLACK : WHITE;
	B (result, x, y) = B (image, x, y) >= GREY8 (thresholdb, x, y) ? BLACK : WHITE;
    }
}

Tcl_SetObjResult(interp, crimp_new_image_obj (result));
return TCL_OK;


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