pixel_to_vec or pixel_for_bmap bug?

 function calculate_colors()
{
	var temp_pixel;
	filehandle = file_open_write ("address.txt"); 
	var format;
	var h = 0;
	var w = 0;
	over_canvas.visible = off;
	wait(2);
	bmap_for_screen(tempy, 1, 0);
	wait(1);
	format = bmap_lock(tempy, 0);
	while(h < bmap_height(tempy))
	{
		while(w < bmap_width(tempy))
		{
			temp_pixel = pixel_to_vec(temp, NULL, format, pixel_for_bmap(tempy, w, h));
			colorpercents[6] += (temp_pixel.green == 75);
			colorpercents[(temp_pixel.red == 255) + ((temp_pixel.green == 255) * 2) + ((temp_pixel.blue == 255) * 4)] += 1;
//Order of colors in array colorpercents is: Other, Red, Green, Yellow, Blue, Purple, Orange, White
			w += 1;
			wait(1);
		}
		w = 0;
		h += 1;
		wait(1);
	}
	over_canvas.visible = on;
	file_var_write(filehandle, colorpercents[0]); //these next few commands write the results of the color scan into an outside document so I can analyze them
	file_var_write(filehandle, colorpercents[1]);
	file_var_write(filehandle, colorpercents[2]);
	file_var_write(filehandle, colorpercents[3]);
	file_var_write(filehandle, colorpercents[4]);
	file_var_write(filehandle, colorpercents[5]);
	file_var_write(filehandle, colorpercents[6]);
	file_var_write(filehandle, colorpercents[7]);
	file_var_write(filehandle, temp_pixel.red); //these three lines write the red, green, and blue values of the last pixel scanned into the same document
	file_var_write(filehandle, temp_pixel.green);
	file_var_write(filehandle, temp_pixel.blue);
	over_canvas.bmap = tempy;
	bmap_unlock(tempy);
	file_close(filehandle);
}