Roe mk11 TILES Builder pseudocode

            //pseudocode:

            //loop through width and height of source image

            //get color in image $image[ 'mask' ] at pixel ($col,$row)
            $pix[ 'mask' ] = imagecolorat( $image[ 'mask' ], $col, $row );

            //get color in image $image[ 'rgb' ] at pixel ($col,$row)
            $pix[ 'rgb' ] = imagecolorat( $image[ 'rgb' ], $col, $row );

            //if pixel in $image['mask'] at ($cow,$row) is white:

                //set pixel in $image['combo'] at ($cow,$row) as fully transparent
            //else
                //set pixel in $image['combo'] at ($cow,$row) as pixel color in $image['rgb'] at ($cow,$row) with full opacity

            //save resulting image as new file