Reduze the image area by 4 (w/2,h/2). \n
* Images must be of the same type. Target image size must be source image width/2, height/2.
* Can not operate on IM_MAP nor IM_BINARY images.
*
* \verbatim im.ProcessReduceBy4(src_image: imImage, dst_image: imImage) [in Lua 5] \endverbatim
* \verbatim im.ProcessReduceBy4New(image: imImage) -> new_image: imImage [in Lua 5] \endverbatim
* \ingroup resize
Reduze the image area by 4 (w/2,h/2). \n * Images must be of the same type. Target image size must be source image width/2, height/2. * Can not operate on IM_MAP nor IM_BINARY images. * * \verbatim im.ProcessReduceBy4(src_image: imImage, dst_image: imImage) [in Lua 5] \endverbatim * \verbatim im.ProcessReduceBy4New(image: imImage) -> new_image: imImage [in Lua 5] \endverbatim * \ingroup resize