Hi, I have a rgb8_image_t::view_t view, and I want to convert some part of it to grayscale within its region, for example: 0,0,100,100 (x,y,width,height) How can I do this? I try to do this but it can't be compiled. typedef boost::gil::pixel< typename boost::gil::channel_type< boost::gil::rgb8_image_t::view_t>::type, boost::gil::gray_layout_t> gray_pixel_t; boost::gil::copy_pixels( boost::gil::color_converted_view<gray_pixel_t>( boost::gil::subimage_view(view, x, y, width, height)), boost::gil::subimage_view(view, x, y, width, height)); Thank you very much. -- View this message in context: http://www.nabble.com/-GIL--How-can-I-in-place-convert-some-part-of-view-to-... Sent from the Boost - Users mailing list archive at Nabble.com.