Hi, Thanks for your reply, I initialize view member using io extension to read image file. I try to create a local rgb8_image_t in crop method because I have another method fill. It look like this: Image& Image::Fill(int x1, int y1, int x2, int y2, int r, int g, int b) { boost::gil::rgb8_pixel_t pixel(r, g, b); boost::gil::fill_pixels( boost::gil::subimage_view(view, x1, y1, x2 - x1, y2 - y1), pixel); return *this; } But when I do this: Image a("a.png"); Image b; a.crop(100, 100, 50, 50, b); a.fill(100, 100, 50, 50, 0xff, 0xff, 0xff); I found that b will be also filled with white color. So, I try to "copy" all pixels from a to b. copy_pixels requires two view with the same dimension, but I can't change dimension of a view directly, that is why I create a local rgb8_image_t to do that. Now, I clarify my requirement. I need to do this: Image a("a.png"); Image b; a.crop(100, 100, 50, 50, b); a.fill(100, 100, 50, 50, 0xff, 0xff, 0xff); a and b are now with independent view. a.fill should not affect b. How can I do that? Thank you! -- View this message in context: http://www.nabble.com/-GIL--How-can-I-copy-a-subimage_view-to-a-view--tp2323... Sent from the Boost - Users mailing list archive at Nabble.com.