Hi, I have some difficulties using kth_channel_view. I'm trying to modify the "convolution.cpp" example, like that: #include <boost/gil/gil_all.hpp> ... kernel_1d<float> kernel2(gaussian_1,9,4); convolve_rows<rgb32f_pixel_t>(kth_channel_view<0>(const_view(img)),kernel2,kth_channel_view<0>(view(img))); jpeg_write_view("out-convolution2.jpg", view(img)); ... This doesn't compile. Regards, Fabien