Hi there I just tried to convert an arbitrary jpeg image to a grayscale image and write it to a png file. The attached file fails to compile, because there is no pixel_t in an any_image_view. The compile acually complains about a missing static "make" method. This is because of sfinae applies when SrcView is substituted by any_image_view in this structure template: image_view_factory.hpp:102: template <typename SrcView, typename DstP, typename CC=default_color_converter> struct color_converted_view_type : public detail::_color_converted_view_type<SrcView, CC, DstP, typename SrcView::pixel_t> { GIL_CLASS_REQUIRE(DstP, GIL, MutableHeterogeneousPixelConcept); }; How do I have to adapt the color conversion to work with any_image_views? Best regards Andreas Pokorny