CHECK(conversion->effect->set_int("source_space", input->output_color_space));
CHECK(conversion->effect->set_int("destination_space", COLORSPACE_sRGB));
conversion->output_color_space = COLORSPACE_sRGB;
CHECK(conversion->effect->set_int("source_space", input->output_color_space));
CHECK(conversion->effect->set_int("destination_space", COLORSPACE_sRGB));
conversion->output_color_space = COLORSPACE_sRGB;