Hi Oliver,

I don't get it to compile even when you put the nth_channel_view call
inside jpeg_write_view for a simple reason. nth_channel_view needs the
reference type of your any_image. But that's not possible since no one
knows what image type the any_image actually is. You can cast your
any_image to a specific image type using gil's variant::_dynamic_cast
member. Then you can use nth_channel_view.

Are you sure your code compiles? Let me know if you keep having troubles.

Regards,
Christian
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