In several blur filters, we have the options "Use the selection as
input" and "Use the entire layer as input".
I don't understand well these options. If I test "Use the entire layer
as input" in Pixelize with a selection, I can see some slight
differences in result, but I don't find, in result, colors that are in
the layer outside the selection.
In my mind, in Pixelize, the color of a pixel is the mean of colors in
the square it belongs to, and "use the entire layer as input" looks weird.
Can you enlighten me on this point?
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