> That looks like the job for the filter, see inflate, deflate, erosion
and dilation filters.
I just tested the dilation filter. It's a nice workaround if the
downscaling factor is 3:1, as in my example. But if the downscaling
factor is smaller, for example from 5472x3648 to 900x600, which is 6:1,
then it fails. The star would be visible in 50% of the frames and
invisible in the other 50%. What I need is a scaling algorithm which
automatically chooses the brightest pixel out of the corresponding
pixels from the input file. If the downscaling factor is 6:1, then the
neighborhood is 6x6 pixels.
Michael
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