speed up thumbnail generation

[Paolo Benvenuto]

Hi!

running photofloat on a big set o images gave me this idea:

now thumbnails are generated beginning with the smallest till the biggest,
and it seems that all the thumbnail are generate from the original photo.

I suggest you to begin with the biggest thumbnail, and to generate the
smaller ones not from the original photo, but from the last generated
thumbnail.

This way the process of thumbnailing speeds up a lot!

Thank you for your attention!

don Paolo Benvenuto
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