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http://www.openoffice.org/issues/show_bug.cgi?id=83102





------- Additional comments from ke...@openoffice.org Tue Feb 10 20:34:52 +0000 
2009 -------
The problem is not that the bilinear filter is not adequate, but that Impress
fails to apply it correctly! To illustrate what I mean, I loaded norbert2's
high-resolution original (demod.png) in Gimp and scaled it by a similar amount
as in his screenshots using the bilinear filter. See demod_gimp_bilinear.png in
attachment. While norbert2's demod_msppt.png looks slightly prettier (probably
because of ppt using a more advanced filter), my demod_gimp_bilinear.png is
quite acceptable; it's a day and night difference with norbert2's 
demod_oooimp.png .

The current behavior of OOo is intolerable to me, while proper bilinear scaling
would be quite satisfactory. I would recommend fixing the bilinear filter ASAP
rather than wasting time on introducing a more advanced one.

As a side note, those more advanced filters have specific weaknesses; while they
generally do a better job in high-contrast images, they often induce artifacts
in low-contrast ones. Bilinear is prefect in its simplicity - it just makes all
images slightly blurry, as if one would apply a Gaussian blur with a 1 pixel 
radius.

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