The loss of quality of an image upon flipping has been reported as:
<http://quality.runrev.com/qacenter/show_bug.cgi?id=4512>
A visual illustration of the problem is provided at:
<http://quality.runrev.com/qacenter/attachment.cgi?id=627>
or you can try it for yourself using the demonstration stack
go url "http://revolution.widged.com/bugs/image_flipping_pb.rev";
related bug: 4098. Rotation looses the quality+transparency of the
image, which has been confirmed on 2.8 by runrev staff yesterday
(hey, they go through the list of bugs ;-) ).
A work around for this problem is to first parse the alphadata to
replace all values under 15 by a value of 0 and all values over 240
by a value of 255. Some code for manipulating the alphadata of a
picture was provided at:
<http://forums.runrev.com/phpBB2/viewtopic.php?t=418>
Best,
Marielle
------------------------------------------------
Marielle Lange (PhD), http://widged.com
Bite-size Applications for Education
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