David Feuer schreef:
On 5/1/06, Johannes Schindelin <[EMAIL PROTECTED]> wrote:
You cannot just compare PNGs. The really important information is: where
is the object, not: what color is that pixel. Just think about the
consequences of a small adjustment of the position. The difference of the
PNGs is potentially quite large, even if the difference of the
location is
quite small.
I'm not convinced. What if you apply a slight blur to both images and
then subtract them?
How will you deal with two images that have different sizes? What will
happen if the entire 2nd image is shifted vertically and horizontally by
two pixels. This typically gives a huge difference (all staff lines and
stems will no longer overlap), but there really is (almost) no change in
formatting.
--
Han-Wen Nienhuys - [EMAIL PROTECTED] - http://www.xs4all.nl/~hanwen
LilyPond Software Design
-- Code for Music Notation
http://www.lilypond-design.com
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