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An unexpected perf feature
LWN.net Weekly Edition for May 16, 2013
A look at the PyPy 2.0 release
PostgreSQL 9.3 beta: Federated databases and more
LWN.net Weekly Edition for May 9, 2013
You are right; I was confused. I was misled by the fact that the pngcrush output lists a whole series of "methods" that start with method 1:
IDAT length with method 1 (fm 0 zl 4 zs 0) = 38507
IDAT length with method 2 (fm 1 zl 4 zs 0) = 51462
IDAT length with method 3 (fm 5 zl 4 zs 1) = 71769
IDAT length with method 4 (fm 0 zl 9 zs 1) = 34941
IDAT length with method 7 (fm 0 zl 9 zs 0) = 32868
but this "method" is not the same as the "filter method", which is the "fm" number inside the ().
It remains true that for these images the PNG pre-processing does not help. If you're curious, I have put an example tile here: http://chezphil.org/tmp/maptile.png .
> I'd guess you've fed a bunch of more or less totally blank map tiles
PNG + xz ?
Posted Mar 7, 2013 18:34 UTC (Thu) by huftis (subscriber, #58900)
Posted Mar 7, 2013 18:50 UTC (Thu) by huftis (subscriber, #58900)
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