On Tue, 1 Jul 2003, Dirk Meyer wrote:
> Hi,
>
> I wanted to speed up the image menu (and all other menus because they
> show images, too). That's what I found out:
>
> pygame is slow when reading png or jpg files. PIL is faster, but
> transforming PIL images to pygame images is also slow. Right now, we
> use png to store our thumbnails. For an example file, the cachefile
> has the size of 70322 Bytes. Using jpg as cache is a little bit slower
> (but not much), the size is 2827 Bytes. We could save disc space by
> using jpg. But still, the speed is awful. But we could save the raw
> image of the thumbnail using cPickle[1]. This size is now 216026
> Bytes. It's about three times the size we use now, but it's much
> faster, much?, no very much! In my test folder I needed about 5 secs
> to enter with png or jpg, now it's only 1 sec and this sec is used by
> the mmpython cache.
>
> Question: how important is the usage of three times the space? I vote
> for raw data.
PNGs have the advantage that they can store alpha information
which may be useful. So using jpg only may not be an option.
I would prefer using raw-images, too. Pure caching of files
does not make very much sense anyways since the operating
system already does this.
l8r...
Thomas
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