Wow, so the sips conversion time + bmp load time is still faster than
just loading the PNG?
Not necessarily. You have to try it on your machine, using your
image data.
For example, your original post said it took 200 ms to read a
2550x3300 png image. I was never able to even come close to that
rate on my 2.0 GHz Core 2 Duo Mac mini.
Also, I used 'sips' to convert some original JPEG images (Canon A95
photos) to PNG, and then tested those PNG images with ImageIO.read
(). Since PNG supports a variety of formats and encoding options,
it's possible that the combination sips is writing is pessimal for
the Java ImageIO reader.
I can't tell you what will be fastest on your machine, because I
don't have a 3.0 GHz Xeon, and my tests so far show that CPU clock-
speed alone doesn't account for everything. Ultimately, I think
you'll have to try several things yourself, possibly using some of
the previously posted suggestions, because it's quite possible that
the combination of hardware and image data you have will determine
exactly which approach is fastest. I don't think there's one
universal answer.
I'd somehow thought that on Leopard with 64-bit hardware, the
server VM
was always chosen. I'll try this -d64 switch.
Enter the 'java -version' command and observe the output.
Also, server VM and 64-bit refer to different things. There is a 32-
bit server VM. There is no client 64-bit VM, though. So, 32-bit has
client or server VM, 64-bit only has server VM, and the 'java'
command defaults to 32-bit client VM.
-- GG
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