On 27/02/2005, at 4:51 AM, GSR - FR wrote:
[EMAIL PROTECTED] (2005-02-26 at 1805.22 +1100):
In order to get past any background processing photoshop may have been
doing, I also tried adjusting the curve in the curves dialog then
quickly hit OK - this came out taking the same time as if I moved the
curve and waited 10 seconds before clicking OK. Closing the image
immediately afterwards was also instant, so there seemed to be no
tricky background processing happening over the whole image area.
For anybody trying to guess about background tricks, best would be a
system monitor and see the CPU load. If app says it has ended, but the
monitor reports the app is eating near 100%, there are some kind of
trick there, or interface oriented optimization, it depends the point
of view. So fire up top, gkrellm, activity monitor, task manager or
whatever you have in the OS and see what is really going on.
Aha! - That has revealed it I think - from the results it seems there
may be background completion of each task, and perhaps some form of
queuing as well.
Doing one Levels change across the image in Photoshop came out as in my
earlier post - with control coming back to me within a second - but top
showed CPU use was above 70% for another 4 seconds before it dropped
down to 1-2% idle again.
Doing eight operations quickly, one after another - a combination of
adjusting curves, levels and color balancing - left the cpu use peaking
up high for about 16 seconds after finishing the last op. I'd expect to
see that if each operation was being queued. Whatever it's doing in the
background is transparent enough that zooming around and drawing over
the image works OK as it's happening - prioritising what needs to be
quick & interactive, and playing catchup with the rest a bit later
whenever the user pauses.
I imagine many of the benefits of an interface optimisation like that
would be lost for heavily scripted processes involving those colour
based functions ( levels, color balance, curves, brightness/contrast,
posterize etc).
dana
--
http://www.danaquarium.com/
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