[filmscanners] Re: Photoshop (on Mac) bogs, VueScan hoggingprocessor?

["G3" <G3@his.com>]

To All:
        I just opened VueScan 7.4.2 for Mac OS X.  The Unix-based OS
X has some powerful utilities that allow you to monitor the system.
One is called Process Viewer that shows the memory and CPU use for
all open applications and system processes.
        While scanning either a preview or final scan in VueScanX,
the CPU usage is about 5-10 %.  However, once the scan is done, CPU
usage jumps to about 45%, even when it is in the background and at
idle.  There may be some CPU usage effect for Ed to work on.
        However, let me say that VueScanX works very well under OS X
and is the only software that drives my Canon FB 1200S flatbed SCSI
scanner under OS X (Canon have not yet released an OS X driver).  I
have been able to make nice color and B/W scans.  The only difficulty
is that the OS X support for the built-in SCSI port on my Beige G3
does not work well with the scanner, but an Adaptec 2903 card with
Adaptec OS X drivers works fine.
                Regards,
                Bob

>I have Photoshop 6.0.1 running on a Mac G4/867, under OS 9.2.2.  This Mac
>has 1.5GB RAM (600MB allocated to PS).  PS has a 10GB scratch partition
>on a second internal HD.  This is usually a very quick system.  But
>sometimes I see Photoshop operations slowing to a crawl.  Example: I set
>a up a selection rectangle for a crop or free transform, and drag on one
>of the handles.  The handle does not move with my mouse drag, and the Mac
>is unresponsive for 30 seconds or a minute.  Then the screen suddenly
>redraws and the Mac is responsive again.
>
>VueScan 7.4.2 is running in the background (with a scanned image, but
>idle).  If I quit VueScan, and retry the same operations in Photoshop,
>the selection handles move properly as I drag them, and the image redraws
>in a few seconds.
>
>Has anyone else seen effects like this?
>
>One possibility is that VueScan, although idled, is in a state which hogs
>CPU cycles.  Mac OS versions 9.x and earlier run cooperative
>multitasking.  When applications are running in background they are
>supposed to quickly yield the CPU.  Another wild guess: some sort of
>activity at the driver level.  I use VueScan on a Nikon LS-4000.
>
>--
>Julian Vrieslander <mailto:julianv@mindspring.com>
>
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