> This is incorrect. Photoshop uses its own virtual memory protocol
> which you can not turn off; you should turn off the virtual memory in
> the system memory control panel and let Photoshop handle the virtual
> memory tasks that it requires, otherwise you will get disk thrashing
> and a lot slower performance as the two virtual memory schemes try to
> outthink each other.
If this is so, it is peculiar to the Mac platform and is not the case
for Windows platforms. Since I do not have a Mac but was trying to
extrapolate from what takes place in the PC environment the original
questioner is using a Mac platform, my answer could be off. Under
Windows, Photoshop does use itsown virtual memory process (call the
scratch disk)and does not use the OS' virtual memory system so the two
function compatibly together with each servicing a different set of
clients.
> I've never seen a condition where Photoshop would let you save an
> unsupported format. I doubt that could happen.
I did not say that it would let you save it; I said that if you tried to
do so, it might cause the program to freeze without saving such a file.
> This sort of freezing is often due to bad SCSI cabling, termination
> or connectors (I'm assuming you use mainly SCSI peripherals on the
> 9600, and are not using a Firewire card and drive).
I suppose that this is possible; but why would such cabling problems not
cause other programs and even the OS it self to freeze which does not
seem to be the case. Moreover, the freezing seems to take place when
one tries to save a file which typically does not involve peripherals
(exect possibly in the case of external drives). This would say if it
were bad SCSI cabling, it would happen if one were using internal SCSI
drives ( a possibility on a Mac more so than a PC - except a server).
filmscanners_owner@halftone.co.uk <> wrote:
> At 12:34 PM -0500 7/17/03, LAURIE SOLOMON wrote:
>> I believe that your so-called clue is a normal condition and one of
>> the reasons why one requires a large scratch disk of unfragmented
>> contiguous space usually 3-5 times the size of one's actual file
>> size. You do need to turn virtual memory on so as to use the scratch
>> disks.
>
> This is incorrect. Photoshop uses its own virtual memory protocol
> which you can not turn off; you should turn off the virtual memory in
> the system memory control panel and let Photoshop handle the virtual
> memory tasks that it requires, otherwise you will get disk thrashing
> and a lot slower performance as the two virtual memory schemes try to
> outthink each other. This is covered in the Photoshop manual. As
> mentioned, it's best to use a contiguous fast disk or partition
> assigned solely as a scratch disk for Photoshop. A separate disk is
> best.
>
>> The 120MB of
>> physical RAM is really very little in the scheme of things with
>> contemporary machines having up to 3GB of physical RAM with as much
>> as 1GB asigned to Photoshop. However, unless you are working with 3
>> or 4 100MB plus files during a session, it should not cause the
>> Photoshop to freeze once you turn the virtual memory back on and
>> assign Photoshop a sccratch disk space one a hard drive with some
>> free contiguous unfragmented space of around 100MB or more ( better
>> yet assign the scratch disk itsown dedicated hard drive or, at least
>> a dedicated partition on a hard drive).
>>
>>> There is 304MB installed RAM of which 120,000MB are assigned to
>>> Photoshop.
>>
>> I assume that the 120,000MB iws an error and should read 120MB;
>> otherwise that is your problem, you are trying to do the impossible.
>> :-)
>>
>> You also might check to see if the files which are to be saved are
>> flattened files since sometimes undesr some settings one cannot save
>> unflattened files; files that are 42 bit as oppposed to 24 bit also
>> cannot be saved to a TIFF format.
>>
>
> I've never seen a condition where Photoshop would let you save an
> unsupported format. I doubt that could happen.
>
> This sort of freezing is often due to bad SCSI cabling, termination
> or connectors (I'm assuming you use mainly SCSI peripherals on the
> 9600, and are not using a Firewire card and drive).
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