Re: Question re: AVG

In article <Xns9AFA513D2889Bavocatstuyahoofr@xxxxxxxxxxx>,
spamtrap@xxxxxxxxxxxx says...
Paul Carpenter <paul@xxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
spamtrap@xxxxxxxxxxxx says...
Marc Wilson <E-0C001302-3153-E@xxxxxxxxxxxxxxx> wrote:
(Stuart Bronstein) wrote

I often scan documents for various uses. When I do, AVG takes
over and insists on reviewing the scanned docs, which takes
about all the computer's available resources for quite some
time.

You can exclude certain directories from scanning- set the
location to save scanned files to be one that's excluded.

Thanks. I'll give it a try.

And on a limited test it seemed to work!

You may find minimal improvement as it may not be AVG giving the
REAL problem, it might also be that you are scanning documents at a
high resolution for a large area, plus other processing of the
image going on as well. So AVG may be trying to scan files not
completed yet or lots of temporary files as well.

I don't quite understand this. Are you saying that it's because the
file is so large or that there are several smaller files that add up to
one large one?

Email is scanned in blocks as it is received, similarly it may be
scanning the temporary and the final files of the scanning process
as they are being created.

In any case, after a scan AVG takes over and it takes
quite some time before I can use the computer again - often it seems
like 30 to 60 seconds. Ok, that's not real long,

If the scanned image is 50MB plus, I would not be surprised.
There may well be all sorts of delayed actions from the scanning process
(e.g. deleting temporary files; also messing this up (e.g. operating
system deletes file, part way through the scan, AVG then has to work out
file has disappeared before moving on.

May well be the temporary files are scanned as well, delaying the
operating system from dleting the files so more copies of the data file
are actually scanned than the final result.

but in context it
seems like a long time, particulary when it happens over and over
again.

Please don't set any system or user general temporary files folders
not to be scanned as this will allow all sorts of things that come
in not to be scanned.

There is just one file that the scanning software (Paperport by Nuance)
sends scanned files to, and I unchecked that with respect to the
Resident Shield feature. Under versio 7.5 I knew how to specify files
for the periodic scanning process, but I haven't been able to figure
out how to do that under version 8.

Several things are different, and I would need to delve into the system.

If your scanner is HP their software is notorious for being bulky
and slow for actual scanning.

It's an HP machine, software, as I said, by Nuance (which I don't
particularly like, but it works). I always keep Windows Tax Manager
(yeah, I know, I'd rather not use Windows) open, so it shows the
problem is AVG and not some other programme.

It shows AVG is having a hard time at that point.

I have seen scanned file sizes before saving as JPG or similar
compression of greater than 120MB for one sheet of A4. Even some
'small' scanned files as JPG have to be processed as two or more
very large files before they become the 'small' JPG. This process
can be what appears to slow the scanning.

I usually scan into pdf, but this time was using jpg which are fairly
large. I can see why it would take time to scan them.

Scanning into PDF or JPG actually requires scanning a raw image file
first (temporary file) which will then be converted into JPG. The
delay may well be that AVG is scanning the raw image temporary file
that is taking time. Not scanning the particular scanner folder
should stop that.

The temporary raw image file will be HUGE

11 inches x 300 dpi = 3300 pixels per column
8 inches x 300 dpi = 2400 pixels per line
Page = 2400 x 3300 = 7920000 pixels

Bytes in colour = 3 x 7920000 (minimum)
= 23,760,000 (3 bytes per pixel)

= 22.66 MB minimu plus any overhead details stored

Worst case the data is stored as 32 bits containing a pixel then
the size is

4 * 7920000 = 31680000
= 30.212MB plus other overhead

At 600 dpi the figure is 4 x larger 90.64 MB (3 bytes per pixel)

Larger paper also increase the raw image size.

If any form of processing is done in software then there will be created
at LEAST one file for each stage of the processing (contrast,
brightness, sharpening etc..) as they rarely hold all the stages in RAM.
The size and amount of files mounts up quickly.

But since they
are coming from a non-internet, completely safe source, I thought it
would safe time if AVG could be told that things coming in through a
particular port or device would not need to be searched.

Remember viruses were first (and still are) distributed via any media
(scanner is not really a media though), so all files have to be checked
on any medium even CD (when read at least). A file written to the hard
drive is a file, its source is 99% of the time not relevant, as any
amount of nasties may interfere even with a filecopy process to add a
virus. Even to JPG files.

--
Paul Carpenter | paul@xxxxxxxxxxxxxxxxxxxxxxxxxxx
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.

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