Re: Irfanview question

On Tue, 15 Nov 2005 00:46:40 -0500, Cathy wrote:

> Well, most of the time the files I was trying to edit are all of people
> taken with indoor flash , and are over 1 MB and after editing they have
> been slightly bigger than the original - say 1.2MB.
> Yet some edited versions from the original might only be 566 KB. It just
> seemed to me to be a much smaller file size than the original when most
> of the time, the edits are a bigger size than the original. So far, I
> mainly edit to make a photo a bit lighter and in some fixed redeye.
> thats all I know how to do :)

I don't know the source of all of your files. What you're seeing
might be due to the originals having different amounts of
compression. That would be odd if they're all from your own camera,
although even there it's possible, since many cameras allow the
selection of different amounts of compression. One way to check
with IrfanView is to examine the Image Information. By comparing
the Disk Size and Current Memory Size you can see what the original
compression ratio was. If it's comparable to IrfanView's current
setting (what it calls Save Quality, and which is difficult to
compare directly because I don't think the number it uses is a
compression ratio, but I haven't checked closely), then when you
save an edited file you should end up with a new file of about the
same size. But if the original file was very high quality (almost
no compression), then when IrfanView saves an edited version of that
file, the result should be a much smaller file, since IrfanView
would have applied its own default compression.



> Also, what about the fact that most of the originals I want to edit
> have "Read only" in Attributes and only a few say "Archive". But what
> you are saying could be right. I really don't know.

That's odd. They all should have the Archive bit set. Normally
the Archive bit is only lost when a backup program saves a copy of
the file and has been configured to remove the Archive bit of files
that have been backed up. It's also odd that the file's Read Only
attribute would also be set. That usually only happens when files
are copied to a computer's hard drive from a CD or DVD.

.

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