Comp question to photographers in general. - bit.listproc.stockphoto

Message from discussion Comp question to photographers in general.

Rubens Abboud

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More options Jan 11 2007, 12:22 am

Newsgroups: bit.listproc.stockphoto

From: rubens_abb...@hotmail.com (Rubens Abboud)

Date: 10 Jan 2007 05:22:15 -0800

Local: Thurs, Jan 11 2007 12:22 am

Subject: [STOCKPHOTO] Re: Comp question to photographers in general.

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--- In STOCKPH...@yahoogroups.com, "David Riecks" <david@...> wrote:

> Ed Verkaik wrote:

> > I may be wrong, but was assuming that if you displayed a higher
> quality jpeg
> > on a monitor, that the full gamut and file quality does not
> translate to the
> > screen. Do you think most monitors being used today show 100% of
> what is in
> > a file, regardless of the PS quality level chosen?

> Ed:

> I just ran a test, as I wanted to test your assumption since I
didn't
> know either.

A screen capture on a Windows machine will capture the exact
contents, pixel for pixel, that one sees on the screen. The Windows
GDI has its own function to do this, BitBlt.

I have no idea how the Mac does it, but I would expect it to be very
similar.

http://tinyurl.com/6n6lq

If one is really worried about theft of their images, one can
display them in a movie file. Many (most?) PCs today have graphics
cards with some sort of hardware accelerator which renders the movie
in a different part of video memory that will not be captured by
BitBlt.

You can try this yourself. Go to CNN.COM, play any of the videos,
then press PrtScr. Go to PAINT, then press Paste (Ctrl-V).

If your video accelerator is on, you'll see a perfect screenshot
with blacked out video. If the accelerator is off (or if you don't
have it on your PC), you'll see whatever video frame was playing
when you pressed PrtScr.

Most PC users are not aware of this and anyone with hardware
acceleration usually has it on by default. For the truly paranoid,
this would probably be more effective than gimicky "encryption"
software that preys on the technologically ignorant.

I should be clear that there are ways to capture movie frames from
even an accelerated card using specialized screen capture software.
I think SnagIt does it. But many simpler software that use the base
BitBlt function will not work.

Best regards,

Rubens.
http://www.TheImageNation.com
Travel stock photography

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