Re: filmscanners: RE: filmscanners: image samples of digital artifacts

2001-07-20 Thread Lynn Allen

Well, this may be what Dan Honemann is up against
on his notebook computer.  I told him to ditch it.

That's a little extreme, Rafe. :-) Granted that an LCD is not suited to 
*working* on graphics, it's viable for *viewing* them. Still, if Dan throws 
out his Dell Inspiron, I hope he throws it in my direction--I could use a 
portable backup, and could keep up with the List while I'm fishing or on 
vacation. g

Best regards--LRA


From: rafeb [EMAIL PROTECTED]
Reply-To: [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Subject: Re: filmscanners: RE: filmscanners: image samples of digital  
artifacts
Date: Thu, 19 Jul 2001 23:23:43 -0400

At 11:33 AM 7/20/01 +1000, Rob wrote:
 Rafe wrote:
 I'm willing to bet that Dan Honemann has his video
 set to 256 colors (indexed color.)
 
 Some video drivers in Windows (particularly the generic Windows ones as
 opposed to OEM) only display 256 colours despite being set to 16bit or 
24bit.
  It was one reason I had to throw out a video card when I went from Win
 3.11 to Win95.


Well, this may be what Dan Honemann is up against
on his notebook computer.  I told him to ditch it.


rafe b.




_
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filmscanners: Re: filmscanners: image samples of digital artifacts

2001-07-19 Thread Rob Geraghty

Lynn wrote:
 Hoo, boy, that *would* be useful! Presently, every definition is
 about a half-click away from the next guy's definition. If I had
 a website, I'd give it a go (I've got *plenty* of examples!)--
 maybe some kind-sprited, web-savvy member will do it?

I'd be happy to put things online provided the examples are appropriately
sized.  I already have a page about scanning to explain the work which was
being done on looking at film types.  It would be good to have examples
of things which are problematic about scanning.

Rob


Rob Geraghty [EMAIL PROTECTED]
http://wordweb.com






filmscanners: RE: filmscanners: image samples of digital artifacts

2001-07-19 Thread Rob Geraghty

Dan wrote:
One thing I've always been curious about is what causes the topographical
map type of lines you see in the blue sky portion of this image:
http://www.chebucto.ns.ca/~taiji/gallery/t21.htm
I see this sort of artifact a lot in jpegs on the web.  Is this what is
called jaggies?  Do they show up in prints?

You need more colours.  This looks fine in 24bit on my work computer.  You
may be running less than 24bit colour.  Depending on the OS some video drivers
don't display a full palette of 24bit colour even though the driver claims
to be set to it.

So no, it's not jaggies exactly - it's your video card dithering the colours
down to what fits in your palette.

Rob


Rob Geraghty [EMAIL PROTECTED]
http://wordweb.com






filmscanners: RE: filmscanners: image samples of digital artifacts

2001-07-19 Thread Rob Geraghty

Rafe wrote:
I'm willing to bet that Dan Honemann has his video
set to 256 colors (indexed color.)

Some video drivers in Windows (particularly the generic Windows ones as
opposed to OEM) only display 256 colours despite being set to 16bit or 24bit.
 It was one reason I had to throw out a video card when I went from Win
3.11 to Win95.

Rob


Rob Geraghty [EMAIL PROTECTED]
http://wordweb.com






Re: filmscanners: RE: filmscanners: image samples of digital artifacts

2001-07-19 Thread rafeb

At 11:33 AM 7/20/01 +1000, Rob wrote:
Rafe wrote:
I'm willing to bet that Dan Honemann has his video
set to 256 colors (indexed color.)

Some video drivers in Windows (particularly the generic Windows ones as
opposed to OEM) only display 256 colours despite being set to 16bit or 24bit.
 It was one reason I had to throw out a video card when I went from Win
3.11 to Win95.


Well, this may be what Dan Honemann is up against 
on his notebook computer.  I told him to ditch it.


rafe b.





filmscanners: RE: filmscanners: image samples of digital artifacts

2001-07-19 Thread Rob Geraghty

Dan wrote:
It was set to 16-bit (True Color), so I changed it to 24-bit (High Color)
and rebooted.  Still see the lines in the sky, but this is only a Dell
Inspiron 3500 notebook PC with a NeoMagic MagicMedia 256AV card and a 14
LCD screen.  No doubt something in that mix isn't up to snuff.

Try hooking up a proper monitor.  The LCD is probably very limited in
the number of colours it can display.

Rob


Rob Geraghty [EMAIL PROTECTED]
http://wordweb.com