Digital BW, The Print

Paul,
Was the image shot in RAW format?  The AA filter in the XT should not allow
those type of defects.
I just got back a 9600 color print on HPR at the insane size of 30 x 45
inches.  It was shot with L glass on my Rebel XT, and I'm quite pleased with
it.  Where hung, you can't get closer than 6 feet to it, so it looks
excellent.  I also have a 1Ds, so I do have something to compare it to.  I
experimented quite a bit with the res-up and sharpening before getting the
results I settled on.

Best regards,
John Moody

-----Original Message-----
From: DigitalBlackandWhiteThePrint@yahoogroups.com
[mailto:DigitalBlackandWhiteThePrint@yahoogroups.com]On Behalf Of Paul Roark
Sent: Saturday, July 02, 2005 1:04 PM
To: DigitalBlackandWhiteThePrint@yahoogroups.com
Subject: [Digital BW] Artifacts with Digital images


In working the Windmill image (see my web page below) up to 16 x 20, I found
2 defects in the 8 mp Canon XT/350D image.  First, there was what looked
almost like a double edge at the boundary between the dark tree trunks and
the bright, foggy sky.  I think it was caused by flare and the different
responses of the RGB sensors.  Second, there was visible stair-stepping in
some of the twigs that stick into the sky.  These seem to have resulted
simply from the lack of enough pixels.  I seem to be able to have cured both
problems.

For the edge between the dark tree and bright sky, using a singe color
channel from the shot that was 2 stops under exposed resulted in a very good
edge.

For the stair-stepped twigs, increasing resolution (image pixel size) 250%
in Genuine Fractals took care of them.  It did a significantly better job of
this than did the Photoshop image size algorithm.

Paul
www.PaulRoark.com




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