RE: filmscanners: Tweaking images in PS6

["Finch, Jason V" <jvfinch@intergraph.com>]

Title: RE: filmscanners: Tweaking images in PS6

I think i read something about this in the Photoshop for Photographers book.  Converting to 16bit colour and doing colour levels and curves and then converting back to 8bit produced a "better looking histogram" than if the adjustments were done purely in 8bit.

I would try to do colour adjustments in 16bit in as few steps as possible. Since every adjustment/process would lead to some loss of information.

Convert back to 8bit and then use adjustment layers for any other processes required.
Regards,
Jason

-----Original Message-----
From: Andreas Kurz [mailto:ak@editors.de]
Sent: Thursday, February 08, 2001 8:52 AM
To: filmscanners@halftone.co.uk
Subject: filmscanners: Tweaking images in PS6

Hello,
I'm not very experienced in digital imaging and have a question which
probably has been discussed before.
I use an Nikon LS30 scanner to produce 48 bit tiffs with vuescan. Then I
tweak the images in PS6. Is it better to do all possible tweaking in 48 bit
mode, one after the other, which needs rendering the picture each time, or
is it better to convert the image to 8 bit and use adjustment layers which
renders the image just once.
Another question about vuescan: The LS30 internally uses 10 bit, the output
is just an 8 bit file. Vuescan produces images in 16 bit mode by rerendering
the file if I understood right. Has this file really more information than
the 8 bit file the scanner itself outputs?
Thanks,
Andreas