[filmscanners] RE: Scanning Overexposed Slides

["Jawed Ashraf" <Jawed@cupidity.force9.co.uk>]

Sadly the big problem with Luminosity channel in LAB is it is a very coarse
control.

Incredibly, in Adobe's infinite wisdom (similar to the fashion that PSCS is
the first product to fully support 16-bit operation throughout, as far as I
understand it) the L channel operates on a scale of 100, whereas red, green
and blue channels in RGB mode operate on a scale of 255.  Adobe continues to
prove it's bonkers.

Maybe one day they'll fix it.

In the meantime, yes, L channel needs to be used very delicately.

Jawed

> -----Original Message-----
> From: filmscanners_owner@halftone.co.uk 
> [mailto:filmscanners_owner@halftone.co.uk] On Behalf Of Al Bond
> Sent: 24 November 2004 23:19

> 
> So far, the most promising approach seems to be to change to 
> LAB colour and
> use a gentle Curves adjustment on the Luminosity channel to shift the
> highlights back towards the mid-tones and repeat the same 
> adjustment several
> times.  If I try to do it all in one big Curve adjustment, it 
> starts to look nasty
> very quickly (due to my lack of proficiency with curves 
> rather than any
> deficiency in PS!).
> 
> I don't think the recovered images will ever look brilliant 
> but at least my wife
> might get some mementos of her Spanish trip.
> 
> 
> Al Bond

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