P3D Re: PHOTO-3D digest 2679

[Sid Herbage <sid@xxxxxxxxxx>]

>>How about making a negative print from your positive slides, scanning that,
>>and then simply reversing the colors in Photoshop or whatever?
>
>Color negatives have a strong (orange?) color bias - this is normally
>removed with filters in the printing process. If you scan and just reverse
>the colors, you'll still have a color bias in the "other" direction.
>If you mathematically compensate, I expect you'll lose some density range
>in some of the colors in the final result (at least for a scanner that was
>intended for positives). (Do professional Photo-CD scanners use filters, or 
>just mathematical compensation for color bias?)

If anyone is interested in doing this in Photoshop (converting colour
negatives
to positives and removing the colour mask), there are detailed instructions
at:

http://www.interlog.com/~pinkster/photo/neg2pos/neg2posa.html



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