I did scan it in color and determined that I can get rid of 95% of the
bothersome reflection by simply deleting the green channel. However,
the green channel carries much of the luminosity and dropping it makes
the image darker. Trying to brighten it adds spikes into the histogram.
I think I'm on to the right solution but I'll have to spend some time
working out the details.
I also tried copying the blue channel and blending in luminosity mode.
That didn't work as I expected or, I should say, PhotoShop didn't work
as expected since it seemed to get stuck. Might even be a PhotoShop
bug. I'll have to go back and retry it again later. But I wish I knew
what it *means* to blend the blue channel's luminosity with the rest of
the image. I can read the words but am not sure exactly what's
happening under the covers.
Maybe I need to blend the luminosity of the green channel... whatever
that means.
Chuck Norcutt
On 9/18/2011 3:45 PM, Paul Laughlin wrote:
> You might try scanning at a different resolution. Sometimes that seems
> to help.
> Paul in Portland OR
>
> On 9/18/2011 4:29 AM, Chuck Norcutt wrote:
>> Thanks, Paul. I'll look for it. I hadn't scanned the original in color
>> because it's B&W and I couldn't see any obvious color cast. However,
>> there may very well be some color info in there that can be taken
>> advantage of.
>>
>> Color scanning has been useful for some of the B&W prints. One album
>> had pages of heavy black paper. But when the paper got thoroughly
>> soaked it started bleeding a reddish-purple dye all over the prints.
>> Scanning in color and desaturating the red channel goes a long way to
>> fixing it.
>
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