----- Original Message -----
From: Bond, Alistair <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Wednesday, October 11, 2000 7:50 AM
Subject: Need a Photoshop suggestion!
> Hi folks!
>
> I wonder if anyone can give me some pointers on how to achieve
> something in Photoshop.
>
> My Elite has a couple of very faint single pixel tramlines in the
> green channel. These are invisible in 99% of scans but do start to
> become obvious if I have to really pull up shadow detail but cannot
> increase exposure (in order to preserve highlight detail). Currently,
> I use the marquee tool in Photoshop to highlight the whole line and
> the Median filter to blend in with the adjacent lines.
>
> This is OK but the lines only really affect the deep shadow detail.
> (It looks like these 2 CCD elements are returning a slightly higher
> base value than the others.) Once above this level, these elements
> are fine and return proper mid and highlight data - and I don't want
> to apply the Median filter to the good data. What I really want to do
> is find a way of only selecting the pixels below a particular value in
> the line and apply the Median filter to those pixels only.
>
> Any ideas how I can do this, or any other approaches which might do
> the same thing?
My suggestion:
1. Marque select tram line
2. color range select shadows
3. edit selection using quick mask to eliminate unaffected/undesired part of
selection
4. create new layer from selection (new layer via copy or control J)
5. choose layer blend mode darken and move tool
6. move a couple of pixels with arrow keys
Good luck,
Bob Wright
>
> (Incidentally, I did a scan of a piece of opaque card in the slide
> holder with same exposure settings, to get a CCD anomaly scan, and
> subtracted this from the main scan. This removed the lines nicely
> from the shadow areas but ADDED a new line in the highlight areas!
> This seems to backup my conclusion that the CCD anomalies only affect
> a limited range of low values.)
>
> TIA,
>
>
>
> Al Bond
>
>
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