As others have pointed out the color cast appears to be from the
negatives aging.

My first suggestion is to use an artificial light source. The color
temperature of the sky changes all the time. The color temperature of
the artificial light source is not important, only that it stays the
same temperature from first to last.

One of these from Amazon or whatever equivalent source you might find
locally should work:

http://tinyurl.com/h5bc63y

Secondly, I opened the image in Camera Raw and used the white balance
eye-dropper to select a neutral tone. In the image shown, the white cap
on the church steeple back near the viaduct seemed to give the best
results. The sky turned blue anyway.

That may be the easiest way to batch process a group of images from the
same roll of film. Fix the white balance for the first one and then
synchronize the correction for the rest of them.

On 3/5/2017 8:59 AM, Alan C wrote:
I picked up a slide copying attachment for my old M42 bellows with a
view to copying all my slides & negatives. I know you guys all use Epson
scanners but they are very expensive here. I set it up with a Super Tak
55/2 which gives about 90% coverage. 65mm is needed to get 100%.
(Unfortunately I cannot use my K-mount lenses unless I replace the M42
flange with a K-mount one). Anyway, it works fine and as I would
probably crop most of them, 90% is OK. Colour rendition & sharpness are
good. Slides, no problem. However, I am getting yellow colour casts on
the sky with negatives after inversion. Using an 80B filter on the lens
or using the filters in Elements gives more or less the same result.
Shooting RAW or JPEG makes little difference but shooting RAW allows me
to batch process very easily. I used the sky for illumination. I can
easily process 50/hour. Example:

https://www.flickr.com/photos/wisselstroom/33222112546/

Any ideas on getting rid of the colour cast?

Alan C

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