Michael Wong wrote:
> http://www.fotop.net/MichaelWong/HK_Flower_Show_2009
>
> Some red Tulip flowers are over vivid upon scanned. Better result in slide
> film >_<
>
Some nice images there.
Your problems with reds are in overexposure. If the slides look fine,
the problem is in the scanning. If you look at the histograms, you will
find that the red channel of some has clipped. IMG3759 is one where
clipping is severe.
It's really easy to overexpose slide images of pure reds in bright
light, too. So it's possible you have a mixture of both problems.
Two things happen when this occurs. Most important, what would be
nuanced graduations of red in the highlights all become the same value,
full red brightness. Thus, they look over vivid and plasticy.
Secondarily, the small amounts of blue and green in the reds are not
clipped, so the color balance is subtly altered in the reds.
The solution is fairly simple. First, scan an image like 3759 with
settings that make sure that the histogram doesn't reach the top, like
setting exposure down. Look at the histogram for the red channel. If
there is a spike at the top end of it, the film has clipped, and you
needed a lower exposure. Exposure meters can be fooled by this kind of
subject. It's good practice when shooting slides of bright red flowers
in bright light to adjust exposure down at least half a stop.
If there's no spike, the film image is OK, and you need make sure your
scanner settings avoid highlight clipping.
Moose
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