Moose,
Thanks for your comment & advice. Will note & try next time, thanks.
---
Michael
2009/4/1 Moose <olymoose@xxxxxxxxx>
> 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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