> I haven't followed these threads at all. But I now
> have to scan some slides.
> I was going to by a Nikon Coolscan for work, but
> this bloke at work showed
> me some stuff he scanned with a flatbed from slides.
> The resolution was 300
> dpi. He then kept zooming in and the results looked
> great until zoomed in a
> lot (I forget the exact amount, but is was big).
> Only then did it start to
> show pixelation. What am I missing?
Scanning a slide at only 300 dpi will give you no more
than a 450x300 pixel image. This won't give you even a
4x6" print that comes close to wet process quality for
a normal photograph.
> Also, he said jpeg is a mathmatical representation
> of the image, not the
> image itself. And it is the same quality as the
> original. So with no
> compression selected, jpeg will be about 1/8 of a
> tiff file. Increase
> compression, and the trade off with image quality
> happens quick. Resave, and
> it recomputes and quality drops.
I'm pretty sure that JPEG is never 'lossless' and so
is never 'the same quality as the original', but I
know for sure that at 8:1 compression it is NOT
lossless. Its true that compression artifacts are not
bad at the 1:8 level, it just depends on your eye.
Chip Stratton
cstrat@xxxxxxxxx
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