Thank you Art for your deep reply.
Best regards,
Dave
Arthur Entlich wrote:
>
> Common wisdom is that scanning at the highest optical resolution and
> then downsampling via a good program provides better results.
>
> But, I would suggest the obvious, which is try both. There are a few
> reasons why I suggest testing (and they are not to be snide). Different
> scanners deal with lower than optical res scans differently. Some
> always use software to downsample rather than just select spaced sensors
> on the CCD, some only use actual sensors data with certain resolutions
> (see below for more on this). Further, the type of image alters the
> result. Line drawings or images with high contrast edges and fine detail
> usually do better to be scanned at native optical resolution and
> downsampled in something like Photoshop. But even that needs to be
> qualified. As nice as bicubic downsampling is (and it is for most color
> images), for some images "closest neighbor" creates a more accurate
> result.
>
> Some images might look better with the scan directly from the scanner
> (especially if you scan at a resolution which is an even divisor of the
> scanner's native (optical) resolution.) Of course, this depends upon
> the scanner firmware/software but a 4000 dpi optical scanner should be
> able to produce a 500 dpi scan without using any interpolation, simply
> by reading every 8th sensor on the CCD. Asking for a 450 or 550 dpi
> scan might force the scanner to do an interpolative scan which might not
> be as good as a downsampled scan in photoshop.
>
> In your case, I honestly believe doing the empirical tests will provide
> you with a much better answer than I can.
>
> Art
>
> David wrote:
> >
> > If you want to put a picture in your web with 500 pixels wide,
> > what is better? Scan at full 4000 dpi and resample to adjust
> > your image at this size (letting PS discard pixels) or scan
> > at this size. I suppose the first choice but I am not very
> > secure. ;-(
> >
> > Best regards,
> >
> > Dave
> >
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