RE: [APML] Photoshop image scaling; was: Dumb question time

["R. Scott Ireland" <ireland@gate.net>]

Hi Bert,

> maybe I'm missing something, but unless I start with a
> resolution that
> permits Photoshop's Scale to Fit Media to reach the paper
> dimensions without
> dropping much below 200 to 300 ppi, I get a very blocky result.

You're not missing anything.  That's the point exactly.

What we are really talking about here is how to determine the least number
of pixels needed to make a good looking print of a given size.  The
traditional rule of thumb has been to maintain 250 - 300 ppi at your print
output size for maximum quality.  Craig indicates that this number may even
be as low as 150 ppi.

If the ppi drops below whatever threshold you decide works for your printer
and your eyes, then you must re-sample to maintain reasonable quality.
Photoshop's bicubic resampling works very well in this regard (checkbox
found in the image size dialog).

As I mentioned earlier, and Craig mentioned it too,  it is probably better
to make your paper size changes in the image size dialog box (keep
"constrain proportions" on) and not use the "scale to fit media" function,
as this may distort the image somewhat.

Also, I would not recommend applying unsharp masking or grain reduction
until you have done your resizing.  In the event you do have to re-sample,
this should give better results.

Best regards,

Scott

website:  http://www.rsiphotos.com/
email:  ireland@gate.net



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