Hi Roger,
You might have thrown it away... it depends.
In Photoshop, for example, it depends on whether you resample or not when
reducing dpi. If you do *not* resample, then the image will "grow larger"
(in inch x inch or cm x cm dimensions) when you "sample down" from 2700,
say, to 96 dpi. If you *do* resample when reducing dpi, then the image size
stays constant, and lots of information goes away.
BTW, anything over about 96dpi for the web is likely a waste of time. Most
monitors can't handle resolutions higher than that. Macs, unless they've
changed in the past few years, do everything (display-wise) at 72dpi.
When setting up images for the web, I usually do all edits and adjustments
at full scanned resolution. The I reduce from the film scanner's scanned
image of 2700dpi to 96 *without* resampling. Then resize/resample for the
pixel dimensions I'm after. Then I do any unsharp masking, and finally I
save to JPG trying different compression settings to balance image quality
against file size.
---
Scott Gomez
-----Original Message-----
From: Roger Wesson [mailto:roger@xxxxxxxxxxxxxxxxxxxxxxx]
Subject: Re: [OM] PNG? was: Photo Editing for Dummies
I was pretty sure that was a case, but I just began to have a horrible
feeling that I might have thrown away a tonne of image information
without realising it, and that I might need to scan in all my photos
again - not a nice thought! Thanks to everyone for the info.
Roger
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