scanner and Photoshop skills?

You may recall that some weeks ago I put on the web the text of two
articles from way back in 1967, when three mainstream magazines ran
stories about soaring. I just received a copy of the third magazine,
National Geographic, and the article is wonderful. I can't wait to put
it on the web. The pictures are gorgeous.

And that's the problem. The Geographic's magazine people in their
wisdom laid out the photos in funky ways, letting some bleed right to
the edge of the paper and splitting others across the spine of the
magazine. Now, I can cut open the magazine and scan the loose pages to
get every last pixel of every picture, but I don't have a good way to
put the split pictures back together again. With the tools I have, I
expect I would leave visible seams.

Does anyone have a good scanner and the Photoshop skills to do better?

Johan Larson

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And that's the problem. The Geographic's magazine people in their
wisdom laid out the photos in funky ways, letting some bleed right to
the edge of the paper and splitting others across the spine of the
magazine. Now, I can cut open the magazine and scan the loose pages to
get every last pixel of every picture, but I don't have a good way to
put the split pictures back together again. With the tools I have, I
expect I would leave visible seams.

Does anyone have a good scanner and the Photoshop skills to do better?

Johan Larson

If you can't get a volunteer, I would think that the 'panorama' programs
available for stitching together a range of photographs should work -
several free ones, and trials available on the web, or there was a free
Serif one on the cover disc of PC Plus this month (UK).

Keith

I would be glad to help. This can easily be done in Photoshop...the
quality of the result just depends on how good the scanner is. Just
mail ) me the scans and I will se what I can do.

A panaorama stitching tool is not necessary because it is only required
to get rid of lens distortion which does not occur in scans.

alex8735 wrote:
I would be glad to help. This can easily be done in Photoshop...the
quality of the result just depends on how good the scanner is. Just
mail ) me the scans and I will se what I can do.

A panaorama stitching tool is not necessary because it is only required
to get rid of lens distortion which does not occur in scans.

Excellent. My scanner should get here sometime next week; I'll send out
the scans shortly thereafter. You want the highest-density scans
possible, in original bitmap rather than JPEG form? Those are going to
be some big files; the scanner claims 1200 dpi, and some of the
pictures are full pages.

Johan Larson

High resolution is always good. The files do not necessarily have to be
bitmaps. Best quality jpeg files should not have any visible quality
drawbacks....but I don't mind big files either.

For the best possible scans you should scan in the nativ resolution of
the scanner (no interpolation to higher or lower resolutions). Any post
processing by the scanner or its software should be turned off (like
color correction) because Photoshop is better at it;-)

If you plan to publish on the web, you need not bother with the great
size of files your scanner's full resolution will produce. 72 dpi is
about right for the end product you will need although since you are
going to edit in Photoshop maybe scanning at 150dpi and then scalling
down in photoshop will produce better end results.

In any case, you will be scaning from magazines and if you consider
that the top limit for any such source will most probably never exceed
300dpi (which is the max that wil have been used at the printer's
originally) you should not really concern yourself with more than that.

I would only use higher resultion than this if I were scanning a high
quality original photo print or negative.

wrote:
alex8735 wrote:
I would be glad to help. This can easily be done in Photoshop...the
quality of the result just depends on how good the scanner is. Just
mail ) me the scans and I will se what I can do.

A panaorama stitching tool is not necessary because it is only required
to get rid of lens distortion which does not occur in scans.

Excellent. My scanner should get here sometime next week; I'll send out
the scans shortly thereafter. You want the highest-density scans
possible, in original bitmap rather than JPEG form? Those are going to
be some big files; the scanner claims 1200 dpi, and some of the
pictures are full pages.

Johan Larson

Re resolution: The most important point is that you're scanning a
printed picture, i.e. a screen. Depending on what you intend to do with
your scan, there is a big chance that the result will show an unsightly
moiré pattern.

If your scanner software has an "unscreen" feature (the name of this
function varies with the software), then check it and insert the screen
frequency (probably 150 lpi for a magazine). With some programs, this
function works as advertized, sometimes it does not. If it does and you
don't want to enlarge the picture, there's no point in scanning with
more than 300dpi (or even 72 dpi for monitor display).

If your scanner software doesn't have this function, then things can get
tricky. Usually you'll get the best the results scaning with very high
resolution and downscale afterwards. This approach requires a bit try
and error.

For post processing it is important to have a high resolution. This has
nothing to do with the final result which of course has to be smaller
to fit the screen in the end.

By the way, screens do not have a fixed resolution of 72dpi. Most
screens nowadays will be running near 100dpi but this depends on the
resolution set by the user. The term dpi only really applies to
printing.

I am quite sure that National Geographic prints at a higher resolution
than 300dpi (my printer at home does 600dpi).

I still recommend not to use any kind of scanner demoiré features
because scanner software usually is not as good as Photoshop. Each
post processing step takes information from the original leaving less
options for the guy putting it all together in the end.