Scanning coins advice please?

Scanning coins advice please?

Post by Steven Gibb » Sun, 13 Sep 1998 04:00:00



I've borrowed a Plustek OpticPro 600P
flat-bed scanner to directly scan coins,
but have had poor results so far, especially
when trying to scan Guernsey's mirror-finish
UNC crowns.  Can anyone offer advice on
TWAIN settings to get the best results?

Thank you,
Steven Gibbs - Your contact in Guernsey
--

44 Les Prins, Vale,   http://www.guernsey.net/~sgibbs/
GUERNSEY GY6 8HB      Telephone 01481 57605
via England.          Intnl  +44 1481 57605

 
 
 

Scanning coins advice please?

Post by Andrew W Precht » Mon, 14 Sep 1998 04:00:00


Rotate the coin 90 degrees so that the light does not bunch up at the
top of the design. Cuts way down on that awful color mirrored coins
produce.

Scan mirrored coins in grayscale.

Set the "Gamma" in the driver interface to .7 and readjust the gamma to
the finished scan in your imaging software.

There are many more tricks to be found in the Plustek interface. It
being 10 bit and your imaging software being 8 bit it makes sense to
adjust as much as possible in the Twain interface.

Scan all coins at 300 DPI and resample to the desired finished size.

Compress as much as file size limitations will allow. (very important)

Regards, Andrew

Quote:

> I've borrowed a Plustek OpticPro 600P
> flat-bed scanner to directly scan coins,
> but have had poor results so far, especially
> when trying to scan Guernsey's mirror-finish
> UNC crowns.  Can anyone offer advice on
> TWAIN settings to get the best results?

> Thank you,
> Steven Gibbs - Your contact in Guernsey
> --

> 44 Les Prins, Vale,   http://www.guernsey.net/~sgibbs/
> GUERNSEY GY6 8HB      Telephone 01481 57605
> via England.          Intnl  +44 1481 57605


 
 
 

Scanning coins advice please?

Post by Steven Gibb » Mon, 14 Sep 1998 04:00:00


Thank you Andrew for going into such detail with
so many useful tips.  I've only had the borrowed
scanner for a few days, so I'm a bit new to this.

My intention has been to get a good scan at the
scanning/TWAIN stage, and then to use image
software only to reduce dimensions and resolution
to make for correctly-sized images which don't
take too long to download from my Guernsey
numismatic web pages.  I've already posted two
nice pages of banknote images, but the coin
images you will see there are rather poor.

It's my intention to post a list of Guernsey items
for sale once I've completed the coin & banknote
listings with a good selection of images.  You'll
be able to watch my progress by keeping an eye on
my numismatic pages, reached from my home page below.

I'll let you know when I find a solution to
the problems I outlined.

Regards, Steven Gibbs
----

44 Les Prins, Vale,   http://www.guernsey.net/~sgibbs/
GUERNSEY    GY6 8HB   Telephone:        01481 57605
via England.          International: +44 1481 57605