How can I scan half tone images?

  • Thread starter Thread starter Laidman
  • Start date Start date
L

Laidman

I have a set of good images which are already half-tones (screened
images?). When I try to scan these, they come out a mess...all mottled
and spotty.
Anyone have any suggestions as to how I can scan these?
Thanks.
 
That's called moire. Try scanning them on the diaganol, and use the
anti-moire setting in your software if it has it (Epson's TWAIN, for
example, has "color photo" and "color document" settings - the "color
document" deals with moire).

And for more info, read up on moire at Wayne Fulton's excellent website:

http://www.scantips.com/basics06.html

Maris
 
Maris said:
That's called moire. Try scanning them on the diaganol, and use the
anti-moire setting in your software if it has it (Epson's TWAIN, for
example, has "color photo" and "color document" settings - the "color
document" deals with moire).

And for more info, read up on moire at Wayne Fulton's excellent website:

http://www.scantips.com/basics06.html

Maris
Click to expand...
What you want is the De-screening option if your scanner driver has it.
 
Terry" ([email protected]) said:
What you want is the De-screening option if your scanner driver has it.
Click to expand...


Every twain packiage I've had included effective de-screening
capapbilities, more or less blurring the dots together. I've had much
less luck with after-scan attempts to do the same (eg in PSP). Is this
feature lacking in some programs?

Brendan
 
Recently said:
I have a set of good images which are already half-tones (screened
images?). When I try to scan these, they come out a mess...all
mottled and spotty.
Anyone have any suggestions as to how I can scan these?
Thanks.
Click to expand...
What's your intended use for the scanned file? The highest quality result
will be from what's called a "copy-dot" scan. These are used to accurately
capture the dots in your half-tone at the full output resolution of the
imagesetter, platesetter or other output device. The files are then used
1:1 during reproduction.

OTOH, if you just want to have a copy of the photo and don't mind making
it "soft", the descreening algorithms in some scanning software and/or
some image editors will do that. Basically, they fill the empty space
between the dots with shades (or colors) of the dots that are nearest
them.

Regards,

Neil
 
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