Digital BW, The Print

I find it convenient to store text pages from the occasional magazine
article as a B&W jpg image.  [Rather than storing a bulky stack of
mags]  Trouble is that uneven or dim "convenience" lighting or an
unflat page near the centre staples often causes a grey gradient on
part of the text. This spoils it for OCR or spoils the appearance when
reading it later.
Can Photoshop or similar do something that just leaves black print on
a white page?  ie remove the gradient?

In a message dated 11/21/07 8:47:03 AM, cowpercam@... writes:


> I find it convenient to store text pages from the occasional magazine
> article as a B&W jpg image.  [Rather than storing a bulky stack of
> mags]  Trouble is that uneven or dim "convenience" lighting or an
> unflat page near the centre staples often causes a grey gradient on
> part of the text. This spoils it for OCR or spoils the appearance when
> reading it later.
> Can Photoshop or similar do something that just leaves black print on
> a white page?  ie remove the gradient?
> 

Only at the cost of seriously degrading the text legibility. The better trick 
to to put a black sheet behind the page before scanning, so that there is far 
less back-print bleedthough. If this is a black matte board, it will also 
help flatten the page at the binding, minimizing the gradient at the edge. Then, 
adjust the whitepoint on this better scan, to further improve legibility.

C. David Tobie
Product Technology Manager
Digital Imaging & Home Theater
Datacolor Inc.
CDTobie@...
www.datacolor.com/spyder3


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[Non-text portions of this message have been removed]

I would say it depends on how black your gradient is or dark gray. Of course
the closer to black the worse it will be. Instead of using a gradient you
might try a layers adjustment where the blending option puts a limit of
replacing with white where you OCR software can still function. It might
even help to put a little blur on the layer so that it softens the edge
effects.

 

Eric 

 

Eric Neilsen Photo

4101 Commerce Street, Suite 9

Dallas, TX 75226

214 827-8301

 

http://ericneilsenphotography.com

SKype ejprinter

 

  _____  

From: DigitalBlackandWhiteThePrint@yahoogroups.com
[mailto:DigitalBlackandWhiteThePrint@yahoogroups.com] On Behalf Of
CDTobie@...
Sent: Wednesday, November 21, 2007 11:52 AM
To: DigitalBlackandWhiteThePrint@yahoogroups.com
Subject: Re: [Digital BW] Can I remove shadow gradient from black text on
white page [d/camera images] .

 


In a message dated 11/21/07 8:47:03 AM, cowpercam@yahoo.
<mailto:cowpercam%40yahoo.com> com writes:

> I find it convenient to store text pages from the occasional magazine
> article as a B&W jpg image.  [Rather than storing a bulky stack of
> mags]  Trouble is that uneven or dim "convenience" lighting or an
> unflat page near the centre staples often causes a grey gradient on
> part of the text. This spoils it for OCR or spoils the appearance when
> reading it later.
> Can Photoshop or similar do something that just leaves black print on
> a white page?  ie remove the gradient?
> 

Only at the cost of seriously degrading the text legibility. The better
trick 
to to put a black sheet behind the page before scanning, so that there is
far 
less back-print bleedthough. If this is a black matte board, it will also 
help flatten the page at the binding, minimizing the gradient at the edge.
Then, 
adjust the whitepoint on this better scan, to further improve legibility.

C. David Tobie
Product Technology Manager
Digital Imaging & Home Theater
Datacolor Inc.
CDTobie@datacolor. <mailto:CDTobie%40datacolor.com> com
www.datacolor.com/spyder3

**************************************
Check out 
AOL's list of 2007's hottest products.

(http://money.
<http://money.aol.com/special/hot-products-2007?NCID=aoltop00030000000001>
aol.com/special/hot-products-2007?NCID=aoltop00030000000001)

[Non-text portions of this message have been removed]

 



[Non-text portions of this message have been removed]