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how to adjust [gray scale] density in photoshop?

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Old 05-06-2010, 08:04 PM
pinee pinee is offline
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how to adjust [gray scale] density in photoshop?

I have question, how to adjust density in photoshop.

some copier, (w/ Scanner Function), I used that device to scan "gray scale" dpi.300 .TIFF

after when finish. how to used photoshop doing [density].

because my source paper is that letter is very light color. and A4 paper very wrinkled.


I known as same time that copier can adjust densiry [<<Lighter ...normal... darkeR>>].

but if was used "normal" to done scan, how to goto photoshop again doing [adjuest that density].


Again:
if used [B/W Text] and [density: Darker] to scan. that string is I can't read. Failed.
if used [gray scale] and [density: normal] maybe is look fine,
COLOR is no problem. but SIZE to Large!


please!
http://life.bio.sunysb.edu/ee/comput...mote-scan.html

http://life.bio.sunysb.edu/ee/comput...ote_scan03.jpg

http://life.bio.sunysb.edu/ee/comput...ote_scan04.jpg


http://life.bio.sunysb.edu/ee/comput...ote_scan05.jpg

Last edited by pinee; 05-06-2010 at 08:11 PM.
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Old 05-06-2010, 10:11 PM
Panpan's Avatar
Panpan Panpan is offline
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Location: Gatineau, QC Canada
Posts: 352
Re: how to adjust [gray scale] density in photosho

If I understand you correctly, you have a letter with pale text on wrinkly paper that you want to scan. You then want to use Photoshop to make it more readable and to reduce the size of the file.

I suggest you choose the grey scale, normal density, 300 dpi option. It seems your Photoshop 7 can read this without problems.

There are many ways to make text more readable. You seem to be a beginner in Photoshop, so try simple controls like increasing contrast and brightness. You can increase those values a lot if this is a typed letter. You have to preserve more grey if it is handwritten or in a complicated alphabet. Try to learn more sophisticated controls like Levels or Curve. They would do a better job.

Next you have to change the size of the file. With a 300 dpi scan of A4 paper you should have approximately a 2,500 by 3,000 pixel document. This seems like a sophisticated scanner so it should have autocropped the scan to just cover the size of the letter. If not, you will have to crop the image in Photoshop yourself with the Marquee tool (It should look like a dotted square on the left of the image). Then change the size of the file with Image Size in the Image menu.

Last, save to Jpeg format instead of TIFF. This will make the file a lot smaller.
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Old 05-07-2010, 12:47 AM
pinee pinee is offline
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Join Date: Apr 2010
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Re: how to adjust [gray scale] density in photosho

now, i'm doing this step:

first start photoshop and loading .TIFF image
and doing:

Code:
Image (I) >
...Adjust (A) >
.....Auto contrast (Alt+Shirt+Ctrl+L)

and:

Image (I)
...Adjust (A) >
......Threshold (T) , normal defualt value: 128 is fine!

http://www.online-tech-tips.com/wp-c...-image0045.jpg


http://www.online-tech-tips.com/wp-content/uploads/2008/08/clip-image0063.jpg


Code:
Last used :

Image (I) >
...Mode (M)  >
......Bitmap conversion (B)

selected: 50% Threshold

http://www.cellbio.duke.edu/Faculty/Klingensmith/Adobe%20Photoshop%207/Help/1_6_6_2.html
http://www.cellbio.duke.edu/Faculty/...p/1_6_6_2.html

.done.
I found used "threshold:" , is look fine,

but that "threshold (value: 1-254) is as same as that copier densiry [<<Lighter(1) ...normal(128)... darkeR(254)>>]. ?


please!

Last edited by pinee; 05-07-2010 at 01:00 AM.
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