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R
Robin Sh
Participant
January 31, 2020
Answered

Adjustments wont take on Scanned Documents

  • January 31, 2020
  • 2 replies
  • 765 views

I'm trying to make adjustments to scanned (tried 2 different kinds of scanners) images for print, and none of the adjustments "take" no matter what I do. The only way I can make them stay is if I change the resolution to 72dpi which is no good for me as I need them at least 200dpi to print.

I have tried:

Flattening the scanned art

Resaving the scanned art in a different format

Changing the color modes

Releasing the clipping mask in Ai and copy+paste into photoshop on a new document

Scanning on different color modes

Scanned at different formats

Merging the art onto a blank layer

Making 72dpi at the resampled size

Changed the bit depth from 8 to 16

Changed the opening format from pages to images

and probably a bunch of other things that I can't remember

 

Basically, nothing I do will allow me to make adjustments to the scanned images at 300dpi or equivilent.

I'm at a loss. Can someone at least tell me WHY scanned documents are not able to be adjusted? This is really frustrating.

 

 

 

 

This topic has been closed for replies.
Correct answer Robin Sh

Yes, they are screenprint separations. But you did give me a clue! When I zoomed in on the PDF it looked even more clearly like a bitmap image and the adjustments didn't show at all. So I tried it with my grayscale TIFF scan and it did take! It just didn't seem like it because it did not hold the adjustment as much as it showed on the preview (i.e., adjustment is very light, when I press OK it goes darker again but not as dark as the orginal) which is weird but at least now I can make adjustments. Thanks for that little clue, at least now I can work with it. Thank you!

2 replies

D Fosse
Community Expert
D FosseCommunity Expert
Community Expert
January 31, 2020

View at 100% before committing the adjustment!

 

This is obviously line art, or images with a halftone screen (dots).

 

Adjustment previews are calculated based on the on-screen zoom ratio, for performance reasons. This means you see a preview based on a downsampled and softened version. All those halftone dots get blurred to a middle tone, and the adjustment seems to have an effect. But it doesn't on the full data.

 

Tonal adjustments have no effect on pixel values that are either 0 (black) or 255 (white).

 

Always view at 100% to judge previews.

R
Robin ShAuthorCorrect answer
Participant
January 31, 2020

Yes, they are screenprint separations. But you did give me a clue! When I zoomed in on the PDF it looked even more clearly like a bitmap image and the adjustments didn't show at all. So I tried it with my grayscale TIFF scan and it did take! It just didn't seem like it because it did not hold the adjustment as much as it showed on the preview (i.e., adjustment is very light, when I press OK it goes darker again but not as dark as the orginal) which is weird but at least now I can make adjustments. Thanks for that little clue, at least now I can work with it. Thank you!

Bojan Živković11378569
Community Expert
Bojan Živković11378569Community Expert
Community Expert
January 31, 2020

Digital image is digital image regardless of the way it is created. There is nothing wrong with pixel per inch resolution it will not affect anything inside Photoshop. Can you post some screenshot with panels and entire screen in Photoshop visible? I am a bit confused here what is really going on. Problem has nothing to do with fact that image is created using scaner.

R
Robin ShAuthor
Participant
January 31, 2020

I figured it out. I figured it had to be something about the scan settings.

 

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