Removing grey cast after scanning with Photo Impact

L
Posted By
Luke
Oct 10, 2004
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1079
Replies
6
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Closed
After scanning a B&W photo with photo Impact and my Memorex 48U scanner. I get a grey cast over the photo and when i go to Print a grey cast is left on the paper.
how do i get rid of that grey? TIA

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T
tacitr
Oct 10, 2004
After scanning a B&W photo with photo Impact and my Memorex 48U scanner. I get a grey cast over the photo and when i go to Print a grey cast is left on the paper.

Most likely, there is no "grey cast"–the idea of a "grey cast" in a B&W photo
makes little sense. What you’re seeing is the fact that the contrast is too low.

The right way to fix this is to use your scanner software’s advanced controls to set the hilight and shadow point appropriately. If you don’t want to re-scan the image, use the Curves command to increase the contrast.


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S
Stuart
Oct 11, 2004
Tacit wrote:
After scanning a B&W photo with photo Impact and my Memorex 48U scanner. I get a grey cast over the photo and when i go to Print a grey cast is left on the paper.

Most likely, there is no "grey cast"–the idea of a "grey cast" in a B&W photo
makes little sense. What you’re seeing is the fact that the contrast is too low.

The right way to fix this is to use your scanner software’s advanced controls to set the hilight and shadow point appropriately. If you don’t want to re-scan the image, use the Curves command to increase the contrast.

What about just using the "brightness/contrast" option, or does adjusting the curves give a better result?

Stuart
T
tacitr
Oct 11, 2004
What about just using the "brightness/contrast" option, or does adjusting the curves give a better result?

The "brightness/contrast" command should not be used on any image you actually care about. Photoshop’s "brightness/contrast" and "color balance" commands are only there for novices who don’t want to take the time to learn Levels or Curves and don’t care about quality; they are "linear" commands, which means they degrade the quality of the image by removing detail from the hilights and/or shadows of the image.

Curves can do absolutely, positively everything that Brightness/Contrast and Color Balance can do, but Curves is a "nonlinear" command; it does not degrade image quality by clipping image detail.


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S
Stuart
Oct 11, 2004
Tacit wrote:

What about just using the "brightness/contrast" option, or does adjusting the curves give a better result?

The "brightness/contrast" command should not be used on any image you actually care about. Photoshop’s "brightness/contrast" and "color balance" commands are only there for novices who don’t want to take the time to learn Levels or Curves and don’t care about quality; they are "linear" commands, which means they degrade the quality of the image by removing detail from the hilights and/or shadows of the image.

Curves can do absolutely, positively everything that Brightness/Contrast and Color Balance can do, but Curves is a "nonlinear" command; it does not degrade image quality by clipping image detail.

In retrospect I don’t use brightness/contrast on images I care about, I use it to better define a black and white scanned line drawing for digitising.

Stuart
T
tacitr
Oct 11, 2004
In retrospect I don’t use brightness/contrast on images I care about, I use it to better define a black and white scanned line drawing for digitising.

For an image that’s intended to be bilevel (all black or all white), there is no hilight or shadow detail, so the fact that the Brightness/Contrast command clips hilight and shadow detail is irrelevant. 🙂


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Stuart
Oct 12, 2004
Tacit wrote:

In retrospect I don’t use brightness/contrast on images I care about, I use it to better define a black and white scanned line drawing for digitising.

For an image that’s intended to be bilevel (all black or all white), there is no hilight or shadow detail, so the fact that the Brightness/Contrast command clips hilight and shadow detail is irrelevant. 🙂

I said black and white but was referring to greyscale. Anyway I understand what you are saying.

Stuart

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