Scanning is inconsistant.

PJ
Posted By
Peter Jason
Apr 6, 2007
Views
531
Replies
4
Status
Closed
I use a Canon 9900f scanner to scan documents
into Photoshop. I scan one side of a
document and then the other side.

But the first scan comes out darker than the
second one.

Why does this happen?

Please help, Peter.
Related Tags
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J
jaSPAMc
Apr 6, 2007
On Fri, 6 Apr 2007 15:43:10 +1000, "Peter Jason" found these unused words floating about:

I use a Canon 9900f scanner to scan documents
into Photoshop. I scan one side of a
document and then the other side.

But the first scan comes out darker than the
second one.

Why does this happen?

Please help, Peter.
Because:

The first scan previewed the entire surface, the second was only the area of the first. Auto gets its settings off average of the whole preview area.

To make documents consistent, turn off ‘auto’, scan page 1, then make adjustments as you like. from there until you turn on ‘auto’ (or click the reset) the properties will remain the same.

If one side of the paper is coated and the other not … all bets are off.
T
Talker
Apr 6, 2007
On Fri, 6 Apr 2007 15:43:10 +1000, "Peter Jason" wrote:

I use a Canon 9900f scanner to scan documents
into Photoshop. I scan one side of a
document and then the other side.

But the first scan comes out darker than the
second one.

Why does this happen?

Please help, Peter.

The most common reason this happens is because of the scanner’s lamp. I have a Canon 9950F scanner, and the lamp turns off after a few minutes of inactivity….sort of like a standby mode. When you place a document on the scanner and click "Scan", the lamp comes on and does the scan. You then turn over the document and scan the back of it, but the scanner’s lamp has been on for a few extra seconds. The lamp is warming up, which changes the temperature of the lamp. This affects the lamp’s brightness.
When I use my scanner, I turn off the feature that turns off the lamp when the scanner is idle, and do a preview scan to light up the lamp and keep it lit. I wait a few minutes before doing a scan, that way, the lamp will be warmed up and result in more consistent scans.(this is done in the "Advanced" settings.)

Talker
PJ
Peter Jason
Apr 6, 2007
"Sir F. A. Rien"
wrote in message
On Fri, 6 Apr 2007 15:43:10 +1000, "Peter
Jason" found these
unused words floating about:

I use a Canon 9900f scanner to scan
documents
into Photoshop. I scan one side of a
document and then the other side.

But the first scan comes out darker than
the
second one.

Why does this happen?

Please help, Peter.
Because:

The first scan previewed the entire
surface, the second was only the area of
the first. Auto gets its settings off
average of the whole preview area.

To make documents consistent, turn off
‘auto’, scan page 1, then make
adjustments as you like. from there until
you turn on ‘auto’ (or click the
reset) the properties will remain the same.

If one side of the paper is coated and the
other not … all bets are off.

Well, thanks. We live & learn.
Peter
PJ
Peter Jason
Apr 6, 2007
"Talker" wrote in
message
On Fri, 6 Apr 2007 15:43:10 +1000, "Peter
Jason"
wrote:

I use a Canon 9900f scanner to scan
documents
into Photoshop. I scan one side of a
document and then the other side.

But the first scan comes out darker than
the
second one.

Why does this happen?

Please help, Peter.

The most common reason this happens is
because of the scanner’s
lamp. I have a Canon 9950F scanner, and
the lamp turns off after a
few minutes of inactivity….sort of like a
standby mode. When you
place a document on the scanner and click
"Scan", the lamp comes on
and does the scan. You then turn over the
document and scan the back
of it, but the scanner’s lamp has been on
for a few extra seconds.
The lamp is warming up, which changes the
temperature of the lamp.
This affects the lamp’s brightness.
When I use my scanner, I turn off the
feature that turns off the
lamp when the scanner is idle, and do a
preview scan to light up the
lamp and keep it lit. I wait a few minutes
before doing a scan, that
way, the lamp will be warmed up and result
in more consistent
scans.(this is done in the "Advanced"
settings.)

Talker

My scanner has had a lot of use, but it
always goes thru a "warming-up" phase.

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