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Author Topic: Removing yellow background from scanned PDF  (Read 3781 times)

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Offline teddy_grizzly_bear

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Removing yellow background from scanned PDF
« on: Thursday, February 26, 2015, 01:53:08 AM »
Has anyone got any experience with this?

Should I do something when scanning them (are there settings for this? I don't know) or can it somehow be post-processed?

The yellow is there quite clearly in the original sheet music. It's from the 80s.

I'll also add a page from the pdf. Pardon the upside down and weird language.

https://www.dropbox.com/s/4kj90w7hnyy6hyj/scan.pdf?dl=0

Any help would be appreciated.
<image removed due to imgur stuff - probably for the best>

"Mathematics may be defined as the subject in which we never know what we are talking about, nor whether what we are saying is true." Bertrand Russell

Offline Spanky

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Re: Removing yellow background from scanned PDF
« Reply #1 on: Thursday, February 26, 2015, 02:03:51 AM »
For a document like that, try scanning in either greyscale or monochrome. Monochrome may be too coarse but greyscale will leave a grey background.
It's like shaving your pubes to make your junk look bigger.
Might look bigger, but it aint.....

Offline ELiZ

Re: Removing yellow background from scanned PDF
« Reply #2 on: Thursday, February 26, 2015, 02:20:38 AM »
If that don't work, the only option I can think of is loading up the pdf in Photoshop, and apply "Levels".
You'll loose some detail, look here:


I'm guessing there are filters in PS that can improve the quality.

Offline ELiZ

Re: Removing yellow background from scanned PDF
« Reply #3 on: Thursday, February 26, 2015, 02:31:22 AM »
Here is the second try:


This time I converted the image to grayscale before adjusting the levels.

Offline teddy_grizzly_bear

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Re: Removing yellow background from scanned PDF
« Reply #4 on: Thursday, February 26, 2015, 03:19:53 AM »
OMG Awesome! :)

Too bad I don't have photoshop and there's 20 pages alltogether :(

I'll try to get PS at a later date (no time today).

But if you have the spare time, you can do all of them and I would be ever so grateful!
https://www.dropbox.com/s/9ezmaj77kuu51w8/Reekviem.zip?dl=0
<image removed due to imgur stuff - probably for the best>

"Mathematics may be defined as the subject in which we never know what we are talking about, nor whether what we are saying is true." Bertrand Russell

Offline ELiZ

Re: Removing yellow background from scanned PDF
« Reply #5 on: Thursday, February 26, 2015, 05:11:53 AM »
I'm uploading a fixed version, I'll be back from lunch in 30 minutes, I will post the link then.

Offline ELiZ

Re: Removing yellow background from scanned PDF
« Reply #6 on: Thursday, February 26, 2015, 05:14:20 AM »
You got lucky, upload was done before I went out:
https://www.dropbox.com/s/yemmo75rejgffcf/Output.zip?dl=0

Offline teddy_grizzly_bear

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Re: Removing yellow background from scanned PDF
« Reply #7 on: Thursday, February 26, 2015, 05:53:22 AM »
Love you long time, my man!

I don't know how I can thank you for that!
<image removed due to imgur stuff - probably for the best>

"Mathematics may be defined as the subject in which we never know what we are talking about, nor whether what we are saying is true." Bertrand Russell

Offline -Vegeta-

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Re: Removing yellow background from scanned PDF
« Reply #8 on: Thursday, February 26, 2015, 07:38:45 AM »
photo shop free dl on yt. Or it used to be :)
Words are great possed but the tune is crap. A condeming fear strikes down
Things they cannot understand. An excuse to cover up weaknesses that lie within Lies
Laying your guilt and pain. On people that had no part in the molding of a life
That creates its destruction. Lies. Right before your very eyes
A reflection of the mistakes. To the end you will deny. Your part in the demise of a life
Lack of comprehension. Thriving on your cliche. Compelled by self-resentment
Reaching into the minds of those that created. The depression in which they
In which they drowned their flesh and blood. Lies. So easy to blame the
Everlasting fear on a pathetic attempt. To justify the ending of life. Lies
Right before your very eyes. A reflection of the mistakes. To the end you will deny
Your part in the demise of a life
Lack of comprehension. Thriving on your cliche. Compelled by self-resentment

Offline teddy_grizzly_bear

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Re: Removing yellow background from scanned PDF
« Reply #9 on: Thursday, February 26, 2015, 07:51:07 AM »
photo shop free dl on yt. Or it used to be :)
I don't know what you're talking about here exactly.

You can officially get a 30 day trial of Photoshop, I believe.

And it is, of course, possible to obtain programs illegally as well, if that's what you're talking about.
<image removed due to imgur stuff - probably for the best>

"Mathematics may be defined as the subject in which we never know what we are talking about, nor whether what we are saying is true." Bertrand Russell

Offline ELiZ

Re: Removing yellow background from scanned PDF
« Reply #10 on: Thursday, February 26, 2015, 07:57:12 AM »
Love you long time, my man!

I don't know how I can thank you for that!
Can I delete the file from dropbox?

Offline teddy_grizzly_bear

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Re: Removing yellow background from scanned PDF
« Reply #11 on: Thursday, February 26, 2015, 08:07:16 AM »
Can I delete the file from dropbox?
Yes. Thanks, again man!
<image removed due to imgur stuff - probably for the best>

"Mathematics may be defined as the subject in which we never know what we are talking about, nor whether what we are saying is true." Bertrand Russell

 

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