Re: [Gimp-user] Cleaning scanned magazine pages

["Rick Strong" <rnstrong primus ca>]

In addition to what you suggest, you might also try putting a sheet of black 
paper under the magazine page you are scanning (between the pages). The 
scanner may give you a better starting image. This has worked for me 
countless times over the years.

Rick S.

-----Original Message----- 
From: MrNiceButDim
Sent: Tuesday, August 29, 2017 9:04 PM
To: gimp-user-list gnome org
Cc: notifications gimpusers com
Subject: [Gimp-user] Cleaning scanned magazine pages

I'm totally inexperienced with GIMP but I chanced upon this recipe that 
would
meet my needs for a rather big project I'm currently doing. It's about 
cleaning
scanned magazine pages where the print on the back side shines through the 
thin
paper making the reading less enjoyable.

Recipe:

With GIMP:

   Open a file.

   Convert your document to grayscale: Image - Mode - Grayscale.

Select the background color: Select - By Color, click with mouse pointer on
the color of the background.

   Invert the selected color: Select - Invert.

   Copy the selection: Edit - Copy.

   Create a new file: File - New.

In the dialog of a new file, in field: Advanced Options choose: Fill with:
White, hit Ok.

   Click anywhere in the window of the new opened document, just to choose 
it.

   Paste the content of a clipboard: Edit - Paste.

Add a new layer to enhance the black text: Layer - New from Visible, in the
layer's palette, in field: Mode: choose Multiply.

   Combine two layers: Layer - Merge Down.

Save the result as a JPEG file: File - Export As, choose jpeg and set the
quality at least 60.

I have a couple of questions.

A. When getting to "Combine two layers: Layer - Merge Down." the Merge Down
option is grayed out so I can't apply that step.

What could be the reason? And why does it say "Combine two layers" when 
there is
three?

1.Floated selection (Pasted Layer)

2.Visible

3.Background


B. When selecting a background color to be erased/turned to white what would 
be
the best way to pick a wider range of grayness than the rather sparse
instruction the recipe suggests "By Color, click with mouse pointer on the 
color
of the background."

--
MrNiceButDim (via www.gimpusers.com/forums)
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