Re: [Gimp-user] help & gray threshold

[Thomas Widlar <twidlar yahoo com>]

I got it done, Steve. It worked the first time. I used the Tools > Color Tools > Curves method with the value 
x=141 and y=64, the dot near the middle horizontally and 1/4 of the way up. The staff lines became considerably 
darker.

Thank you very much.



On 1/17/2013 8:39 PM, Steve Kinney wrote:
> On 01/17/2013 07:42 PM, Thomas Widlar wrote:
> > 1. I've just downloaded and installed GIMP and GIMP help system for Win7. When I hover over the action 
> > buttons or options, I'm told to press F1 for help, but no help comes up. What do I need to do sto connect 
> > GIMP to its help.
> >
> > 2. My first task is to upgrade some music pages for a composer. He has grayscale PDFs. The music scanned well 
> > but the horizontal staff lines are a light grey, clear but light. How do I make any pixel darker than certain 
> > threshold value black? How do I set that threshold?
> >
> > I have no experience with GIMP, just some minimal experience with MSPAINT. But I'm happy to learn.
> Wow, you are starting from "ground zero" here!  But that means
> things can only get better - and better, and better.
>
> First thing is to open your PDF files in the GIMP.  You did not
> mention a problem with this but if there is one, you might have to
> install and configure Ghostscript.  If so, see:
>
> http://sourceforge.net/projects/ghostscript/
> http://registry.gimp.org/node/25039 [for this purpose EPS = PDF]
>
> The Threshold tool, for converting grayscale (or other) images to
> 2-color black and white is at:  Tools > Color Tools > Threshold
>
> Also of interest, a much more subtle tool is the Color Curves one,
> at Tools > Color Tools > Curves.  Dragging the diagonal line down at
> a point 1/3 of the way in from its left end, and dragging it up 2/3
> of the way from its left end, will make the contrast between dark
> and light regions much stronger - play with it to see what it can do.
>
> At the top of the Threshold and Curves windows you will see a drop
> box labeled "Presets."  This stores a history of past adjustments.
> When you find a setting that is "just right," you can reload it by
> using this drop down list and selecting the one you want for e-z
> consistent results.
>
> And another thing to get used to:  If you do File > Save, the GIMP
> will save your file as an .XCF file, which is the GIMP's own native
> file format.  To "save as" a PNG, JPG, etc., do File > Export.  In
> the dialog that comes up, you can choose the format to save your
> file in just by naming your file with the correct extension, i.e.
> "example.png"  The GIMP will present the options for saving the file
> - i.e. compression / quality, embedded comment if any, etc.
>
> GIMP 2.8 is a fairly new release, and a lot of the newer features
> don't have help menu entries yet.  On the other hand, you will find
> a lot of very useful tutorials on YouTube.  And of course, if you
> are really stuck, you know where to ask.
>
> Welcome to it!
>
> :o)
>
> Steve
>
>
>
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