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Re: [vox-tech] help with gimp -- contrast of image
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Re: [vox-tech] help with gimp -- contrast of image

> Date: Mon, 27 Jan 2003 16:27:53 -0800
> To: vox-tech@lists.lugod.org
> From: Peter Jay Salzman <p@dirac.org>
> Subject: [vox-tech] help with gimp -- contrast of image
> Reply-To: vox-tech@lists.lugod.org
> questions:
> 1. i'm ignorant of most graphics topics.  is png a good format for this?
>    or should i be using jpeg for this?

I, too am ignorant about file types.

> 2. is there other filters that people use for this kind of thing?  i
>    have a feeling i used the wrong ones, and walking about the gimp is like
>    walking around khazad-dum.  it's huge and very unfamiliar.  help?

Your document has color in it, (in small quantities, but you'll see it
if you look at the individual channels in the curves box) and one of the
goals of your editing has to be to remove the color.

Use the threshold filter. Looking at your document on screen, I think
the threshold range from 235 to 255 (there are two blanks to fill in)
would work well. 

Bear in mind that using the threshold filter is an excercize in making
the lines thick enough to see without introducing too many random black
dots elsewhere in the paper, and that you won't come up with anything
totally perfect, but this method works for me with a good success rate
if I'm not trying to make it look professional.

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