On Tue, Dec 16, 2008 at 12:04 PM, Noel Stoutenburg <mjol...@ticnet.com> wrote:
> Friends:
> A bit of help, if you would...
> I had access to a microfilm of an old (~400 years) manuscript of music,
> from which I was able to make usable scans, which I am not in the
> process of reviewing. Some images (cf.
> <http://users.waymark.net/mjolnir-dsl/10b1.tif>)are quite easy to work
> with; others (cr. <http://users.waymark.net/mjolnir-dsl/12T1.tif>) are
> bit more challenging. The challenging images generally have all the
> information in them I need, but that information is in pixels in a
> mid-gray tone surrounded by darker pixels, as the pixels in the vicinity
> of GIMP co-ordinates 726,110.
> What I'd like to do is to use the "select by color" tool to select the
> pixels with the desired mid-gray values, and then use them as a mask.
> However, when I try to use select by color, it picks up the mid-gray
> pixels well enough, but picks up all the darker ones and some of the
> lighter ones as well. Is there a way to adjust the tool so that it
> selects just the mid-gray values that I want, or is there a better tool
> to use?
You might try adjusting the threshold downwards.

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