Hello,

On Tue, Dec 16, 2008 at 12:04 PM, Noel Stoutenburg 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. )are quite easy to work
with; others (cr. ) 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.

David

Noel Stoutenburg wrote:

Friends:

Where I wrote:

...... GIMP co-ordinates 726,110. ......

I inadvertantly used co-ordinates from the wrong image; in the image

)

the mid-gray tones that contain the useful information are the pixels around 635,134.

ns