How do I make this survey map scan easier to read?

Here http://www.preferredcountry.com/Survey.pdf is a survey map scan that I
need to fix to make it more readily readable when it's cropped, compressed
etc. I've tried making changes on a PDF copy, on a PSD version, and on a
JPEG, in each case converting to grayscale, then adjusting the contrast -
the preview shows a significantly more readable image, but when I click on
the OK button to accept the contrast change, the image reverts to its
original contrast - is that normal? (I'm using Photoshop CS). Any
suggestions for how to make the image easier to read (and the final version
will need to have some color, so I'll convert to RGB I guess) would be
infinitely welcome. All suggestions and help acknowledged and VERY
gratefully received.
TIA,
Dan
--
Dan E
webbie(removethis)@preferredcountry.com

Dan E

Re: How do I make this survey map scan easier to read?

The original image you have to work with doesn't appear to be terribly
sharp, so serving the PDF you have is likely to be the best approach.
The image in the link (winona) was made up of many separate large
high-resolution images. (In print form the image be something like 12'
tall.)

Re: How do I make this survey map scan easier to read?

Thanks, J.
Dan

Dan E

Re: How do I make this survey map scan easier to read?

...
Something like this?
http://elearning.winona.edu/ald1/road_trip/big_map/default.htm
Dunno.
Clue me in.

Re: How do I make this survey map scan easier to read?

Many thanks, Mike.
Dan

Dan E

Re: How do I make this survey map scan easier to read?

...
There is a glitch in Photoshop's preview interface. A zoomed out image
containing only pure black and white pixels will appear to respond to tone
adjustments, when in fact it is not.
Unfortunately the images are bitmaps which means that you cannot directly
adjust them using levels or contrast. You can still improve the existing
images somewhat. When converting them to Grayscale, specify a size ratio of
between 2 and 3, which will give you some gray levels to work with. BTW I
recommend that you use Levels instead of Contrast or Brightness for this.
--
Mike Russell
www.curvemeister.com/forum/