[magick-users] Need help with -modulate

[Chris Gentle]

On Sat, Jun 13, 2009 at 4:49 PM, Fred Weinhaus<fmw at alink.net> wrote:
> Using your second image and playing around, seems like you need to
> control the saturation and not the brightness (or both). So the best
> I got was about
>
> -modulate 95,220
>
> Try that and  play around. The second number is the saturation which
> needed to be drastically increased to get close to what you had from
> before. It also needed a bit decrease in brightness.

Thanks for the info.  However, I now see that yellow may have been a
bad choice for my sample files.  I tried scanning a white page and
when I used your suggested values for modulate I ended up with a blue
page.  This kind of makes me think that everything I scan may need a
different value for modulate to make it look like I want.

The nice thing about the previous behavior of the -modulate option was
that I didn't have to tweak with it and it wasn't dependent on what
color page I was scanning.  I actually had a script that did all my
scanning and there was a hardcoded value in it for -modulate and it
just worked.  I really don't want to have to experiment with every
scan I do to find the best option for modulate.

But from what you said in your previous email, there may not be a way
to get back to the previous behavior.  That's bad.  I do a lot of
scanning.

-- 
Chris