The Plugin Site

I'm looking for a filter that mimics Cokin graduated filters.
Should be adjustable demarcation line up and down.
Should be able to set at percentage of darkening 30%, 50% etc..
Application of different colors, such as tobacco, blue and others.

Should be usable in PhotoShop 7 (I can't use the new Nic programs as they require CS)

I used to love those Cokin filters.

What about the gradient tool in Photoshop 7, Don? You can achieve much the same result without a plug-in ... and tweak it all you like.

Haven't done this but once or twice, but the basic method I've used is to create a new transparent layer above the image, apply the gradient to that new layer and tweak the various settings until you get the right combination of transparency and color (subtle additions of color are usually better). Takes a little trial and error, but it should give you what you want.

You could also record this procedure as a macro and save it in your "actions," and keep it available as a ready-made filter for future use.

See
http://thepluginsite.com/resources/plugins.htm#Gradient

or directly
http://www.chromasoftware.com/photographic_filters.htm

I purchased several, actions and plug-ins.

Chroma came closes to actual usage of Gradient types of Cokin filters.
However I found their actual instructions for downloading and using a little on the needy side.

Their support however is rapid and responsive. I hope they get their user forum working as good as the Plugin sites (They look similar).

Don. You might try this site Virtual Photographer from optikVerve Labs