i use picnik.com but its the same principle.. i use saturation which will pull the color out or see if there is some.. and contrast.. then I also use exposure as well.. temperature can help to decrease the background pink of the test
If i see a lot of "other" color I will use sepia as it masks the pink background.
Hope this helps
Mostly its just an art form, you have to play with it until you figure out which things will enhance the line the best
I use photoshop. I open the picture in full edit, then up in the "Filters" tab, you can go to "Filters" then "Adjustments" and you can invert it from there. I like to play around with all the filters to see which filter you can see it best with.
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