new curve editor for photoshop
2002-01-07 by Thomas Fors
After reading several of Paul Roark's posts on creating curves in photoshop,
I tried my hand at it and came to the conclusion that I could write a better
tool for editing curves. I've just completed the initial "beta" version
(read I just got it working) and have posted it for download here:
http://www.fors.net/curves/curvaceous.exe
There is also a jpg screenshot in the same directory there.
Sorry MAC people, but I can only write software for the PC.
It reads and writes photoshop curve (.acv) files, so you can load your
existing curve files and modify them as well as creating new ones. Once you
save them, they can be loaded into photoshop.
Here are some tips:
-- Add a point by clicking on the curve between other points.
-- Move an existing point by clicking and dragging it.
-- Delete a point by right-clicking on it.
-- You can also fine-tune a point by clicking either on it in the graph or
on it's entry in the numerical table.
Then you can either type new values directly in the table, or use the
arrow keys to move the point in unit steps.
Following the example set by Paul, the program is free for any use. I hope
it will make it easier for more people to create curves for their
printer/paper/ink combos and in turn provide them for others to use.
I'd be happy to hear any suggestions you have for improvements. Some ideas I
have for the next version are:
-- Ability to print curve and data points to a printer.
-- Undo
-- I used the same curve algorithm that photoshop uses (natural cubic
splines) which has the drawback that anytime you move a point, it affects
more of the curve than just the local area that you're adjusting. It may be
possible to use a better algorithm for making the fine-tune adjustments
without affecting so much of the curve and then have the program fit the
appropriate points that photoshop needs to describe the curve.
-- Some method of having the computer automatically tweak the curve based on
a scan of a printed step wedge.
--Tom