Quote Originally Posted by markbarendt View Post
Here's a link to a place you can get a proper step wedge http://www.stouffer.net/TransPage.htm

How to do things in PS is off topic here on APUG.
markbarendt is right. Look how "cheap" these transparent step wedges are. They last a lifetime. I've found no other cheap photo accessory as useful as a step wedge - considering how much cost of material and trouble it is to makeshift without one...

But if the idea is a journey to understanding, then any path that gets you there is fine. Just like climbing straight up a rock gets you to the top, same as taking a walk up the backside.

Considering OP wants to make a test pattern for traditional testing, I think it's OK to talk.