How to create a digital file of a color target

[darlingm]

I'm looking to make my own color target.  I don't mean printing a color target that was designed by someone else - I actually mean designing my own color target.  Is this done by manually creating it in Photoshop, or is there a program you can feed LAB/RGB values to that will generate the patches?  (As a side note, I wrote a program using the Magick++ libraries, but found a few bugs that won't be fixed for a while specifically regarding its LAB colorspace usage.  So, hoping there's something that already exists to do this.)

This is from the tinkering side of me.  I know it's a complex area, and I might not see any results.  I would still like to give it a shot.  I'm most interested in creating my own scanner color target, with more patches, and patches in more areas.  I have an i1 Photo Pro 2 coming in, so will be able to get actual measurements to compare with.

[digitaldog]

ColorPort from X-rite which is free allows you to do this.

[darlingm]

ColorPort from X-rite which is free allows you to do this.

Awesome, thank you so much!