It's on my list of things to do. I'll try to take a look at it today. Some quick thought on how to generate similar effects below. Anyone else feel free to chime in.
Creating a circle brush nib for painting is pretty simple. You just use a path length of 1 and a simple default computational source brush.
Many presets use a paint fill setup fill from set to the paint color, and the fill to set to the canvas with a blend, so that will draw the source nib with solid color in the center and smoothly blending to the canvas at the edges. You want hard edges, so you might want to use the Fill Option set to 'from', which just uses the fill from setting and will give a hard edge to the circle. The reinitialize paint synthesizer macro edit (an edit menu in 3.5, accessed via the paint synth macro edits help viewer link in v4) will give you a hard edged fill from paint preset, so you could just run that and then set the path length in the path shape control panel to 1.
If you setup your paint preset for tiling, then you could run multiple passes with different sized circular brushes to build concentric circles. You could modify the paint coloring in the paint Color Source control panel for the the subsequent passes, using opponent or offset colorings to build the different color concentric circles.
The preset i posted recently or interactively building photo mosaics on variable sized grids shows how to work with the tiling parameters. So you'd use a similar approach but work with variable sized solid color circles instead.
Or as i mentioned before, you could build a movie brush of variably colored concentric circle images and then use the photo mosaic preset i just mentioned with that concentric circle movie brush as opposed to the graffiti movie brush it uses.
Here's one simple example of a paint synthesizer preset that generates flat colored circles. By running the preset multiple times you get the multi-colored inner circles.
By varying the max brush size in the bush modulation control panel you can change the sizing and run multiple passes if you want. Hand painting at smaller sizes in specific areas is a good way to build up detail.
You can also adjust the Path Application Spacing if you want to shrink down the tiling spacing. Again, judicious usage of adjusting this parameter while doing some interactive drawing in specific detail areas is how you could artistically fine tune your final image, which i'm not doing here.
This preset could easily be modified so it generated a colored ring with a see through center.
The generation of the coloring variation on subsequent passes is actually pretty interesting and may be somewhat mysterious to beginning users, it's a function of how i'm working with the Dither Fill Option in the Paint Fill Setup control panel.
Here's a different example showing off a totally different approach that easily generates concentric circles with clear space for showing through the already painted canvas.
This particular example is generated using vector painting in the paint synthesizer and was then output to a pdf file. An advantage of this kind of approach for a commercial artist is that you can then print the resulting file at any printer resolution since it's composed of vectors, or just pass on the pdf file for inclusion in ad copy.
I knocked these examples off fairly quickly and I was not trying to be particularly artistic, but i hope it makes things clear that Studio Artist is extremely flexible and you can easily create a wide range of different stylistic effects, concentric solid colored circles in this particular example, but there are an infinite number of different stylistic variations you could dial in instead.
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Image sequence built with individual images pulled from the Variation 18 video posted on Facebook, the images are being used based on the viewers' reaction.
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