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Hi [USER=128661]@NoName[/USER]

I tried a couple approaches and they both help a bit yet I don't know how perfect it needs to be.

So after fixing the transparency edge issues (which could be done as the first step or the last step),

Add a Posterize Adjustment to ~4.  This will reduce the number of total colors and it will look less anit-aliased.  There is some color shift as well.

To reduce the color shift, you can add a copy of the original image above the Posterize Adjustment Layer and set the Blend mode to Color

That gave some decent results

The second approach after you have taken care of the edge transparency is the use Save for Web and set the output format to PNG 8 (instead of 24).  It brings up a table where you can select the number of colors and set the number to powers of 2 up to 256.  It looked pretty good when I set it to 16

You save the PNG 8 file and read it back in and resave as PNG24 if you prefer that format.

Let me know if that is good enough

John Wheeler