object layer color pass halo issue

[johnzapf]

looking for layer mask alternatives due to render times.

interested in a workflow for exporting 10 to 20 mattes per scene using the layer color ID, but I'm having some halo issues when trying to select by color range in photoshop

any tips for getting a clean selection (such as when using layer mask b&w pass)?

here's an illustration/example:
https://imgur.com/1nAcXCQ

thank you