Originally posted by philip
no no, no need to mess with the texture, sounds like its resolution is high enough.
just move your camera closer to the object so you don't render empty space which you crop later. Up the AA to at least medium (turn adaptive OFF).
In the Global Illumination settings increase the RPE (Rays Per Evaluation); I'd suggest 4x12 and monte carlo turned on for this image.
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thanks for the info philip, I'll give it a try...