The transparency of Smoke is very different by a preview and

[sitnisati]

Hello,

Thank you for the report and files.
I did a test with Scanline renderer and the results seems pretty close (please see attached image).
Have you rendered it with VRay maybe?
Preview Window can hardly be exactly as the Scanline rendered output.
As for the CPU PW, we will look into this as it shouldn't be so different.

Best regards,
Kresimir Tkalcec