Weird warning when rendering in Arnold

[Anonymous]

Hey guys, sorry I'm a bit of a newb. I'm trying to render a scene with Arnold, and I keep getting spammed with this message in the output window, and the render is incredibly slow: libpng warning: iCCP: known incorrect sRGB profile

[mspeer · Accepted solution]

Hi!

1. Update Arnold to the lastest Version. https://support.solidangle.com/display/A5AFMUG/2.0.0

2. Try a reset of your preferences.
Rename the folder prefs in folder 2017 to something like prefs_backup, or to reset everything, the folder 2017 to 2017_backup. Maya creates new folders. Detailed at:
https://knowledge.autodesk.com/support/maya/troubleshooting/caas/sfdcarticles/sfdcarticles/Reset-May...

Please provide more details:

Maya Version?

Arnold Version?

Does it happen every time or only with a special scene?

Screenshot?

Hardware Specs

...

[Stephen.Blair]

Most likely those libpng warnings are for some png textures you're using. See https://wiki.archlinux.org/index.php/Libpng_errors

But since the render will be using tx files (unless you disabled the auto tx conversion), those warnings are probably coming from the maketx stage, which is pre-render. So probably safe to ignore the warnings.

For the slow render, let's see an Arnold log (verbosity level Warnings + Info). For one thing, the log header will have your system info, like this:

00:00:00  1496MB         | log started Thu May 18 16:52:41 2017
00:00:00  1496MB         | Arnold 5.0.0.2 [f2591180] windows icc-17.0.2 oiio-1.7.12 osl-1.8.2 vdb-4.0.0 rlm-12.2.2 2017/05/08 11:52:26
00:00:00  1496MB         | host application: MtoA 2.0.0.1 7493eb5a (master) Maya 2017
00:00:00  1496MB         | running on REMFDXQFB2, pid=10100
00:00:00  1496MB         |  2 x Intel(R) Xeon(R) CPU E5-2650 v3 @ 2.30GHz (20 cores, 40 logical) with 32690MB
00:00:00  1496MB         |  Windows 7 Enterprise Edition Service Pack 1 (version 6.1, build 7601)
00:00:00  1496MB         |  soft limit for open files raised from 2048 to 2048