# black box rendering error in batch mode

**URL:** https://discourse.paraview.org/t/black-box-rendering-error-in-batch-mode/1670
**Category:** ParaView Support
**Created:** [April 16, 2019, 1:25am UTC](https://discourse.paraview.org/t/black-box-rendering-error-in-batch-mode/1670 "2019-04-16T01:25:29Z")
**Posts on this page:** 3
**Page:** 1

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### Author: ![Mark\_Lohry](https://discourse.paraview.org/user_avatar/discourse.paraview.org/mark_lohry/32/1356_2.png) [@Mark\_Lohry](https://discourse.paraview.org/u/Mark_Lohry)
#### Post date: [April 16, 2019, 1:25am UTC](https://discourse.paraview.org/t/black-box-rendering-error-in-batch-mode/1670/1 "2019-04-16T01:25:29Z")

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When running in batch mode with pvpython outputting images, I find that maybe 1 in 4 images has a black box overlay on it in some random location. Anyone come across this?

 ![rayleigh_benard_ra1e9_32N2_T_001870](https://discourse.paraview.org/uploads/default/original/2X/f/f04b32500a7abb2b0378d680c90adc8677d72ff8.jpeg)

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### Author: ![wascott](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/w/8e8cbc/32.png) [@wascott](https://discourse.paraview.org/u/wascott)
#### Post date: [April 16, 2019, 1:41am UTC](https://discourse.paraview.org/t/black-box-rendering-error-in-batch-mode/1670/2 "2019-04-16T01:41:57Z")

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Try using pvbatch in batch mode? Pvpython is generally used interactively. Also, be sure to read the header from your trace. It tells you how to edit the trace for pvbatch.

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<div class="post-metadata">

### Author: ![wascott](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/w/8e8cbc/32.png) [@wascott](https://discourse.paraview.org/u/wascott)
#### Post date: [April 16, 2019, 1:54am UTC](https://discourse.paraview.org/t/black-box-rendering-error-in-batch-mode/1670/4 "2019-04-16T01:54:49Z")

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Pvbatch, and pvpython are described in the ParaView Guide. You can find this through the Help menu. See chapter 1.3 and 1.5, and especially all of chapter 14.9 (for pvbatch).

Alan