topic Why does exportToPDF cause "libpng error: Not a PNG file"? in ArcGIS API for Python Questions

Why does exportToPDF cause "libpng error: Not a PNG file"?

ArwenVaughan1 — Fri, 18 Dec 2020 18:24:04 GMT

I am using the exportToPDF function to export a layout to PDF and after each successful export the lines below are written to standard output. As far as I know there is no actual error or problem. Does anyone know how to avoid getting this output, which fills up your Std Out and/or log files?

"libpng error: Not a PNG file"

Re: Why does exportToPDF cause "libpng error: Not a PNG file"?

DanPatterson — Fri, 18 Dec 2020 20:14:02 GMT

What version of arcgis pro or arcmap are you using? (it determines the version of arcpy)

Re: Why does exportToPDF cause "libpng error: Not a PNG file"?

ArwenVaughan1 — Fri, 18 Dec 2020 20:18:59 GMT

Hi Dan. I am using 2.6.2 currently. Any thoughts? I may try upgrading to 2.7 and see what happens.

Re: Why does exportToPDF cause "libpng error: Not a PNG file"?

DanPatterson — Fri, 18 Dec 2020 20:25:19 GMT

Before you leap! Compare libpng versions using conda or your python list in the Project backstage.

(arcgispro-py3) C:\arc_pro\bin\Python\envs\arcgispro-py3>conda list libpng
# packages in environment at C:\arc_pro\bin\Python\envs\arcgispro-py3:
#
libpng 1.6.37 h2a8f88b_0

Re: Why does exportToPDF cause "libpng error: Not a PNG file"?

ArwenVaughan1 — Fri, 18 Dec 2020 20:54:20 GMT

OK, here are my results...same...it looks like

# packages in environment at C:\Program Files\ArcGIS\Pro\bin\Python\envs\arcgispro-py3:
#
libpng 1.6.37 h2a8f88b_0

Re: Why does exportToPDF cause "libpng error: Not a PNG file"?

DanPatterson — Fri, 18 Dec 2020 21:16:14 GMT

Then don't go upgrading on a Friday... see if there was a bug in the first place and if so, see if it has been fixed

Release notes for ArcGIS Pro 2.7—ArcGIS Pro | Documentation

Then prepare for an upgrade on monday (there are a few "experiences" on upgrading to 2.7 you might want to look for over the weekend)