[ferret_users] pyferret frame images with nodisplay have small white lines

[Patrick Brockmann <patrick.brockmann@xxxxxxxxxxxx>]

Hi all,

With pyferret and the -nodisplay option I get some white horizontal lines 

that makes the image captured by the frame command not very nice (at least strange).

Is there a workaround ? 

Initially (re)discovered from a python notebook (with ferretmagic https://github.com/PBrockmann/ipython_ferretmagic)

$ cat tyty.jnl

use levitus_climatology
shade/lev=20v temp[k=1]
frame/file=tyty.png

$ pyferret -nodisplay -script tyty.jnl

I have tested the pyferret -png option.

It produces an image without lines. That would be perfect but how to retrieve this mode

from a pyferret.start function (the way ferretmagic produces images).

Please test:

$cat tyty.py

import pyferret
pyferret.start(verify=False, journal=False, unmapped=True, quiet=True)
pyferret.run('use levitus_climatology')
pyferr tyty.png
Description: PNG image