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

[Patrick Brockmann <patrick.brockmann@xxxxxxxxxxxx>]

Re,

In fact there is a pngonlyoption that exists and should be noticed in the documentation.

From pyferret code (pyferret/__init__.py)

pngonly: (boolean)    if True, do not display to the console and only raster (PNG)  
                             images can be saved; plots will be generated faster but  
                             removes support for deletion of parts (segments) of a plot.

Regards

Patrick

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De: "Patrick Brockmann" <patrick.brockmann@xxxxxxxxxxxx>
À: "ferret users" <ferret_users@xxxxxxxx>
Envoyé: Jeudi 21 Janvier 2021 21:05:39
Objet: [ferret_users] pyferret frame images with nodisplay have small white lines

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')
pyferret.run('shade/lev=20v temp[k=1]')
pyferret.run('frame/file=tyty.png')

$python tyty.py

Tested with last 7.63 release

Regards

Patrick

--
Data Analytics and Visualization Engineer / Project Manager
LSCE/IPSL, CEA-CNRS-UVSQ laboratory
LSCE - Climate and Environment Sciences Laboratory
IPSL - Institut Pierre Simon Laplace
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