8000 inconsistent outputs for pdf and png using AnchoredText · Issue #19676 · matplotlib/matplotlib · GitHub
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jiadongdan opened this issue Mar 10, 2021 · 4 comments
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inconsistent outputs for pdf and png using AnchoredText #19676

jiadongdan opened this issue Mar 10, 2021 · 4 comments
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status: duplicate

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@jiadongdan
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Bug report

Bug summary

Using savefig to pdf and png, outputs are different.

Code for reproduction

import numpy as np
import matplotlib.pyplot as plt
from matplotlib.offsetbox import AnchoredText

fig, ax = plt.subplots(1, 1, figsize=(3.2, 3.2))

ax.imshow(np.random.rand(100 ,100), cmap='Blues', vmin=-0.1, vmax=0.8)
at = AnchoredText("texts",
                  prop=dict(size=12), frameon=True,
                  loc='upper left',borderpad=0.05,
                  )
#at.patch.set_boxstyle("round, pad=0.,rounding_size=0.2")
at.patch.set_alpha(0.5)
at.patch.set_edgecolor([1, 1, 1, 0.5])
at.patch.set_linewidth(1)
ax.add_artist(at)

fig.savefig('test.pdf', dpi=300)
fig.savefig('test.png', dpi=300, transparent=False)

Actual outcome

pdf:

image

png:

image

PNG output has extra lines around the text, which is undesired.

Expected outcome

Matplotlib version

  • Operating system: Windows 10
  • Matplotlib version (import matplotlib; print(matplotlib.__version__)): 3.3.4
  • Matplotlib backend (print(matplotlib.get_backend())): Qt5Agg
  • Python version: 3.7
  • Jupyter version (if applicable):
  • Other libraries:
@timhoffm
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timhoffm commented Mar 10, 2021 •
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I cannot reproduce this. The line is present in both cases, as one would expect because you set at.patch.set_linewidth(1).

PDF / png
grafik

Is this maybe an issue with your PDF viewer? - I've tested with okular.

@timhoffm timhoffm added the status: needs clarification Issues that need more information to resolve. label Mar 10, 2021
@jklymak
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jklymak commented Mar 10, 2021

I get the layering of the frame in png, and PDF when viewed in Preview on a Mac.

Adobe Acrobat, however, does not composite the frame and its interior. This is easier to see if you use a wider frame and different color:

Adobe:

Adobe

Preview PDF:

Preview

PNG

PNG

I don't know that we can do anything here. Either argument can be claimed "correct" - we choose one thing in Agg, Preview and Okular the same thing, Adobe chooses something different.

@QuLogic
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QuLogic commented Mar 11, 2021

That is likely #10035.

@timhoffm
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I agree. I'm closing this as duplicate.

@timhoffm timhoffm added status: duplicate and removed status: needs clarification Issues that need more information to resolve. labels Mar 13, 2021
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@QuLogic @jklymak @timhoffm @jiadongdan
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