python runtime_error ai_generated true

ValueError: dpi must be a positive number, got -100

ID: python/matplotlib-savefig-dpi-error

Also available as: JSON · Markdown · 中文
80%Fix Rate
86%Confidence
0Evidence
2024-03-05First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
3.7 active — — —
3.8 active — — —

Root Cause

Passing a negative or zero value for the dpi parameter in savefig() or figure creation.

generic

中文

在savefig()或创建图形时，为dpi参数传递了负数或零值。

Workarounds

  1. 95% success Use a positive integer for dpi 
    plt.savefig('plot.png', dpi=300)
  2. 90% success Check the variable value before passing 
    dpi_value = 300; if dpi_value > 0: plt.savefig('plot.png', dpi=dpi_value)

Dead Ends

Common approaches that don't work:

  1. Using a very large positive DPI like 10000 50% fail

    While it doesn't raise an error, it may cause memory issues or produce excessively large files.

  2. Passing dpi as a string like '300' 90% fail

    dpi must be a number, not a string; this raises a different TypeError.