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Add example: pixel grid overlay on image #30457

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Add example: pixel grid overlay on image #30457

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Faazc
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@Faazc Faazc commented Aug 23, 2025

PR summary

This PR adds a new example script (pixel_grid.py) to demonstrate how to overlay a pixel-aligned grid on top of an image using Matplotlib.

-The example demonstrates how to overlay a pixel-aligned grid on an image, which is particularly helpful for visual localization in image analysis.

  • This is useful for educational purposes, visual inspection, or image analysis.
  • The script shows how to load an image (or synthetic data), display it, and add vertical/horizontal grid lines spaced at fixed intervals.
  • The example is simple, self-contained, and uses standard Matplotlib and NumPy functionality.

PR checklist

  • [N/A] "closes #0000" is in the body of the PR description to link the related issue
  • [N/A] new and changed code is tested
  • Plotting related features are demonstrated in an example
  • [N/A] New Features and API Changes are noted with a directive and release note
  • Documentation complies with general and docstring guidelines

@github-actions github-actions bot added the Documentation: examples files in galleries/examples label Aug 23, 2025
@timhoffm
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Thanks for the PR. I believe looping over axvline/axhline is typically not the right apporach. If it is ok to limit the grid to the image area, using hlines()/vlines() is simpler. If you want a grid that spans the Axes, using grid() and appropriate ticks is simpler.

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