Delta e image plot

[joshqsumner]

Describe your changes
Adds a function to make a barplot of delta E values to the qc module.

Type of update
This is a new feature

Associated issues
Part of #1910

Additional context
This builds off of PRs #1905, #1920, and #1779

For the reviewer
See this page for instructions on how to review the pull request.

• PR functionality reviewed in a Jupyter Notebook
• All tests pass
• Test coverage remains 100%
• Documentation tested
• New documentation pages added to plantcv/mkdocs.yml
• Changes to function input/output signatures added to updating.md
• Code reviewed
• PR approved

[deepsource-io]

DeepSource Code Review

We reviewed changes in 2308749...087be45 on this pull request. Below is the summary for the review, and you can see the individual issues we found as inline review comments.

See full review on DeepSource ↗

PR Report Card

Overall Grade

Security   Reliability   Complexity   Hygiene   Coverage

Code Review Summary

Analyzer	Status	Updated (UTC)	Details
Python		Jun 17, 2026 6:18p.m.	Review ↗
Code coverage		Jun 17, 2026 6:18p.m.	Review ↗

Code Coverage Summary

Language	Line Coverage (New Code)	Line Coverage (Overall)
Aggregate	100% [✓ above threshold]	100%
Python	100% [✓ above threshold]	100%

➟ Additional coverage metrics may have been reported. See full coverage report ↗

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[Copilot]

Pull request overview

Adds new QC visualizations to support the emerging color quality tooling in pcv.qc, including a Delta E per-image bar plot, and updates tests + documentation/navigation to reflect the move of color QC plots into the QC module.

Changes:

• Add pcv.qc.plot_deltaE() (Altair) for per-chip Delta E bar plots (Macbeth + AstroBotany).
• Add pcv.qc.color_chip_comparison() (Altair) and pcv.qc.color_correction_plot() (matplotlib) and expose them via plantcv.plantcv.qc.
• Update tests and MkDocs navigation for QC plot pages; remove color_correction_plot export from plantcv.visualize.

Reviewed changes

Copilot reviewed 12 out of 18 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
tests/plantcv/qc/test_plot_deltaE.py	Adds tests asserting plot_deltaE returns an Altair layered chart.
tests/plantcv/qc/test_color_correction_scatter.py	Updates import to pull color_correction_plot from plantcv.plantcv.qc.
tests/plantcv/qc/test_color_chip_comparison.py	Adds a test asserting color_chip_comparison returns an Altair vconcat chart.
plantcv/plantcv/visualize/init.py	Stops exporting color_correction_plot from plantcv.visualize.
plantcv/plantcv/qc/plot_delta_e.py	Implements Delta E bar plot with category coloring + reference lines + chip swatches.
plantcv/plantcv/qc/color_correction_scatter.py	Adds QC scatter plot implementation (matplotlib).
plantcv/plantcv/qc/color_chip_comparison.py	Adds greenness-rank comparison visualization (Altair).
plantcv/plantcv/qc/init.py	Exports new QC plotting functions from the module.
mkdocs.yml	Adds QC docs pages to nav; removes visualize scatter page from nav.
docs/updating.md	Adds an updating entry for the color chip comparison plot (needs correction to qc).
docs/qc_plot_delta_e.md	Adds documentation page for the new Delta E plot (contains a truncated comment).
docs/qc_color_correction_scatter.md	Updates docs page to reflect the QC module path and images.
docs/qc_color_chip_comparison.md	Adds documentation page for the new chip comparison plot.

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