How should this guide be used in engineering workflows?

Use it as an implementation checklist, then convert key controls into automated tests and runbooks.

What is the expected outcome after applying this guide?

Lower validation defects, clearer failure diagnostics, and more predictable file-processing behavior.

Image Optimization Test Plan

Validate image conversion pipelines for quality, compatibility, and performance.

image performance

Balance Quality and Performance

Optimization policy should define acceptable quality floors by use case: thumbnails, product images, editorial photos, and hero backgrounds. Use objective thresholds and visual spot checks for each class.

Coverage Checklist

Transparency behavior across PNG/WebP/AVIF variants.
Color profile preservation and conversion correctness.
Responsive breakpoints and srcset generation.
Metadata retention/stripping policy verification.

Operational Metrics

Track byte savings, transformation latency, cache hit rates, and decode time in target browsers. Optimization policy should be revisited when device mix or design requirements shift.

Recommended Tools

Upload Test Matrix Builder

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Manifest Diff

Diff two manifests to detect added, removed, or changed files.

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