Separate verified file savings from subjective visual quality
The practical problem
An image optimizer can accurately measure bytes without knowing whether hair, line art or tiny labels became unreadable after encoding.
Implementation protocol
Use objective format and size checks, then run human visual assessment on crops representing text, transparency and gradients. Keep those outcomes as separate claims.
Worked scenario
If a cover shrinks from 120 KB to 62 KB, report a measured byte reduction; do not automatically call it 'better image quality'.
What could go wrong
Encoder settings are not portable quality scores across different source art.
Acceptance criteria
Retain approval screenshots and review at native size before promoting a preset.
Source material and evidence boundaries
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