feat: add configurable shift parameter for Z-Image#9004
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Pfannkuchensack wants to merge 6 commits intoinvoke-ai:mainfrom
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feat: add configurable shift parameter for Z-Image#9004Pfannkuchensack wants to merge 6 commits intoinvoke-ai:mainfrom
Pfannkuchensack wants to merge 6 commits intoinvoke-ai:mainfrom
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Add a shift (mu) override to the Z-Image denoise invocation and expose it in the UI. When left blank, shift is auto-calculated from image dimensions (existing behavior). Users can override to fine-tune the timestep schedule, with an inline X button to reset back to auto.
Pfannkuchensack
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JPPhoto,
blessedcoolant,
dunkeroni and
lstein
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python
…me shift Use shift directly as a linear multiplier instead of exp(mu), giving more predictable and uniform control over the timestep schedule. Auto-calculated values are converted via exp(mu) to preserve identical default behavior.
lstein
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Apr 7, 2026
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Everything seems to work as advertised. However, the shift isn't included in the recall parameters.
Write z_image_shift into graph metadata and add a ZImageShift recall handler so the shift override can be restored from previously generated images. Auto-mode (null) is omitted from metadata to avoid persisting a stale value.
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Summary
Add a configurable shift (mu) parameter for Z-Image models to override the automatic sigma schedule calculation.
Backend:
shiftfield toZImageDenoiseInvocation(default:None= auto-calculate from image dimensions)1.5.0Frontend:
ParamZImageShiftcomponent with slider (1–7) and number input (0–10)zImageShift) and graph builderQA Instructions
Checklist
What's Newcopy (if doing a release after this PR)