Compare images

VisionConfigured target requiredvision.compare-images

Measure visual difference between two explicit images on the same logical region.

Example use

Compare the same region before and after an action to measure visual change.

Node preview

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Data inputs 5

Before imagebeforeImage: Baseline image.
RequiredDefault: None
After imageafterImage: Image compared with the baseline.
RequiredDefault: None
Comparison regionregionRegion: Same ratio or pixel region resolved independently in both images.
Default availableDefault: {"height":1,"unit":"ratio","width":1,"x":0,"y":0}
Value format examples
{"height":0.5,"unit":"ratio","width":0.5,"x":0.25,"y":0.25}
Grid sizegrid-sizeInteger: Box-average grid width and height, from 1 to 256.
Default availableDefault: 32
Minimum: -9007199254740991
Maximum: 9007199254740991
Value format examples
0
42
Cell deltacell-deltaInteger: Per-channel 8-bit difference required to count a grid cell as changed.
Default availableDefault: 12
Minimum: -9007199254740991
Maximum: 9007199254740991
Value format examples
0
42

Data outputs 2

Changed ratiochanged-ratioNumber: Fraction of grid cells whose maximum channel delta exceeds the threshold.
Mean differencemean-differenceNumber: Mean absolute channel difference normalized to 0–1.

Version and node identity

Version 1.0.0

sha256:0b0e2ff3a6b7378941ee7846bb9486e7c9a93b1e02896eb055d0d1f45c023276