37 lines
1.7 KiB
Markdown
37 lines
1.7 KiB
Markdown
# Multiple Profiles
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Extract and compare line profiles from two fields along a chosen row or column. Supports overlay, mean, and difference modes.
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## Inputs
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| Name | Type | Required | Description |
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|------|------|----------|-------------|
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| field_a | DATA_FIELD | Yes | First input field |
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| field_b | DATA_FIELD | Yes | Second input field |
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## Outputs
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| Name | Type | Description |
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|------|------|-------------|
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| profile | LINE | Resulting line profile |
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## Controls
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| Name | Type | Default | Description |
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|------|------|---------|-------------|
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| row | INT | -1 | Row (horizontal) or column (vertical) index to extract; -1 uses the centre row/column (-1-10000) |
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| direction | dropdown | horizontal | Profile direction: horizontal (extract a row) or vertical (extract a column) |
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| mode | dropdown | overlay | Combination mode: overlay (field_a profile only), mean (average of both), or difference (field_a minus field_b) |
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| blend | FLOAT | 0.5 | Opacity of field B in the preview (0 = only A, 1 = only B). Affects the preview image only, not the extracted profile. |
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## Interactive preview
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The preview shows field A blended with field B and highlights the row or column being sampled. Click or drag on the image to move the line; switch between row and column extraction with the `direction` control.
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## Notes
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- When the two fields have different sizes, profiles are truncated to the shorter length so they can be compared element-wise.
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- The x-axis of the output profile uses physical spacing (dx for horizontal, dy for vertical) from field_a.
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- The output y-unit inherits field_a's z-unit.
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- Difference mode is useful for visualising drift, processing artefacts, or changes between sequential scans.
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