# Linear Scratch Parameters

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|Index|Name / Title|Unit|Description|
|---|---|---|---|
|60°|60° Gloss|GU|Conventional 60° gloss value indicating overall specular reflectance of the polished area.|
|Min Length|Minimum Detection Length|µm|Parameter which determines the minimum length of detected scratches.|
|Sensitivity|Sensitivity of Detection|–|Parameter which controls the sesnistivity of the scratch detection algorithm.|
|Mask Radius|10° Spot Covering Mask Area|Pixel|Parameter which sets the radius of the analysis mask used around the 10° spot when detecting scratches.|
|Length|Average Scratch Length|µm|Average length of all detected scratches in the measurement area.|
|Length V|Average Scratch Lengh Vertical|µm|Average length of scratches predominantly oriented in the vertical direction.|
|Length H|Average Scratch Lengh Horizontal|µm|Average total length of scratches predominantly oriented in the horizontal direction.|
|Area|Total Scratched Area|µm²|Combined area covered by all detected scratches.|
|Area V|Scratched Area Vertical|µm²|Total area of vertically oriented scratches.|
|Area H|Scratched Area Horizontal|µm²|Total area of horizontally oriented scratches.|
|Count|Total Scratches|–|Total number of scratches detected in the analysed area.|
|Count V|Scratches Vertical|–|Number of vertically oriented scratches.|
|Count H|Scratches Horizontal|–|Number of horizontally oriented scratches.|
|Visibility|Scratch Visibility Average|AU*|Average perceived visibility of all detected scratches.|
|Visibility V|Scratch Visibility Vertical|AU*|Perceived visibility of vertically oriented scratches.|
|Visibility H|Scratch Visibility Horizontal|AU*|Perceived visibility of horizontally oriented scratches.|
|R (RGB)|Red Channel Colour|Intensity (0–255)|Average red-channel surface colour in the analysed area.|
|G (RGB)|Green Channel Colour|Intensity (0–255)|Average green-channel surface colour in the analysed area.|
|B (RGB)|Blue Channel Colour|Intensity (0–255)|Average blue-channel surface colour in the analysed area.|

*AU = arbitrary (instrument) units.