Rhopoint Instruments Manual
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Polishing Quality Parameters

Index Name / Title Unit Description
60° 60° Gloss GU Conventional 60° gloss value indicating overall specular reflectance of the polished area.
S Sharpness % Measures image sharpness/clarity in the reflected image, related to DOI; higher values mean crisper reflections.
MC Haze Michelson Haze HU Quantifies haze as low-contrast veiling around reflections that reduces clarity on polished surfaces.
LogH C LogHaze Compensated logHU Compensated LogH value that corrects for gloss level, aligning more closely with visual perception of haze.
VisH-Out Visual Haze Outdoors VHU Perception-based haze index modelling how haze appears under outdoor/daylight conditions.
VisH-In Visual Haze Indoors VHU Perception-based haze index modelling how haze appears under indoor/controlled lighting.
DOI Distinctness of Image % Describes how clearly objects are reflected in the surface; low DOI indicates milky or blurred reflections.
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.