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KNISCO INCLUSIVE ACCESS

luminance contrast calculator

What is Luminance Contrast?

  Luminance contrast is the difference in the amount of light reflected from one surface compared to the amount of light reflected from another surface. 


Luminance contrast is calculated with Bowman-Sapolinski equation:

C = 125 (Y2 − Y1)/(Y1 + Y2 + 25) 

where Y1 and Y2 are the luminous reflectance values (LRV) of the two surfaces.

 



Definitions: 


Tactile ground surface indicator (TGSI)

  Truncated cones and/or bars installed on the ground or floor surface designed to provide pedestrians who are blind or vision-impaired with warning or directional orientation information.


Integrated tactile ground surface indicators (Integrated TGSIs)  

TGSIs that are in a defined pattern and which are of the same luminance and material as the base surface.


Discrete Tactile Ground Surface Indicators (Discrete TGSIs)

TGSIs that are individually installed, which provide the same luminance for the sloping sides and upper surface of the truncated cone.


Composite discrete tactile ground surface indicators (Composite

Discrete TGSIs)

  TGSIs that are individually installed and which provide a differing luminance for the sloping sides and upper surface of the truncated cone.

 Acronyms:

LRV: Luminous Reflectance Value
TGSIs: Tactile Ground Surface Indicators 


References: 

 AS/NZS 1428.4.1:2009 Admt 1 and 2  


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Knisco acknowledge the traditional custodians of country throughout Australia, specifically the Turrbal Tribe who were the original inhabitants of the land in which we live and work. We recognise their continuing connection to the land, sea and community, paying our respects to the elders past, present and extending that respect to all Aboriginal and Torres Strait Islander people today, tomorrow and always.


Knisco Development Solutions Pty Ltd 

Established July 2010


Knisco Inclusive Access Pty Ltd

 Established January 2018

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