How to use

In this section: Written instructions for iOS and Android; video instructions; general tips on angles to take photos of different building features.

iOS – Get Luminance instructions

• Open Get Luminance
  • Touch ‘Gallery’
  • Select photo
• Select and Measure LRV area 1
  • Touch photo to get ‘selector box’
  • Selector box can be moved around
  • Adjust photo size if needed: 2-finger pinch or 2-finger spread to reduce or enlarge selected area of photo and 1-finger to move image (note selector box disappears)
  • Touch resized photo to get selector box back
  • Touch ‘crop’ symbol next to ‘Get LRV 1’
  • Touch ‘Get LRV 1’           (LRV for area 1 appears in right hand box)
• Select and Measure LRV area 2
  • As area 1 except ‘Get LRV 2’
  • Touch ‘Get LRV 2’
• Calculation of visual contrast (luminance contrast)
  • Select ‘Calculation method’ from menu
  • Touch ‘Calculate’               Visual contrast of area 1 and 2 shown (this is a value of 0-100 and has no units)
• Touch ‘Clear’ to clear values (not photo)
• For measurements from a new photo, go to Gallery

Android – Get Luminance instructions

• Open Get Luminance
  • Touch ‘Start’
  • Touch ‘Gallery’
  • Select photo
• Select and Measure LRV area 1
  • Touch ‘crop’ symbol next to ‘Get LRV 1’   (opens screen 2)
  • Selector tool appears in centre
  • Move selector to area to be measured   (it will adjust photo)
  • Selector tool can be moved or resized
  • Touch ‘Crop’ (top right)
  • Selection appears in screen 1
  • Touch ‘Get LRV 1’          (LRV for area 1 appears in right hand box)
• Select and Measure LRV area 2
  • As area 1 except Touch ‘crop’ symbol next to ‘Get LRV 2’   (opens screen 2) and
  • Touch ‘Get LRV 2’       (LRV for area 2 appears in right hand box)
• Calculation of visual contrast (luminance contrast)
• Select ‘Calculation method’ from menu
• Touch ‘Calculate’       Visual contrast of area 1 and 2 shown (this is a value of 0-100 and has no units)
• Touch ‘Clear’ to clear values (not photo)
• For measurements from a new photo, go to Gallery.

iOS video instructions

Android video instructions

General use

For vertical building features:

Eg door and wall contrasts; glazing decals/manifestation;

• Hold camera at 90^o to the horizontal.
• Take photo.
• Assess visual contrast.

For glazing strips – take photo both inside and outside to assess safety and amenity of glazing strip.  There can be marked differences between inside and outside.

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For horizontal features:

Eg Floor and wall contrast; tactile surface indicators

• Hold phone within typical viewing angle 40^o-50^o. 
• Take photo.
• Assess visual contrast.

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For angled features:

Eg stair handrails, stair nosings, ramps

• Hold phone within typical viewing angle for use of stairs, (typically 30-50^o) or ramps (typically 0-30^o).
• Take photo.
• Assess visual contrast.

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