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

Video for iOS

Android video instructions

Video for Android

General use

For vertical building features:

Eg door and wall contrasts; glazing decals/manifestation;

  • Hold camera at 90o 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.

For horizontal features:

Eg Floor and wall contrast; tactile surface indicators

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

For angled features:

Eg stair handrails, stair nosings, ramps

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