First Things First:
Running iOS 9? Update to iOS 9.2 or higher! iOS versions 9.0 and 9.1 break the brightness metadata reported by some iDevice cameras, resulting in incorrect and inconsistent exposures. Cine Meter version 1.6 has a workaround (“Use Computed Brightness”) which you should turn off after updating either iOS or Cine Meter. More details here.
Can’t find Cine Meter on the App Store? If you’re on an iPad running iOS 6 or later, the App Store app defaults to showing only iPad apps. Select “iPhone Apps” at the top of the screen, and Cine Meter should appear.
Is Cine Meter not installing / not starting / crashing on your iDevice? Try a reset: hold down the power and home buttons until the screen goes dark, and keep holding them down until the Apple logo appears (about 10 seconds overall). After your iDevice comes back up, try Cine Meter again.
No picture? No waveform? Readings don't change? Starting with iOS 8, apps need permission to use the cameras, and sometimes iOS doesn't ask you. Exit Cine Meter and open the Settings app. Navigate to Privacy > Camera, and make sure Cine Meter is given permission.
Running iOS 8, and exposure readout is stuck at f/64+ or f/inf? Update Cine Meter to the current version. When the camera metadata reports "infinite" brightness, as some iDevices on iOS 8 do, versions 1.1 and later compute the scene brightness from the camera's exposure settings combined with the resulting picture levels. (When doing so, "computed brightness" appears in the third readout box above the toolbar.)
Exposure readings are wrong or inconsistent? Update both Cine Meter and iOS to the current versions for best results. More details here. Also, make sure you calibrate Cine Meter!
EXP Lock and WB Lock buttons don't work? These buttons broke in version 1.1 on some iDevices running iOS 8. Version 1.2 fixed them on 32-bit iDevices; version 1.4 fixed them on 64-bit iDevices. Please update to the current version.
Cine Meter gives you absolute light meter readings, but only relative picture and waveform monitor levels:
Cine Meter’s picture and waveform meter don't use the exact exposure shown by the light meter: they will usually be within a stop of the light meter's exposure, but there is no direct comparison between the two, for reasons described here. You can use the light meter to get an absolute exposure reading, but the picture and waveform monitor only show you relative levels within a scene, not absolute levels based on the meter reading.
You can't preset an exposure or a white balance in Cine Meter. To compare exposure levels or white balances, you need to lock Cine Meter’s auto-exposure and auto-white-balance settings while looking at a reference such as a gray card. The picture and waveform monitor only show you levels and colors relative to those locked settings, not to any pre-determined value.
Need more help?
- Controls shows you Cine Meter's buttons, gestures, and settings, and explains how they work.
- How To... describes how to use Cine Meter and shows some examples.
- FAQ lists some frequently asked questions and their answers.
- Details & Info talks about how Cine Meter works and what its limitations are, gives tips and tricks for using it, and has some observations about iDevice cameras and how they make their pictures.
If none of these solve your problem, please contact me!
© 2014–2016 Adam J. Wilt. Last updated 2016.03.01