In the past I have provide you with resource lists of iOS and Android applications for the cinematographer, some still are free offering basic software and others are paid, offering more professional software like the Depth of Field (DOF) Calculator that can help you get a job done a little better or a little faster than before.
The false-color picture lets you define allowable contrast ranges, and see instantly which shadows are underexposed and what highlights risk clipping:
Check exposure: aim the camera at the scene, and read off the exposure (use the spot meter if necessary to narrow down the area of interest). You can tap EXP to freeze the reading, and then vary ISO and shutter to see how aperture changes even if you are no longer pointing the camera at the scene.
Compare exposures: aim the camera at a gray card or other reference target, and tap EXP. Cine Meter will hold that exposure, letting you walk around the set and look at the waveform monitor and false-color displays to compare light levels to your reference.
Compare white balances: aim the camera at a white or gray card under your reference lighting, and tap EXP to lock the white balance. Cine Meter will hold that white balance, and you can use the RGB mode of the waveform monitor to examine the color balance as you walk around the set. (The range of color temperatures and lighting spectra that Cine Meter will properly white balance to is entirely dependent on the camera in your iDevice: some accommodate a wider range of white points than others do.)
Check lighting evenness: when you need flat, even lighting (on a greenscreen, white cove, test charts, or flat art), Cine Meter’s waveform monitor shows you the relative light levels across the camera’s field of view in a single glance. It’s a lot quicker to use the waveform monitor than to spot-meter several points across the field of view, or to take multiple incident readings to get the same information.
Match color temperatures: using WB and the RGB waveform monitor makes it very simple to compare LCD displays, different LED lights, or any other combinations of radiant or reflected lights. If you use WB on a known-good source (or a white card illuminated by it), the differing RGB levels when looking at another source will indicate how you have to color-correct it to make it match, without the subjectivity of the human eye.
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