Use this cinematography or projection calculation to plan image geometry, exposure, timing, storage, film footage, or presentation from explicitly stated camera and display parameters.

Projector Lumens (lm)

Required number input.

Screen Gain

Required number input.

Screen Area Square Feet (ft²)

Required number input.

Approximate projected screen brightness in foot-lamberts from incident projector lumens, screen gain and screen area in square feet. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Brightness Foot Lamberts (fL)

The resulting brightness foot lamberts returned as a number.

• Contrast, dynamic range, luminance, screen gain, and foot-lambert calculations depend on measurement pattern, black level, ambient light, viewing angle, tone mapping, projector calibration, screen uniformity, and standard.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Confirm critical values with the actual camera, lens, codec, projector, and delivery specification, then run a camera or projection test under representative conditions.

• Projector Screen Width

  Projected image width from lens-to-screen throw distance divided by lens throw ratio.

• Projector Throw Ratio

  Projector throw ratio as lens-to-screen distance divided by projected image width in matching units.

• Film Frames Count

  Approximate exposed frame count from film footage times a specified gauge/perforation-dependent frames-per-foot value.