Display method of film on theater screen — digital DCP or 35mm via projectors with defined color space and brightness specs. DOP calibrates grading to this medium.
Once you've delivered the edit, your footage will be projected onto a screen — and that's precisely when it becomes clear whether your grading decisions hold up on the monitor or if all your work looks different in the darkness of the cinema. Cinema projection isn't just a technical process; it's the moment your image becomes the viewer's reality. That's why every DoP must understand how projectors work and what standards they dictate.
The standard workflow today: DCP (Digital Cinema Package) — an encrypted data container calculated backward from the screen. The projector reads it and casts light through a color grid or a three-chip system onto the screen. The brightness is typically 14 Foot Lamberts (approx. 48 Candela/m²) at the white point — that's your reference value. Important: This is not your monitor. Your grading monitor shows you around 100 nits. The cinema projector emits four to five times that amount. This means: if you grade too bright, the film will blow out in the cinema. If you grade too dark, you'll lose shadow detail.
The color space in cinemas is based on the DCI-P3 standard — a wider color gamut than Rec.709 (broadcast). Greens and reds can be more intense, and blues behave differently than on a TV monitor. Some DoPs make the mistake of building their LUTs solely according to the home cinema standard — then the film appears either oversaturated or color-shifted in the cinema. You need a DCP master LUT that is specifically calibrated for this color space.
Practically on set: If you want to know how your material will look later, you need a calibrated projector or at least a monitor that can display DCI-P3. Many productions in Germany don't have access to a real cinema projector during post-production — in that case, the grading room itself must become the reference standard. This means: white point at 6500K, adjust luminance to the DCP specification, and keep ambient light absolutely dark.
One last point: Not all cinemas project equally. Some work with older 2K projectors, others with 4K DCI. Some have screen gain issues or are simply poorly calibrated. This is beyond your control — but your DCP must be robust enough to still look good in a mediocre cinema. That's craftsmanship.