Color in Film and Video

Open raw cinema footage and it looks wrong: washed-out, low-contrast, desaturated. That is log encoding, and it is intentional. A camera sensor captures far more dynamic range than a display can show, and log curves (S-Log, Log-C, V-Log, and others) pack that wide range into the recorded signal by compressing the highlights and lifting the shadows. The flat image is not the final picture - it is a negative, holding the maximum tonal information so the colorist has room to work without clipping highlights or crushing blacks.

A LUT (look-up table) is a precomputed mapping from input colors to output colors - a baked recipe applied at speed. There are two jobs they do, and confusing them causes most LUT mistakes. A technical (transform) LUT converts color from one space to another - log to Rec.709, or one camera's color science to a common space. A creative (look) LUT applies a style on top of an already-display-ready image. Apply a look LUT directly to raw log and it will look wrong, because the look assumed normalized input.

The heart of grading is three controls that target three tonal regions largely independently. Lift moves the shadows, gain moves the highlights, and gamma bends the midtones between them. Each can be applied to overall brightness or per color channel to add a tint to shadows, mids, or highlights. Formalized as the ASC CDL's offset, slope, and power, this three-way model is the colorist's primary tool.

Grading happens in two passes. Primary grading affects the whole frame: exposure, white balance, contrast, and overall color - the lift/gamma/gain work above, getting every shot balanced and consistent. Secondary grading is local: isolating a region by a color key (skin tones, the sky), a shape (a power window), or tracking, and adjusting only that - warming a face, deepening a sky, drawing the eye. Primary makes it correct; secondary makes it intentional.

A look is the signature color identity of a film - and most are built from a few repeatable moves: split-toning shadows and highlights toward complementary hues, shaping contrast, and controlling saturation. The famous teal-and-orange grade pushes shadows cyan-teal and skin/highlights orange, exploiting complementary contrast to make people pop off the background. Try a few on the same frame.

Where the graded image is going decides its color space. Rec.709 is the long-standing HD/SDR broadcast and web standard - the same primaries as sRGB. DCI-P3 is the digital-cinema and modern-display gamut, noticeably wider in reds and greens. Rec.2020 is the very wide UHD/HDR container, larger than most displays can yet fully show. A delivery is mastered for a specific target, and going to a smaller one requires the gamut mapping from the previous article.

A production's color flows through a fixed chain, and keeping it managed end to end is what makes shots from different cameras match and the final master predictable.

ACES (the Academy Color Encoding System) standardizes this: input transforms (IDTs) bring any camera into a huge common space, you grade there, and output transforms (ODTs) render to each delivery. It is the modern answer to "how do we keep color consistent across cameras, vendors, and formats" - the moving-image cousin of ICC color management.

Six questions on log, LUTs, grading, and gamuts. Instant feedback, no scores recorded - a wrong answer comes with a short explanation.

Moving-image color builds on transfer functions, gamuts, HDR, and mapping. The numbers reflect each article's position in the editorial roadmap.