Color Rendering Index

What this is about

CRI became a buying criterion when LED fixtures arrived, because a discharge or diode source can look white while missing whole parts of the spectrum. A lamp with gaps renders a red costume muddy and skin slightly wrong, and no grade separates that from the rest of the picture afterwards. The number is a rough guide rather than a verdict: the standard average hides weak red rendering, which is exactly where faces and blood and fabric live. Serious departments therefore shoot a test with the actual fixtures, a colour chart and the real costume before a package is booked for a shoot.

A term only helps when everyone on set means the same thing by it — so what follows is how it is used, not a dictionary definition.

What runs differently here

In planning terms, that means:

• The common score is an average over test colors, so a good number can still hide one badly rendered hue.
• Red rendering is reported separately as R9 and matters most for skin, blood and warm costume fabrics.
• Film-specific measures such as TLCI and SSI judge a source against a camera rather than against the human eye.

With TillyGen

TillyGen's equipment list names fixtures by model rather than by category, so a cheap LED cannot slip into a package that needs matched color.

Change one constraint and the consequences travel through the whole plan: affected shots are flagged, the call sheet is regenerated, and nobody keeps working from yesterday's version.