Chroma Key vs Technicolor
クロマキー / テクニカラー
Both sit in Film Technology, so the question is not what they belong to but how they behave. Both are read here as technique. They are reached for with some of the same intent, which is where they get confused.
Chroma Key
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Compositing that renders one color transparent so the image can be laid over another. From optical blue-screen work through the BBC's CSO to today's green screens and virtual studios, it has remained the foundation of the craft.
Technicolor
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Brought saturated color to cinema by separation negatives and dye transfer, fixing 'color more vivid than reality' in film memory.
| Chroma Key | Technicolor | |
|---|---|---|
| Era | 1930s– | 1922–1950s |
| Family | Film Technology | Film Technology |
| Kind | Technique | Technique |
| Cues | A single-color backdrop / Keyed edges / A separated foreground / Lighting designed for the composite | Saturated primaries / Dye-transfer depth / Color supervision / Color-coding dream and reality |
| Best used for | Weather and news, putting a presenter and graphics into one frame · Adding places or scale after the shoot when the real thing is impossible | Separating dream or spectacle from the ordinary by color alone · Musical and festival footage that needs the lift of saturated primaries |
| Type | Choose lettering colors far from the key color and from the plate | Set titles on flat color, separate planes by density not face |
| Composition | Fix eyeline and horizon height for both plates before shooting | Distribute color through costume and set, fix the area ratio first |
| Material | Light the backdrop evenly and pull the subject away to stop spill | Keep reds and cyans deep, pull saturation only out of skin |
| Caution | Compositing without matching the light, leaving green on the edges while shadows fall in a direction the background never had. | Raising saturation across the board is not Technicolor, skin goes muddy, and every part of the frame ends up loud in the same way. |