High-contrast black-and-white stock for optical effects — produces crisp, graphic silhouettes. Essential for title sequences and matte painting compositing.
Lith film was the workhorse of optical effects long before digital became standard. You needed it whenever you required crisp, graphic images without intermediate tones — pure black-and-white contrasts that could be cleanly composited. The material had extreme contrast characteristics: a very steep gradation curve, practically no grays. Either black or white, nothing in between. This sounds limiting, but it was exactly what optical printers needed.
In practice, Lith film was mainly used for two applications. First: title sequences — you filmed your graphic, your lettering, or your logo, made a high-contrast dupe of it, and immediately had a purely binary image for clean matting and compositing operations. Second: matte work. If you needed a silhouette of a model, a miniature, or a hand-animated element as a matte, Lith film got you there faster than elaborate rotoscope sessions. You filmed the element against white, made a contact print on Lith, and the silhouette was perfectly black, the background white — no complex post-processing needed.
The technical peculiarity: Lith film reacted extremely sensitively to exposure. Minimal underexposure — everything black. Minimal overexposure — everything white. This required precise exposure control when photographing the artwork or during optical printing. Many DoPs and optical technicians developed a very fine sense for this sweet spot. You often needed several attempts until the density was right. But once you had it, you could reproducibly pull further generations — ideal for multiple compositing.
With digitalization, Lith film disappeared from studios. Today, you create these binary mattes on the computer — threshold filters, boolean operations, keying. This is more flexible and faster. But Lith film remains present in film history: many iconic title sequences from the 60s and 70s owe their look to this material — this characteristic sharpness, this absolute graphic clarity without anti-aliasing softness. It was an analog process tool that set limits through its nature — and precisely because of that, it forced clear visual thinking.