Tutorials Video

Leonard Troland: Technicolor's Research Director

By Infinite Creation · Profile

Historical photograph of Leonard Troland.

At a Glance

Leonard Thompson Troland (1889-1932) was Technicolor's research director and filed the core patents on the imbibition dye-transfer printing process that produced the company's characteristic look. He was also a significant vision scientist: the troland, a unit of retinal illuminance, is named for him. He died in 1932 at 43, in a fall.

Lived: 1889-1932, United States
Anchor year: 1928, the imbibition printing patents
Strand: overlooked, the technical half of Technicolor

Career

The problem as it stood

Technicolor's early two-colour process cemented two prints back to back, producing a thick film that cupped, scratched and went out of focus. Printing colour photographically was slow, expensive and unstable. A colour process for the industry had to yield ordinary-thickness prints in quantity.

What he actually did

Troland developed and patented imbibition printing for Technicolor: gelatin relief matrices, one per colour, that absorb dye and transfer it in register onto a single blank film: essentially a precision lithographic process using dye instead of ink.

How it worked

Each matrix carries a gelatin relief whose thickness varies with density. Soaked in cyan, magenta or yellow dye, it holds more dye where it is thicker, and pressed against the blank in register it transfers a dye image. Three passes give a full-colour print on normal stock, and because dye is cheap and the matrices are reusable, mass printing becomes affordable.

What it made possible

Technicolor as an industrial service. The saturated, stable dye-transfer look is why 1930s and 40s Technicolor films still project vividly while contemporaneous chromogenic prints have faded. Dye transfer survived into the 1970s and was briefly revived.

What happened to him

He fell to his death from a cliff at Mount Wilson Observatory in 1932, aged 43, before three-strip Technicolor reached the screen. His work in vision science was substantial enough that his name survives as a unit.

Where the credit landed

Technicolor is remembered through the Kalmus name, and the technical patents that made it printable are Troland's. He is a straightforward case of a research director absorbed into the company he worked for, compounded by dying young and before the process's greatest period. Note the corpus's own bias here: three of Technicolor's four profiled figures are engineers, and the one everybody argues about is the colour director.

Known For

Imbibition is dye transfer: closer to printing than to photography.
It is why Technicolor prints of the 1930s still look saturated and modern ones fade.
The troland, a unit of retinal illuminance, is named for him.

Knowledge Base

What You'll Learn

Technicolor is a printing process as much as a photographic one.

Why dye transfer outlasts chromogenic prints

Chromogenic prints form dyes chemically in the emulsion, and those dyes are chosen for processing convenience as much as stability. Many faded badly within decades. Imbibition transfers selected, stable dyes onto plain film. Archivists therefore treat surviving dye-transfer prints as among the most reliable colour records of the studio era, and the look people call "Technicolor" is as much this printing process as the camera.

Where This Fits

Troland's printing patents sit between Technicolor capture and projection, links followed in A History of Broadcast Technology.

FAQ

Q: What is imbibition printing?
A: A dye-transfer process in which gelatin relief matrices, one per primary, absorb dye and transfer it in register onto a blank film. Technicolor used it to print colour films in quantity on normal-thickness stock.

Q: Why do old Technicolor films still look so vivid?
A: Because dye-transfer prints use stable dyes applied to plain film, rather than dyes formed chemically in the emulsion. Many chromogenic prints from later decades have faded considerably more.

Sources

The patent was checked against the record. Checked 20 August 2026.

US Patent 1,707,695, Suction Apparatus for Imbibition Printing. Filed 27 May 1927 and granted 2 April 1929, assigned to the Technicolor Motion Picture Corporation, with Leonard T. Troland as sole named inventor. The 1928 anchor year above falls between filing and grant. The specification covers rolling the dye matrix against the blank under pressure and drawing surplus moisture off at the margins so the dye cannot spread sideways and blur edges.