This was useful when duplicating films, because only one strip of 35 mm had to be processed.
2.
The bottom layer of the duplicating film ( the thermoplastic layer ) is heated above its softening point and pressed against the stamper, so that it takes up its shape.
3.
Any scratches, abrasions, etc ., in the film base cause the light to bend such that the duplicated film ends up with bright or dark ( depending on whether copying from a negative or positive original ) copies of the scratches.
4.
Acquiring the matte film element ( as a first-generation original ) at the same time as the live action makes a much better fit during optical printing, because it requires fewer separate, duplicate film generations than does bluescreen ( though both processes degrade the image and introduce more " error " to the resulting matte ) in the process of achieving sufficiently dense mattes.
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