Interlaced light recording
Interlaced Light Recording (ILR) is a recording method that is used in stop-motion film productions . Instead of photographing the fully illuminated motif, individual headlights or headlight groups of the overall lighting are switched on alternately and the motif is photographed individually with each resulting partial illumination. Only the later merging of these partial images in post-production results in the motif with the overall lighting. The process was developed in England by the filmmaker Tyron Montgomery .
Purpose of the ILR
Even with modern, digital post-production processes, it is difficult or impossible to make selective changes to individual light sources or shadows in a film image.
With interlaced light recording, the light of individual headlights or groups of headlights is recorded on separate film images. In post-production, through regular processing of these partial images, individual changes can still be made to separate light sources, usually changes to colors, contrast or brightness.
In this way, individual shadows can also be enhanced or removed without affecting the shadows of the other light sources. In particular, multiple shadows can be avoided in this way, which would otherwise negatively affect the aesthetics of a film image, without compromising the positioning of the light sources.
technology
The ILR recording process can be carried out with regular film technology, since individual spotlights or groups of spotlights only have to be switched on and off repeatedly during the shooting. However, such switching processes can have a detrimental effect on the service life of the lighting means used. Incandescent lamps are therefore usually dimmed gently .
Gas discharge lamps are unsuitable because they usually only reach their full brightness and a stable color temperature after a certain running time . Some gas discharge lamps can only be switched on again after a cooling period.
LED lamps , which are also increasingly used in stop-motion productions , are not a problem .
ILR is suitable for both analog and digital image recording. In both cases, digital compositing is required to merge the partial images . For this purpose, images recorded in analogue must be converted into digital images by scanning .
Individual evidence
- ↑ Magazine "Animation Aktuell" 03/1999