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On Screen Troubleshooting: Difference between revisions
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Jitter is often printed in - this can be especially evident on subtitled films with [[laser subtitles]], where the subtitles will appear perfectly steady on screen but the image will still move. Printed in jitter is often more of a gentle bounce than a shaking movement and is commonly caused by high speed release printing, which was especially popular in the mid 90s - 2000's to satisfy high print runs with tight turnaround times. | Jitter is often printed in - this can be especially evident on subtitled films with [[laser subtitles]], where the subtitles will appear perfectly steady on screen but the image will still move. Printed in jitter is often more of a gentle bounce than a shaking movement and is commonly caused by high speed release printing, which was especially popular in the mid 90s - 2000's to satisfy high print runs with tight turnaround times. | ||
Jitter can be especially noticeable if frame lines are visible on screen due to overcut aperture plates or lack of masking, which will direct the audience's gaze to a jittering straight frameline. | |||
=Weave= | =Weave= | ||
Lateral (side to side) movement. The most common mechanical cause is worn, dirty, or damaged [[lateral guide rollers]]. Less common is excessive play in the Starwheel Shaft Thrust Collar, which would cause the intermittent sprocket to move from side to side during projection. Weave can also be caused by film [[shrinkage]], and can also be printed in. | Lateral (side to side) movement. The most common mechanical cause is worn, dirty, or damaged [[lateral guide rollers]]. Less common is excessive play in the Starwheel Shaft Thrust Collar, which would cause the intermittent sprocket to move from side to side during projection. Weave can also be caused by film [[shrinkage]], and can also be printed in. | ||
=Visible Negative Splices= | |||
If scope, movietone, full aperture, or 70mm films are projected slightly out of frame, if the projectors' aperture plates are overcut, or if a film has sloppily made negative splices, white flashes will appear at the top and/or bottom of the frame at every shot change (sometimes several dozen times over the course of a reel!). Care must be taken to monitor framing closely, as the exact location of these splices can change from reel to reel depending on how the film was printed. | |||
The standard aspect ratio for scope films was eventually changed from 2.35:1 to 2.39:1 to account for thicker splices, which is helpful but does not fully eliminate the problem. | |||
Many 16mm film negatives are cut single strand, so that even the most carefully made splices are visible on screen. In this case the projectionist doesn't have much control over splices appearing on screen, though you may be able to adjust the framing to split the difference. | |||
[[Category:Troubleshooting]] | [[Category:Troubleshooting]] | ||