Introduction to the rpc, What the rpc cannot do – ARRI Ramp Preview Controller User Manual
Page 9
RPC Operations Guide, Page 9
Introduction To The RPC
A unique feature of the current generation of Arriflex film cameras is their ability to change camera
speed while the camera is running. Such a speed change is called a “ramp”. Even though ramps are
used extensively by some technology savvy DPs, others shy away because of the costly trials and
errors involved in learning their proper use. Until now, previous experience has been the only way to
judge the ramp settings to use on the set, since no method for accurate pre-visualization existed.
All that has changed with the introduction of the ARRI Ramp Preview Controller software (RPC). Now
the result of a ramp can be instantly previewed during pre-production or on the set, avoiding costly
mistakes and re-shoots.
Using the RPC is simple. During a rehearsal the video assist is digitized into a Desktop or Laptop
computer. Ramp settings are entered into the RPC and a preview of the effect is played back. Ramp
settings can then be adjusted and the result can be viewed immediately to find the best settings for
the desired effect. Because this can be done during blocking or pre-lighting, the RPC will integrate
smoothly into the workflow on the set. Once a ramp is decided upon, the RPC can be connected to
the film camera to shoot the ramp on film.
What the RPC Cannot Do
To use the RPC in a useful manner, it is important to understand what it can and cannot do.
The RPC can show how the speed of an action will change when a ramp is used to film the action.
It cannot show any shutter related effects like motion blur or strobing, and it does not concern itself
with the image quality, i.e. no steps have been taken to attempt to emulate the “film look” or change
the image in any other way. It will not show any changes in exposure when the shutter angle is set
incorrectly.
The RPC currently has no video capture features. This will have to be done with third party software.
The ARRI Technical Note “P-1026 RPC Video Capture” discusses this subject in detail.