The Digital Fact Book - Quantel

CColor Transform Language (CTL)Color Transformation Language is a small programming language designed to serve asa building block for digital color management systems. It allows users to describe colortransforms in a concise and unambiguous way by expressing them as programs thatdescribe the transform that can be applied to pixel data. It is designed to run fast, operatingon many pixels at one time.See also: OpenEXRWebsite: http://ampasctl.sourceforge.netConvergence (Stereoscopic)In human eyesight, convergence is the ability of our eyes to divert eye optical axes horizontallyin an inward direction. The convergence ‘near point’ is the closest point which is still possibleto perceive one image. In practice, the eyes can easily converge inward but have much lessability to diverge outward, as it is something we don’t do in life and only when looking at 3Dimages that have positive parallax beyond the individual human interocular.In cameras – ‘toeing’ of the cameras (to simulate the eyes converging) to focus on a depthpoint in the scene, either in front of, behind or at the point of interest. The ‘convergencepoint’ is where the axes of toed in cameras align on the Z-axis. Convergence can be adjustedin post production by horizontal movement. Note that sometimes the term ‘vergence’ is usedto describe both convergence and divergence.Convergence pullers are camera-crew members on a Stereoscopic shoot who areresponsible for setting up and shifting the convergence during a shot.See also: ParallaxC-modeIn videotape editing, operating in C-mode allows the shots on the source footage reels tobe copied to the edit tape in the order they are recorded on the source tapes, rather thanthe order required for the finished program. So all the selected material from a source reelcan be copied before loading another source reel – thus saving spooling and reel changingtime. This assumes that none of the edits will need to be changed along the way!The term lives on in the disk-based editing world as the editing disk store can randomlyaccess the footage recorded from the source tape. So C-mode editing on disks not onlygives the advantages of faster and more convenient transfers but the edits can be moreeasily altered in a disk store’s random access environment.42