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§ 16.143 - Flicker
| Quick Reference to Scripting Command |
| a=FLICKER(seed, prob(1/X), max, min) |
| Items in CAPS are 0/1 or ranges with more options than just 0/1. Ranges other than 0/1 are indicated by brackets, such as [0-2]. |
Operation Example
This operation is made for animation. It gives the illusion of film that was developed or exposed unevenly. This is a random operation, you can choose the probability of the brightness changing, as well as how much it can flicker.
§ 16.143.1 - Jitter Controls
§ 16.143.1.1 - Trends
Operator dialog controls that have a Trend button next to them offer animation functionality. Trend allows you to set that variable over a set of frames. Each frame of the animation can be thought of as a slice of time. The trends allow you to alter some, all, or none of the variables for a particular time slice. Variables that have multiple states can be set to any of a number of values in the trend. Variables that are either on or off can only have an on or off value in the trend. You will notice that the trend graphs have equidistantly spaced vertical lines. Each of these lines represents a frame in the animation. The number of frames can be altered using Sequence controls... in the TimeLine pull down menu. Animation lengths of 100 - 999 frames will be represented with a vertical bar being 10 frames, and animation length greater than 1000 frames will have a vertical bar for every 100 frames. Click here to view more information on Trends.
§ 16.143.1.2 - Seed
This is the seed for the random number generator. Using the same seed will provide repeatable results.
Note:
When adding a film flicker to an animation, trending the seed is advised. If the same seed is used in every frame of the animation, the same result will be produced every time. Trending the seed will give random effects.
It's not necessary to make the trendline for seed erratic or somehow random, a simple sloping line will produce a unique set of random numbers every step of the way. more on trends.
§ 16.143.1.3 - Probability
This is the probability that the frame will flicker. You can think of the value entered as "The film will flicker every this many frames, on average." A value of 1 will insure that the frame will flicker every time. A value of 100 would mean the film only flickers every 100 frames, on average.
§ 16.143.1.4 - Max Change
This is the maximum percentage change that the film can flicker. A value of 100 would mean that the brightness can change up to double its current brightness. This value can be negative, it means that the frame will darken.
§ 16.143.1.5 - Min Change
This is the mimimum percentage change that the film can flicker. A value of 10 would mean that the brightness can change to no less than 110% its current brightness. This value can be negative, it means that the frame will darken.
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WinImages F/x Manual Version 7, Revision 6, Level A
