Film Grain

Quick Reference to Scripting Command
a=FILMGRAIN(width, height, intensity, seed, POLYCHROMATIC)
Items in CAPS are 0/1 switches or switches with more options than 0/1.

Operation Example

This operation adds random noise to the image to emulate the look of film grain. You can control the size of the grains, their intensity or darkness, and the random generation value for the grain pattern. This operation can be used to produce a film grain effect by trending the seed value over a sequence of frames.

Film Grain Operation Dialog

Film Grain Controls

Trends

Some of the controls have a Trend button next to them. These trend buttons allow you to set variables over a series of frames. Each frame of any animation may 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. Trend graphs have equidistantly spaced vertical lines. For animations under 100 frames in length, each of these lines represents a frame in the animation. The number of frames in any one sequence can be altered using the Sequence controls item from 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.

Grain Width

This control allows you to specify the maximum width of a grain region. The width is measured in pixels and can range from 1 to 10 pixels. The width is set using the slide gadget or by entering the appropriate value in the text entry field.

Grain Height

This control allows you to specify the maximum height of a grain region. The height is measured in pixels and can range from 1 to 10 pixels. The height is set using the slide gadget or by entering the appropriate value in the text entry field.

Intensity

The Intensity control allows you to specify the degree of the Film Grain effect in the selected region. The Intensity is a percentage value that ranges from 1% to 100%. A setting of 100% would result in the maximum amount of Film Grain in the selected region. A setting of 1% will result in the minimum amount of Film Grain in the selected region. This control is set by using the slide gadget or by entering the desired value in the provided text entry field.

Seed

The Seed setting allows you to alter the random number variable for the Film Grain operation. Altering this value will result in an alternate grain pattern for each seed value. The Seed parameter ranges from 0 to 9999, but it can set to higher values for Timelines.

WinImages F/x Manual Version 7, Revision 5, Level B