Setting QuickTime one source filter effects

When setting effects for one source filters (see Adding and applying one source filter tracks), you can set the following filter effects in the Select Effect dialog box:

Alpha Gain

Manipulates the alpha channel of a single track. This operation is commonly applied before passing the track to the Alpha Compositor effect. You can set these options:

• Bottom pin is the minimum value that the alpha channel can take after the gain and offset parameters have been applied.
• Top pin is the maximum value that the alpha channel can take after the gain and offset parameters have been applied.
• Gain is the value multiplied by the original alpha channel value.
• Offset is the value added to the old alpha channel, after it has been multiplied by the gain parameter.

Blur

Applies a convolution blur effect to a single track. You can control the amount of blurring. The larger the value, the longer the effect takes to run and the greater the degree of blurring.

Brightness and Contrast

Adjusts the brightness and contrast of the track. The default value is 0. Values between -100 and 0 decrease the brightness and contrast; values between 0 and 100 increase the brightness and contrast.

Color Style

Lets you apply two color change effects to a single track. Both effects process the red, green, and blue components of each pixel independently. You can set these options:

• Solarization adjusts the color balance of the source track by generating a table of replacement color values from two parameters. The table values start at zero intensity and increase to the maximum intensity at the peak point. After that, the values fall back to zero. You can change the Solarize Amount, the intensity of the solarization table, and the Solarize Point (the peak point of the solarization table).
• Posterization reduces the number of colors in an image by replacing all pixels with colors in a consecutive range within the middle color from that range. This helps to control "color banding." Posterize Amount determines the number of colors that are grouped and replaced with the mid-range color.

Color Tint

Converts the track to grayscale and then applies a light and a dark color to the image.The light color replaces the white in the grayscale image, and the dark color replaces the black. The end result is a tinted duochrome version of the source image. Tint Type lets you select from a choice of five different tints, including Black and White, X-Ray, Sepia, Cobalt, and Other. Other enables these options:

• Light or Dark color replaces the white or black of the grayscale image.
• Brightness adjusts the brightness of the source between -255 (all colors replaced with black) and 255 (all colors replaced with white).
• Contrast adjusts the contrast of the source between -128 (minimum contrast) and 128 (maximum contrast).

ColorSync

(Mac OS only) Adjusts the color balance of an image to match a specified color sync profile. Typically, you would use this to adjust the color profile of an image to match the current display device. This lets you maintain accurate color representations across devices. You specify both the color sync profile of the source image and the color sync profile of the destination device the image is displayed on. You can select these options:

• Source profile for the source image.
• Destination profile for the target device.
• Matching Option for adjusting converted colors: Peripheral (photos), Saturation (graphics), Absolute Colorimetic (logos), Relative Colorimetic (logos).

Edge Detection

Applies an edge detection convolution to a single track. The performance of the edge detection is determined by the convolution kernel. This is a matrix of values applied to each pixel of the source to produce the resulting image. You can select these options:

• Edge thickness--the larger the value, the thicker the edges in the resulting image.
• Colorize Result to colorize the edges based on the color of the source pixels around them. Deselect this option to render edges as light gray against a dark gray background.

Emboss

Applies an emboss convolution to a single track. The higher the value, the heavier the embossing effect.

Film Noise

Simulates effects that are seen on aged film stock. It can be used to make a video source appear as if it has suffered the effects of age and wear. The film noise effect offers the options of hairs and scratches. These simulate hairs lying on the surface of the film, and vertical or near-vertical one-pixel lines that simulate scratches. Five parameters can be adjusted to control the visual impression:

• Hair density: This parameter controls the number of hairs that are drawn on each frame and the frequency with which they appear.
• Hair length: The maximum length (in pixels) of the hairs being drawn.
• Scratch density: This parameter controls the number of scratches that are drawn on each frame and the frequency with which they appear.
• Scratch duration: The maximum number of frames in which each scratch appears.
• Scratch width: The maximum width, in pixels, of a scratch.

General Convolution

This effect applies a general-purpose convolution effect to a single track. The effect that results is determined by the values entered into the kernel parameters of the effect. The kernel for this convolution is a 3-by-3 matrix of values consisting of cells 1 through 9.

The convolution algorithm examines every pixel of the source and the eight pixels surrounding it. These values are multiplied by the appropriate values in the cells and summed. This sum is then used as the value of the corresponding destination pixel.

HSL Balance

This filter effect lets you independently adjust the hue, saturation, and lightness channels of a single track. The HSL balance filter effect has three parameters:

• Hue: Adjusts the hue channel value of each pixel.
• Saturation: Adjusts the saturation channel value of each pixel.
• Lightness: Adjusts the lightness channel value of each pixel.

Lens Flare

This filter produces a sunspot effect. The Lens Flare filter has two options: Intensity and Flare Center, and Flare Type. The Intensity and Flare Center option has three parameters:

• Size: Adjusts the flare center size. 1.0 is a small sunspot in the center of the image, and the increasing values expand the flare until the flare covers the entire image at 2.0.
• Brightness: Adjusts the brightness of the flare. 0.0 is transparent and 1.0 is the most opaque.
• Flare Center: The X and Y axis settings adjust the horizontal and vertical motion dispersion of the flare.

The Flare Type option visually displays the type of flare image being used.

RGB Balance

The RGB balance filter lets you independently adjust the red, green, and blue channels of a single track. The RGB balance filter has three parameters:

• Red multiplier: Adjusts the red channel value of each pixel.
• Green multiplier: Adjusts the green channel value of each pixel.
• Blue multiplier: Adjusts the blue channel value of each pixel.

Sharpen

This effect applies a convolution sharpen effect. The sharpening that is applied is determined by the convolution kernel. This is a matrix of values that are applied to each pixel of the source track. The sharpen filter effect has two parameters:

• Amount of sharpening: This menu gives you a choice of seven values, from 1 (least) to 7 (most). The higher the value, the faster the effect runs and the greater the degree of sharpening.
• Brightness: The default value of 1.0 sharpens the source track but doesn't change its brightness. Values between 0.0 and 1.0 decrease brightness; values greater than 1.0 increase brightness.