Eyeon:Manual/Fusion 6/Letterbox

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Letterbox

[ Main Manual Page ]


Letterbox [Lbx]

Image:Icon_Letterbox.png

Use the Letterbox Tool to adapt existing images to the frame size and aspect ratios of any other format. The most common use of this tool is to adapt film resolution images to NTSC or PAL sized frames for viewing on an external television monitor. Horizontal or vertical black edges are automatically added where necessary to compensate for aspect ratio differences.

Contents




Controls Tab


Formats Context Menu

Place the pointer on the Aspect X or Y control and press the right mouse button to display a menu with available frame formats. Select any one of the choices from the menu to set the Height, Width and Aspect controls automatically, or enter the required information manually.


Width And Height

The values of these controls determine the size of the output image as measured in pixels.


Pixel Aspect X And Y

The controls determine the Pixel Aspect Ratio of the output image.


Center X And Y

This center control repositions the image window when used in conjunction with Pan-And-Scan mode. It has no effect on the image when the tool is set to Letterbox mode.


Mode

This control is used to determine the Letterbox tool's mode of operation.


Letterbox/Envelope

This corrects the aspect of the input image and resizes it to match the specified width.


Pan-And-Scan

This corrects the aspect of the input image and resizes it to match the specified height. If the resized input image is wider than the specified width, the center control can be used to animate the visible portion of the resized input.

Filter Modes

Nearest Neighbor

This skips or duplicates pixels as needed. This produces the fastest but crudest results.

Box

This is a simple interpolation resize of the image.

Linear

This uses a simplistic filter, which produces relatively clean and fast results.

Quadratic

This filter produces a nominal result. It offers a good compromise between speed and quality.

Cubic

This produces better results with continuous tone images but is slower than Bi-Cubic. If the images have fine detail in them, the results may be blurrier than desired.

Catmull-Rom

This produces good results with continuous tone images which are resized down. Produces sharp results with finely detailed images.

Gaussian

This is very similar in speed and quality to Bi-Cubic.

Mitchell

This is similar to Catmull-Rom but produces better results with finely detailed images. It is slower than Catmull-Rom.

Lanczos

This is very similar to Mitchell and Catmull-Rom but is a little cleaner and also slower.

Sinc

This is an advanced filter that produces very sharp, detailed results, however, it may produce visible `ringing' in some situations.

Bessel

This is similar to the Sinc filter but may be slightly faster.

Window Method

Some filters, such as Sinc and Bessel, require an infinite number of pixels to calculate exactly. To speed up this operation, a windowing function is used to approximate the filter and limit the number of pixels required. This control appears when a filter that requires windowing is selected.


Hanning

This is a simple tapered window.

Hamming

Hamming is a slightly tweaked version of Hanning.

Blackman

A window with a more sharply tapered falloff.

Kaiser

A more complex window, with results between Hamming and Blackman.

Most of these filters are useful only when making an image larger. When shrinking images, it is common to use the Bi-Linear filter, however, the Catmull-Rom filter will apply some sharpening to the results and may be useful for preserving detail when scaling down an image.





Example

Image:F6_example_ResizeFilters.png


Different Resize Filters. From left to right: Nearest Neighbor, Box, Linear, Quadratic, Cubic, Catmull-Rom, Gaussian, Mitchell, Lanczos, Sinc, Bessel






Tips for Letterbox (edit)

EyeonTips:Manual/Fusion 6/Letterbox



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