4.5

36Compressor User Guide
• Lanczos 2: Adjacent pixel values are averaged using a truncated sinc function. This
option is slower than Gaussian but provides sharper results.
• Lanczos 3: Similar to Lanczos 2 but averages more pixel values. This option is slower
than Lanczos 2 but may produce better results.
• Bicubic: Adjacent pixel values are averaged using a bicubic function. The processing
time and output are most similar to Lanczos 2 and Lanczos 3.
• Anti-aliased (Best): Provides the highest output quality, but can take substantially
longer to process.
• Retiming Quality: This pop-up menu sets the retiming method. There are four options:
• Fast (Nearest Frame): Linearly interpolates frames using nearest neighbor frames.
• Good (Frame Blending): Blends neighboring frames using a filter to produce good-
quality interpolation.
• Best (Motion Compensated): Uses optical flow to interpolate using areas of
movement between neighboring frames to produce high-quality output.
• Reverse Telecine: Removes the extra fields added during the telecine process to
convert the film’s 24 fps to NTSC’s 29.97 fps. Choosing this item disables all the
other Quality controls. See Use reverse telecine in Compressor.
• Adaptive details: Select this checkbox to use advanced image analysis to distinguish
between noise and edge areas during output.
• Anti-aliasing level: Sets the softness level in the output image. Double-click the value
and then manually enter a new value or drag the slider to the right to increase softness.
This property improves the quality of conversions when you’re scaling media up. For
example, when transcoding SD video to HD, anti-aliasing smooths jagged edges that
might appear in the image.
• Details level: Sets the amount of detail in the output image. Double-click the value and
then manually enter a new value or drag the slider to set the value. This sharpening
control lets you add detail back to an image being enlarged. Unlike other sharpening
operations, the “Details level” property distinguishes between noise and feature details,
and generally doesn’t increase unwanted grain. Increasing this value may introduce
jagged edges, however, which can be eliminated by increasing the “Anti-aliasing level”
slider.
• Dithering: When selected, adds a certain type of noise to images to prevent large-scale
distracting patterns such as color banding. If your image has excessive noise after
rendering, deselect this checkbox.
Video effects
For a list of available video effects and instructions on how to add a video effect to a
setting, see Add and remove effects in Compressor.
Audio properties
• Channel layout: Use the pop-up menu to set the audio channel layout.
• Sample rate: Use this pop-up menu to set the number of times per second that music
waveforms (samples) are captured digitally. The higher the sample rate, the higher the
audio quality and the larger the file size.
• Quality: Use this pop-up menu to select the quality of the audio output.