4.5

46Compressor User Guide
• Default location: Choose an item from the pop-up menu to set the default save location
for transcoded files.
• Image type: Choose an image type from the pop-up menu to set an image type for the
transcoded files:
• DPX
• GIF
• HEIF
• JPEG
• OpenEXR
• Photoshop (PSD)
• PNG (Portable Network Graphics)
• TARGA (Truevision Advanced Raster Graphics Adapter), also referred to as TGA
• TIFF (Tagged Image File Format)
• Color palette: Available when Image type is set to GIF or PNG. The color palette limits
the colors used in the transcoded files. Select Not Indexed to use all available colors.
• Local: Uses a new color palette for each frame.
• Global: Uses a shared color palette across all frames. This method involves two
passes. The first pass analyzes each of the frames, generating a common palette.
The second pass encodes each frame using that common palette.
• Color dithering: Available when a color palette is set to a number of a colors. Dithering
gives the illusion of a color not present in the color palette. For example, a pattern of
yellow and blue can be used to give the impression that green appears in the image.
Dithering can also create what appears to be a smooth gradient using a limited number
of colors in the palette.
• None: No dithering is applied.
• Floyd-Steinberg: Uses the industry-standard Floyd-Steinberg dithering algorithm.
• Sierra2: Uses the Sierra two-line dithering algorithm. Depending on the source,
Sierra2 may produce a smoother image.
• Animated: Available when Image type is set to GIF or PNG, exports a single, animated
file containing all frames (rather than a collection of individual files for each frame).
• Playback: Available when Animated is selected. Playback specifies how many times the
animated GIF or PNG loops during playback. Select Continuously, or enter the number
of times you want the animated image to play. (Not all web browsers will recognize
this option.)
• Create unique output directory: Available when Animated is not selected. Select this
checkbox to create a folder to hold the output files; the files saved will be named
“frame-0,” “frame-1,” “frame-2,” and so on.
• Add leading zeros to frame numbers: Available when Animated is not selected.
Select this checkbox to have Compressor add leading zeros to output filenames
(“filename-000000,” “filename-000001,” “filename-000002,” and so on).