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MrSID Preferences

This page describes the preference options for MrSID Generation 4 (MG4), MrSID Generation 3 (MG3) and MrSID Generation 2 (MG2).

You can set the following preferences for MG2, MG3, and MG4 files:

• Compression ratio preferences. For more information on compression ratios, see Compression Overview.
• Zoom levels preferences. For more information on zoom levels, see Zoom Options.
• Advanced preferences. For more information on advanced options such as weight and block size, see Format-Specific Options Overview.

The MrSID Generation 3 (MG3) and MrSID Generation 4 (MG4) preferences mirror the settings found in the MG3 and MG4 format-specific options on the Advanced Job Options dialog, with the exception that a default compression ratio can be specified for both color and grayscale images. When you add a new MG3 or MG4 encode job, the compression settings are initially set to the values declared on this tab. The effects of these options can be simulated on the Preview tab.

The preference options for MG3 and MG4 are the same with the following exceptions:

• Compression ratio preferences for MG4 include a setting for Multispectral, which by default is set to "Lossless", and a Lossless option can be selected individually for RGB and Grayscale.
• Advanced MG4 preference options include an "Apply RGB Color Transform to First Three Bands" check box to specify that multispectral files whose first three bands are R,G and B (in that order) should have this transform run on them. (This option is enabled by default.)
• Advanced MG4 preference options include two Alpha Source options, one to specify that all pixels are opaque and one to specify that the transparency or "nodata" value should be automatically detected from the image metadata.
• Advanced MG4 preference options include Dynamic Range Metadata Generation options. For more information on generating dynamic range metadata, see Dynamic Range Metadata Generation.
• Advanced MG3 preference options include radio buttons for selecting either the one-pass or two-pass optimizer.

The MrSID Generation 2 preferences mirror the settings found in the MG2 format-specific options on the Advanced Job Options dialog, with the exception that a default encode ratio can be specified for both color and grayscale images. When you add a new MrSID Generation 2 encode job, the encode settings will initially be set to the values declared in this tab.