This option is only available for MrSID Generation 3 (MG3) images. The 1-pass and 2-pass optimizer parameters affect encoding performance and memory usage. Although not as fast as the 1-pass optimizer, the 2-pass optimizer requires much less memory because it splits the encoding operation into two passes. This is required for very large files.
Note that the Estimated Memory Usage value is only displayed when the 2-pass optimizer is used.
The 2-Pass optimizer is automatically used for Area of Interest encoding even if this check box has not been selected.
By default the 2-Pass Optimizer is used.
NOTE: Encoding with the 1-Pass Optimizer is faster but requires that the entire image be loaded into memory. If the computer does not have enough memory, the job does not succeed.