User Manual - pancroma

IMPORTANT NOTE: Saving and opening large .jpg files can be a problem dueto the nature of JPEG file writing algorithms, especially if your computer has lessthan 1GB RAM. For example, you may not be able to successfully save verylarge subset file sets in .jpg format. Although PANCROMA TM is written tominimize internal storage expense, the file native JPEG file compression routinesrequire significant storage and processing resources. The maximum size of thesubset files that you can store will depend on the RAM resources of yourcomputer. In general, .jpg format requires more processing resources than .bmpor .png.PANCROMA TM is also capable of subsetting three band files of the same size.This utility is useful for gap filling images and for other purposes and is describedin subsequent sections. In order to subset three files, load three Landsat orSPOT images and select ‘Band Combination | ‘Subset Images’ | ‘Subset ThreeBands’. You will then have two menu options: ‘8-Bit or 16-bit to 8-Bit Band Files’or alternatively 16-Bit to 16-Bit Band Files’. The first selection will accept either8-Bit or 16-Bit band files and process them so that 8-Bit GeoTiff band files can besaved. The other option will accept 16-Bit input files and process them so that16-Bit Band files will be saved. The subset selection process is identical to thatused to subset four bands. However when you select ‘Enter’ the subset imageswill be presented immediately rather than upon saving.41