Open Printable/Searchable Copy - Global Mapper

Global Mapper User's Manual
The File Type section allows you to choose what type of GeoTIFF file to generate. The various file types are
described below:
• 8-bit Palette Image - This option generates a 256-color raster GeoTIFF file with 8-bits per pixel. The
Palette options described below will apply in this case. This option will generate a relatively small
output file, at the expense of some color fidelity depending on the palette that you choose. The image
data will be compressed using the PackBits compression algorithm.
• 24-bit RGB - This option generates a raster GeoTIFF file with 24-bits per pixel. Uncompressed
GeoTIFF images generated with this option will be at least 3 times the size of those generated with
the 8-bit Palette option, but the colors in the image will exactly match what you see on the screen.
You can also maintain the exact colors while achieving some compression using the LZW
compression option. Selecting the JPEG compression option generates a raster GeoTIFF file with
24-bits per pixel but with the raster data compressed using the JPG compression algorithm. GeoTIFF
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