Pentax PHOTO Browser 3 Operating Manual page 107

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TIFF-8
A file format for saving image data. Each image is recorded with 8-bit RGB
data for each color. The image is not compressed leaving the file size
large, but no deterioration of image quality occurs.
TIFF-16
Although TIFF images are usually 8-bit, this is a 16-bit TIFF. More computations
are required when image processing as the dynamic range is larger.