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Dataset Contents: Numbers
¥ Different types of
numbers can be stored in datasets
H 8 bit bytes (e.g., from grayscale
photos)
H 16 bit short integers (e.g., from
MRI scanners)
o Each
sub-brick may also have a floating point scale factor a attached,
so
that ÒtrueÓ value in each voxel is actually a×(value
in dataset file)
H 32 bit floats (e.g., calculated
values; lets you avoid the a)
H 24 bit RGB color triples (e.g.,
JPEGs from your digital camera!)
H 64 bit complex numbers (e.g., for
the physicists in the room)
¥ Different sub-bricks are allowed to have different numeric types
H But this is not recommended
H Will occur if you ÒcatenateÓ two dissimilar datasets together
(e.g.,
using 3dTcat or 3dbucket commands)
oPrograms will display a warning to the screen if you try
this
