[Insight-users] sparse images?

[Darren Weber]

I'm working with a very large dataset (1000's of 2D images, size > 1024x1024
pixels, ushort RGB pixels).  A large portion of these images is background.

A few routines, like saving all the 2D images into a 3D volume, fail with
segfaults due to malloc errors (on OSX 10.5.8 with 24Gb RAM; using ITK
3.16.0).

Is there an image format that provides 'sparse' images?  This implies there
are no data values for some of the image pixels (is this the same thing as
transparent background?).

What is an optimal image format for working with this data?

Thanks in advance (TIA),
Darren
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