Pattern: Auto usually works; otherwise, RGGB is most common.

Combined luminance: color components are combined into a single luminance channel.
Combined RGB: color components are combined into a single file, retaining color.
Split RGB: color components are split into separate files, one file per color.

Superpixel: Combines 4 pixels into 1, effectively halving the width and height of the image.
Bilinear: Retains image dimensions, using bilinear interpolation to compute pixel values.
VNG: Variable Number of Gradients.  Computes pixel value according to 8 surrounding pixels.
