-o

produces a ONE_LEVEL output file (default)

-m

produces a MIPMAP_LEVELS output file

-c

the output file will be a cube-face environment map (default)

-l

the output file will be a latitude-longitude environment map

-w x

sets the width of the output image to x pixels (default is 256). The height of the output image will be x*6 pixels for a cube-face map, or x/2 pixels for a latitude-longitude map.

-f r n

sets the antialiasing filter radius to r (default is 1.0) and the sampling rate to n by n (default is 5 by 5). Increasing r makes the output image blurrier; decreasing r makes the image sharper but may cause aliasing. Increasing n improves antialiasing, but generating the output image takes longer.

-t x y

sets the output file’s tile size to x by y pixels (default is 64 by 64)

-p t b

if the input image is a latitude-longitude map, pad the image at the top and bottom with t*h and b*h extra scan lines, where h is the height of the input image. This is useful for images from 360-degree panoramic scans that cover less than 180 degrees vertically.

-d

sets level size rounding to ROUND_DOWN (default)

-u

sets level size rounding to ROUND_UP

-z x

sets the data compression method to x (none/rle/zip/piz/pxr24, default is zip)

-v

verbose mode

-h

prints these options