- image_info: bit order
- dry-run option (don't process, only print info)
- png: raw read
- gif: raw reading, depth always 8?
- predictors
- tiff: tiled, planar, raw jpeg/ccitt/flate, bit/byte order
- specify paper size as pair of dimens
- supply colorimage emulation for level1 (rgb-8 done)
- internal documentation

- pdf output
- rotation support
- support for more graphics formats
- compress palette
- masking (1-bit alpha channel)
- preview
- (optional) language level check in PostScript code
- more regression tests
- force specific color space / depth
- force portrait/landscape/bbox
