Re: SpeedUp 1bit Processing

> Who has some ideas, may be OpenMP, special routines . . .

Recent versions of ImageMagick have numerous algorithms converted
to OpenMP.  The oil paint method, for example went from 21 seconds
to 6 on a quad-core processor.  The image format readers and writers
are sequential so there little opportunity for a speed up there.
ImageMagick has the advantage of dealing with up to terabyte images but the
disadvantage of not always doing so efficiently.  For example, 1-bit
images are stored internally as 8 or 16-bit red, green, and blue tuples.
Other than ensuring you are using the latest ImageMagick release, try
using the Q8 (8-bits) version rather than the default Q16 (16-bits).
You will definitely get a speed-up with additional memory.  Images that
exceed the memory capacity of the computer are cached to disk which is
deadly slow.  Finally, consider using some other program that efficiently
handles 1-bit images.  ImageMagick was designed to be a general image
processor so we made trade-offs in the design that does not always
translate to speed.