Use the most accurate DCT/IDCT algorithm available in the underlying codec.
The default if this flag is not specified is implementation-specific. The
libjpeg implementation, for example, uses the fast algorithm by default when
compressing, because this has been shown to have only a very slight effect
on accuracy, but it uses the accurate algorithm when decompressing, because
this has been shown to have a larger effect.
Use the most accurate DCT/IDCT algorithm available in the underlying codec. The default if this flag is not specified is implementation-specific. The libjpeg implementation, for example, uses the fast algorithm by default when compressing, because this has been shown to have only a very slight effect on accuracy, but it uses the accurate algorithm when decompressing, because this has been shown to have a larger effect.