This option will cause #tjTransform() to return an error if the transform is
not perfect. Lossless transforms operate on MCU blocks, whose size depends
on the level of chrominance subsampling used (see #tjMCUWidth
and #tjMCUHeight.) If the image's width or height is not evenly divisible
by the MCU block size, then there will be partial MCU blocks on the right
and/or bottom edges. It is not possible to move these partial MCU blocks to
the top or left of the image, so any transform that would require that is
"imperfect." If this option is not specified, then any partial MCU blocks
that cannot be transformed will be left in place, which will create
odd-looking strips on the right or bottom edge of the image.
This option will cause #tjTransform() to return an error if the transform is not perfect. Lossless transforms operate on MCU blocks, whose size depends on the level of chrominance subsampling used (see #tjMCUWidth and #tjMCUHeight.) If the image's width or height is not evenly divisible by the MCU block size, then there will be partial MCU blocks on the right and/or bottom edges. It is not possible to move these partial MCU blocks to the top or left of the image, so any transform that would require that is "imperfect." If this option is not specified, then any partial MCU blocks that cannot be transformed will be left in place, which will create odd-looking strips on the right or bottom edge of the image.