6 Dec
2009
6 Dec
'09
5:22 p.m.
On Sun, Dec 6, 2009 at 5:13 PM, Sebastian Redl
I think libjpeg has a way of applying lossless transformations while reading it. Is that correct, or am I mistaken here?
JPEG lossless transformation is a trick performed on the compressed JPEG data (IIUC, you basically shuffle the values in each block), and can therefore not be achieved by using a generic image library that provides a JPEG reader and writer. You need specialized functions that operate on the compressed JPEG data.
Sebastian
Maybe. Then it would make sense to support this by wrapping the jpeg7 function jtransform_perfect_transform