Originally posted by NaClH2O I use Adobe's DNG converter to losslessly compress the DNG after I import them to my computer.
It is not a widely known fact (you will not read about this @ Barry Pearson's DNG scam website at least) that Adobe's own DNG converter will discard a lot of important raw data during the conversion of the native raw format to DNG file.
Thanks to GordonBGood who put a nice summary of how the data contained in the "black masked-to-light" pixels from a sensor can be used, the data that Adobe DNG converter will discard during the conversion w/o any warning of any kind:
"....
1) Use them to measure and back out Wide Band Vertical Patterns in the K10D and K20D.
2) Use them to tweak out the magenta to green tingeing from left to right that the K10D has at high ISO's or for highly boosted as to exposure and contrast images.
3) Use them to eliminate the border tingeing of the K20D that occurs in the same cases as the tingeing of the K10D above as is done using my Raw Border Correction (RBC) utility for the K20D.
4) Use them to measure and eliminate from the raw data the "Thin Green Line" problem of the K-7 for some camera samples when the sensor got warm had it not been fixed with a firmware update from Pentax.
5) Possibly use them to determine a different method of black level compensation for the K-x if necessary if conventional raw conversion methods produce any Horizontal Pattern Noise (HPN)
...." (c) GordonBGood
The point here ? Do not use Adobe DNG converter at all. And stay away from DNG format too.