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Sure, better pictures are better than bad ones 
By redoing a new capture I saw that the color difference was not so much due to PowerDVD's color correction, since I got a similar result with the current version of MPC.
I guess that my "bad" captures are due to an old version of MPC and/or the fact that some came from a divx (which was not a pirated copy, as I did that copy myself from an original DVD that a friend lent me - such copy is legal in Belgium).
By redoing a new capture I saw that the color difference was not so much due to PowerDVD's color correction, since I got a similar result with the current version of MPC.I guess that my "bad" captures are due to an old version of MPC and/or the fact that some came from a divx (which was not a pirated copy, as I did that copy myself from an original DVD that a friend lent me - such copy is legal in Belgium).