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This effect is due to the way lightroom interprates colors, "raw" is well named in the meaning that it's supposed to give the direct output from the sensor.
Threfore the Raw interpreter tries to give the most accurate color rendention from that data, and there are différences from one editor to another (look for the output from DXO for example) It is different for other uncompressed format like TIFF that codes directly colors (and therfore shall be consistent from one program to another)
Regarding color rendention, I would better ask a professionnal what is the "best" program around for Pentax raw output (either PEF or DNG)
Benjikan ?
Normally you shall be able to set some specific tuning for the color rendition you like the most. (by tuning saturation, temperature, tint, channels...)
Regards,
Guillaume
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