Thanks for the replies. As stated, I'm quite sure that the in camera JPEGs looked the same as the PEFs in UFRAW (a while ago).
I did check UFRAW's settings and they look 'normal' (for a beginner in PP like me).
Below the UFRAW ID file
Code:
<?xml version="1.0" encoding="utf-8"?>
<UFRaw Version='7'>
<InputFilename>/home/fortyfourgalena/Pictures/IMGP7469.PEF</InputFilename>
<OutputFilename>/home/fortyfourgalena/Pictures/IMGP7469.pef2jpg.jpg</OutputFilename>
<Temperature>3811</Temperature>
<Green>1.027631</Green>
<ChannelMultipliers>1.421875 1.000000 1.644531</ChannelMultipliers>
<OutputType>4</OutputType>
<CreateID>1</CreateID>
<Compression>100</Compression>
<BaseLinearCurve Current='yes'>
</BaseLinearCurve>
<LinearCurve Current='yes'>
</LinearCurve>
<sRGBInputProfile Current='yes'>
</sRGBInputProfile>
<sRGBOutputProfile Current='yes'>
</sRGBOutputProfile>
<Make>PENTAX</Make>
<Model>K10D</Model>
<Timestamp>Sat Apr 10 16:04:01 2010</Timestamp>
<Orientation>0</Orientation>
<ISOSpeed>100</ISOSpeed>
<Shutter>1/250 s</Shutter>
<Aperture>F0</Aperture>
<FocalLength>200.0 mm</FocalLength>
<FocalLength35>300.0 mm</FocalLength35>
<EXIFSource>exiv2 0.16</EXIFSource>
<Crop>0 0 3896 2616</Crop>
<Log>
ufraw_open: w:3896 h:2616 curvesize:0
Reseting Exif.Image.Orientation from '1' to '1'
EXIF data read using exiv2, buflen 9148
Warning: Size 8230 of Exif.Pentax.0x0404 exceeds 4096 bytes limit. Not decoded.
Warning: Size 21608 of Exif.Pentax.0x0405 exceeds 4096 bytes limit. Not decoded.
Loading PENTAX K10D image from /home/fortyfourgalena/Pictures/IMGP7469.PEF ...
Black: 0, Maximum: 4095
Scaling with black 0, multipliers 0.864608 0.608076 1.000000 0.608076
Scaling with black 0, multipliers 0.864608 0.608076 1.000000 0.608076
AHD interpolation...
</Log>
</UFRaw>
I know I can adjust, but was a bit shocked that they were not the same; it's between 3/4 and 1 stop difference. Might be the subject that has an effect on how the JPEG engine in the camera works with the brightness.