Pentax K-5 Operating Manual page 198

You can convert captured RAW files into JPEG or TIFF files.
Only RAW files captured With this camera can be edited. RAW files and JPEG
files captured with other cameras cannot be edited on this camera.
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4
Select a RAW image in Playback mode.
Press the four-way controller (•).
The playback mode palette appears.
Use the four-way controller (• • < • ) to select _w (RAW
Development) and press the OK button.
The screen to select a development method is displayed.
Use the four-way controller (• •)
to select [Developing a Single
Image] and press the OK button.
The parameters recorded in the image
file appear.
You can turn the front e-dial (:'_;) to
select a different image.
To specify the parameters before
developing, refer to "Specifying the
Parameters" (p.274).