Pentax DS2 - Manual (Page 200)

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Appe
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Histogram
A graph that shows the darkest and brightest points in an image. The
horizontal axis represents the brightness and the vertical axis represents
the number of pixels. This is useful when you wish to refer to the exposure
status of an image.
JPEG
An image compression method. The image is recorded in JPEG format
when the quality level is set to C (Best), D (Better), or E (Good).
Images recorded in JPEG format are suited for viewing on your PC or for
attaching to e-mail.
ND (Neutral Density) Filter
A filter with many saturation levels that adjusts the brightness without
affecting the picture itself.
Noise Reduction
Process to reduce noise (image roughness or unevenness) caused by low
shutter speed.
NTSC/PAL
These are video output formats. NTSC is mainly used in Japan, North
America, and South Korea. PAL is mainly used in Europe and in China.
Quality Level
This refers to the image compression ratio. The lower the compression,
the more detailed the image. The image becomes rougher as the
compression rate rises.
RAW data
Unedited image data output from the CCD. RAW data is data before being
internally processed by the camera. Add settings that are added before
shooting in other file formats (such as White Balance, Contrast, Saturation
and Sharpness) individually frame by frame after shooting. In addition,
RAW data is 12-bit data that contains 16 times the information of 8-bit
JPEG and TIFF data. Rich gradations are possible. Transfer RAW data to
your computer and use the provided software to create image data with
different settings, such as JPEG or TIFF.