Pentax K-X Operating Manual page 87

Dynamic Range (D-Range)
Indicated with a value expressing the light level reproducible in an image.
This is the same as the term "Exposure latitude" used with silver halide
film.
Generally, when the dynamic range is wide, overexposed and/or
underexposed areas are less likely to occur within the image, and when
the dynamic range is narrow, all image tones can be reproduced sharply
and accurately.
EV (Exposure Value)
Exposure value is determined by the combination of the aperture value
and the shutter speed.
EV Compensation
Process of adjusting the image brightness by changing the shutter speed
and/or aperture value.
Exif (Exchangeable image file format for digital still camera)
A standard digital camera file format established by the Japan Electronics
and Information Technology Industries Association (JEITA).
Exposure Bracketing
For automatically changing exposure. When the shutter release button is
pressed, three images are captured. The first one has no compensation,
the second is underexposed and the third is over-exposed.
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.
ISO Sensitivity
The level of sensitivity to light. With a high sensitivity, images can be shot
with a high shutter speed even in dark places, reducing camera shake.
However, images taken with a high sensitivity are more susceptible to
noise.