Selectable Gamma Curves
A vital factor in achieving an appropriate contrast range is
the gamma curve. Gamma determines the transfer
characteristic of a normal exposed scene. For Sony’s digital
camcorders, gamma curves are readily adjustable on
location. The overall (Master) gamma curve of the HDW-
750/730 offers a very natural overall tonal reproduction
because of the 10-bit A/D converter and ADSP (Advanced
Digital Signal Processing) providing multiple gamma points.
While the master gamma can be changed between two
calculating patterns, several fixed master gamma curves are
available per each pattern. These are all accessible and
interchangeable via the set-up menus.
RGB Gamma Balance
By changing the RGB gamma balance it is possible to
change the color balance of the mid-tones without affecting
black or white balance.
Variable Black Gamma Range
Variable Black Gamma Range function allows fine
adjustment of tonal reproduction in the shadow area. This
feature can help to bring out details from the dark parts of
the picture without affecting mid-tones while maintaining
absolute black level. The variable range is LOW, MID and
HIGH.
Black Stretch
When Variable Black Gamma Range function is performed, it
can be limited to picture luminance without affecting any
other factors of the video signal. It is particularly helpful for
dark scenes when the black has to stay black, but there is a
requirement to pull out more detail.
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Contrast Range
The HDW-750/730 can handle a very wide contrast range.
A number of useful features are readily available to aid the
operator to more precisely reproduce any given scene.
Creative possibilities are offered by modifying “gamma
settings”, offering a great advantage to achieving a desired
‘look’.
Normal
Red Channel Enhancement
Normal
Variable Black Gamma Range Function ON
Gamma Calculating Pattern A
No.1: SMPTE 240M (Initial Gain 4.0)
No.2: ITU-R.BT709 (Initial Gain 4.5)
No.3: BBC Gamma setting (Initial gain 5.0)
Gamma Calculating Pattern B
No.1: Sensitivity is equivalent to 50 ISO
No.2: Sensitivity is equivalent to 100 ISO
No.3: Sensitivity is equivalent to 200 ISO
