Shared Options - Raspberry Pi A User Manual

272
THE RASPBERRY PI
and videos, each of which has a variety of options that can control the final output. Options
for
information, see Chapter 15, "The Raspberry Pi Camera Module".

Shared Options

The following options, listed in alphabetical order, are shared between
raspiyuv
raspistill, raspiyuv
Camera Module comes with software designed to capture still images
raspistill, raspiyuv
and raspivid
-? or --help (Help)—Displays all options and their uses.
❍
-awb or --awb (Automatic White Balance)—Sets the colour temperature of the cap-
❍
tured image or video according to one of a series of pre-set configurations. If your
image or video appears blue or orange, try adjusting this option first. Possible values
for this option are:
,
incandescent flash
-br or --brightness (Brightness)—Adjusts the brightness of the captured image or
❍
video. Possible values for this option are whole numbers ranging from 0 (minimum
brightness) to 100 (maximum brightness).
-cfx or --colfx (Colour Effects)—Allows the user to adjust the YUV colour space for
❍
fine-grained control of the final image. Values should be given as U:V, where U controls
the chrominance and V the luminance. A value of 128:128 will result in a greyscale
image.
-co or --contrast (Contrast)—Adjusts the contrast of the captured image or video.
❍
Possible values for this option are whole numbers ranging from -100 (minimum con-
trast) to 100 (maximum contrast).
-d or --demo (Demonstration Mode)—The
❍
in demonstration mode, which displays a preview that cycles through vari-
raspivid
ous camera options. In this mode, no image is captured—even if you specify an output
file using the
--output
-ev or --ev (Exposure Value)—Allows the camera to increase or decrease its exposure
❍
value, brightening or darkening the captured image or video. Unlike the brightness
and contrast settings, this affects the actual capturing of the image or video. Possible
values are -10 to 10, with 0 being the default.
P A R T V
A P P E N D I X E S
and are included in this appendix. For more
raspivid
. For application-specific options, see the individual
and entries later in this appendix.
raspivid
, , ,
off auto sun cloud
, .
horizon
option.
, , ,
shade tungsten fluorescent
option runs either
-d raspistill
raspistill,
,
or