Hardware Reference
In-Depth Information
❍
overscan_bottom
—his can be used to skip a number of pixels from the bottom of
the display. Typically, the values for all the
overscan_
settings would be the same,
creating a regular border around the display.
❍
disable_overscan
—If you use a monitor or TV via HDMI, you may ind that your
image has a black border around it. To get rid of this border, any default overscan set-
tings can be disabled by setting this value to
1
.
❍
framebufer_width
—his value is measured in pixels, and adjusting it will change
the width of the console. If text appears too small on your screen, try changing this to
a lower value than the default width of the connected display.
❍
framebufer_height
—his afects the size of the console in the same way as
frame-
buffer_width
, but vertically rather than horizontally.
❍
framebufer_depth
—Controls the colour depth of the console in bits per pixel. he
default is 16 bits per pixel, which gives 65,536 colours. Other values, including 8 bits
per pixel (256 colours), 24 bits per pixel (around 16.7 million colours) and 32 bits per
pixel (around 1 billion colours) are valid, but may cause graphical corruption.
❍
framebufer_ignore_alpha
—Set to
1
, this value disables the
alpha channel
, which
controls transparency in the console. Disabling the alpha channel is not normally
required, but may correct graphical corruption caused when setting
framebuffer_
depth
to 32 bits per pixel.
❍
sdtv_mode—
his value afects the analogue composite video output of the Pi, adjust-
ing it to operate in various countries. By default, the Pi uses the North American ver-
sion of the NTSC video standard; users in other countries may need to change this
value to get a picture on an analogue TV. Possible values are:
•
0
—NTSC, the North American video standard
•
1
—NTSC-J, the Japanese video standard
•
2—
PAL, the video standard for the UK and other countries
•
3
—PAL-M, the Brazilian video standard
❍
sdtv_aspect—
Controls the aspect ratio of the analogue composite output. If the pic-
ture looks stretched or squished, alter this to correspond to your TV's aspect ratio.
Possible values are:
•
1
—4:3 aspect ratio, common on older sets
•
2
—14:9 aspect ratio, common for smaller widescreen TVs
•
3
—16:9 aspect ratio, common for modern widescreen TVs
