Raspberry Pi A User Manual page 257

C H A P T E R 1 5
Sometimes the position of the Camera Module's cable makes it difficult to place the camera
the right way up. If your preview appears upside-down, use the -vf (vertical flip) option to
correct the image. Just add the option to the command line along with any other options you
are using.
When the preview has finished, the
. When using the
capture.jpg
Currently supported file types include bitmap (BMP), Portable Network Graphics (PNG) and Graphic
Interchange Format (GIF) images. To save a PNG, for example, use the following command:
raspistill -o testcapture.png -e png
Altering to read ,
png bmp
forget the option, a file will still be saved but regardless of its extension the content will
-e
be JPEG data.
Another pair of commonly used options adjusts the width and height of the captured image.
This is good for capturing low-resolution stills as part of a computer vision project, or simply
to save space.
The width of the captured image is adjusted with the
with . These options are most commonly used together, to set the overall resolution of the
-h
image. To capture an image of 1,920 pixels wide by 1,080 pixels high—the same resolution
as a Full HD high-definition TV or Blu-ray film—type the following command:
raspistill -w 1920 -h 1080 -o fullhdcapture.jpg
The final basic option to know is
shows a five-second live preview before capturing an image; the
raspistill
overrides this default. The required delay should be specified in milliseconds. To capture an
image after a 10-second delay, use the following command:
raspistill -t 10000 -o tensecondcapture.jpg
To disable the delay and capture immediately—a useful trick if you're running the software
from a shell script, as demonstrated later in this chapter—use a value of
command:
raspistill -t 0 -o instantcapture.jpg
T H E R A S P B E R R Y P I C A M E R A M O D U L E
(output) option will save a JPEG file with the name
-o
option, you can change the type of file saved with
-o
or allows access to the other supported formats. If you
gif jpg
, which controls the preview time-out. By default,
-t
option, while the height is adjusted
-w
as in the following
0
TIP
test-
-e.
option
-t
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