KNOW HOW
gPhoto and gPhoto2
INSTANT
PICTURES
he sad truth about
digital cameras is that
Tmany of the
manufacturers still hold back
on information vital to
getting their product to
communicate with our
computer systems
proprietary code again. This
makes the development of programs that work with
gPhoto enables you to
digital cameras so much more challenging.
load photographs
If you intend to buy and use a digital camera with
Figure 1: gPhoto starting up
a Linux system, you should therefore be cautious
from your digital
about what systems you buy. The list of drivers is supported by the program. If your camera can be
camera onto your
continually growing thanks to some dedicated souls seen as a USB mass-storage device, then it can be
who spend their time and energy reverse-engineering connected to a Linux system. Even though it s not
Linux system. Whether
these for Linux systems. It s very important to check strictly necessary to use gPhoto for this type of
you want to share
these lists before you make a purchase, to ensure a camera, you do get some benefits, including features
suitable driver exists. It s also advisable to get first- like being able to produce thumbnail images and
them via the Internet
hand evidence that the drivers work from someone automatic catalogues for Web pages.
or manipulate them in
who has successfully run the very make and model
you are interested in. Plug and play
Gimp, Colin Murphy is
Even assuming your digital camera is supported by If you ve been wise enough to buy a supported
at hand to show you
a Linux-compatible driver, you ll need an application camera then all you need to do is plug it in and select
to pull the photos from the camera and onto your the port that you have your camera connected to.
all you need to know
machine. This is where gPhoto comes in. gPhoto falls These days this will quite often be a USB port. These
into two separate projects gPhoto and gPhoto2, details can be set in the Select model/port... box,
which in turn comes with a slew of front-ends. which you can get to from the Configuration drop-
The gPhoto developers original project was gPhoto down menu. Once you have this entered you can
a stand-alone graphical application that you can then start to play with the camera and download
use comfortably from the desktop. gPhoto 0.4.3 has images.
support for 105 camera from many different If you have a camera that is a mass-storage USB
manufacturers, with Casio QV, Fuji MX and Kodak device then you need to do things slightly differently.
DC cameras being particularly well supported. The mass-storage USB device actually mounts the
There is another set of digital cameras that can be camera (or disk, or whatever you happen to be using)
used with gPhoto even though they are not directly onto a file directory. You then need to put this file
directory into gPhoto in order for it to see the
Thumbnail images A thumbnail is a copy of an image but in a much reduced size. camera. This is best achieved by going to gPhoto s
Thumbnail images are much easier to deal with quickly, as they load and move much File menu and selecting Open Directory. It depends
faster than their full size counterparts. The filenames given to images downloaded very much on the type of device you have, as to what
from cameras are usually just frame numbers, which doesn t give you an awful lot to the directory name will be once you have passed the
go on, therefore thumbnail images are a useful visual reference telling you what the mass-storage device mount point and this can
file actually is. cause a problem. Because the directory navigation in
gPhoto is not as intuitive as it is in a file browser, for
46
LINUX MAGAZINE Issue 19 " 2002
KNOW HOW
Figure 5: Kamera
with a small, but
ever-growing list of
supported cameras
gPhoto2
Figure 2: Thumbnail images for you to select from
gPhoto2 is a new departure for the
project, with development
concentrating on bringing together
a comprehensive set of libraries so
that others can concentrate their
efforts on writing graphical front-
ends for it. gPhoto2 can be used
from the command line however,
without the need for one of these
graphical front-ends. This allows
Figure 3: Colour setting in gPhoto. With a motley
Figure 6: Nautilus
group of hackers from FOSDEM
you the luxury of automating processes that you
browsing the files
might have to do repeatedly. What you loose in
directly on the camera
good reason, it is sometimes hard to see where the colour you gain in control.
files lie in the camera. The way around this is to Entering a command like:
explore the mass-storage USB directory first with a
# photo2 list-cameras
file browser, like Konqueror. In this way you will be
able to see a full directory layout and select the
appropriate path, which you can then copy into returns the facts:
gPhoto s file system.
Number of supported cameras: 183
Once the camera or directory is selected, gPhoto
Supported cameras:
will start to download images and show them to you
AEG Snap 300 (TESTING)
as thumbnails, as you can see in the Figure 2. You
Agfa CL18
now have the option of selecting from these
thumbnails and having the full-sized file copied over.
Once you have the full file copied you can then start and so on.
to make small adjustments to it, such as adjusting the Concentrating purely on the libraries needed also
colour balance (Figure 3). has the benefit that any graphical front-ends for
Depending on whether or not your camera gPhoto2 need not actually be front-ends at all. The
supports such delights, you might also be able to real advantage is that the application can now be
move and remove files in the camera, as well as embedded into existing utilities, most usefully file
operate the camera remotely and, with some, even browsers, so that you can just plug in your camera
use it as a webcam. and browse away. Examples of this type of
development can be seen in Figures 4 through 6.
Info
gPhoto and gPhoto2 homepage http://www.gphoto.org
Help with USB and the mass-storage devices http://www.linux-usb.org/USB-
guide/x498.html
Help with mass-storage device cameras http://www.harald-schreiber.de
Kamera gPhoto2 front-end www.thekompany.com/projects
/gphoto/
GnoCam http://rzstud1.rz.uni-karlsruhe.de/~
urc8/GnoCam
Figure 4: Here we see how Konqueror has
embedded Gphoto2 applications
47
Issue 19 " 2002 LINUX MAGAZINE
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