digital photography with gnome - figuiere.net · digital photography with gnome hubert figuiere ...
TRANSCRIPT
![Page 1: Digital Photography with GNOME - figuiere.net · Digital Photography with GNOME Hubert Figuiere GUADEC 6 Stuttgart, Germany, May 31st 2005. Digital Photography](https://reader033.vdocuments.mx/reader033/viewer/2022050213/5f5f3dc210d7f45db5720232/html5/thumbnails/1.jpg)
Digital Photography with GNOMEHubert Figuiere <[email protected]>
GUADEC 6Stuttgart, Germany, May 31st 2005
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Digital Photography with GNOME
● Getting pictures out of the camera● Archiving● Viewing and sorting● Decoding● Editing
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This presentation is 100% recyclable
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Why ?
● Because lot of people want to use their digital camera
● Lot of geeks still end up using Windows or MacOS– Adobe Photoshop CS– RAW processing: ACR, C1, or manufacturer's
● Because we all want freedom● Because I wanted to talk about that
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Views...
● Personal view because– Everybody has its own way– To provide an example– To share
● This is not the one true way of doing things
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Part 1
Getting pictures from the camera
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Getting pictures from the Camera
● With a card reader– USB or PCMCIA
● With the USB cable
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With a card reader
● Simple● Efficient● Fast
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With the USB cable
● No need for an accessory
● Can be tricky● Limited to the
camera capabilities– Some don't allow file
deletion● May be slow
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How to connect ?
● Using Mass Storage● Using libgphoto2
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Mass Storage
● as simple as the card reader
● mounts like a disk– most distro
automount things● browsed like any file
system– use your favourite
file manager
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Which cameras are Mass Storage ?
● Olympus (since 2001)● Nikon (since 2001)● Minolta
– might require Linux kernel patch● Casio
– might require Linux kernel patch● Sony● Fuji
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Example: Olympus C-370
● Connect USB cable to camera● Select “PC” option on the camera● And voilà...
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Example: Olympus C-370
$ dmesg....ohci_hcd 0001:01:19.0: wakeupusb 2-1: new full speed USB device using address 9scsi2 : SCSI emulation for USB Mass Storage devices Vendor: OLYMPUS Model: X450/D535Z/C370Z Rev: 1.00 Type: Direct-Access ANSI SCSI revision: 02SCSI device sda: 256000 512-byte hdwr sectors (131 MB)sda: assuming Write Enabledsda: assuming drive cache: write through /dev/scsi/host2/bus0/target0/lun0: p1Attached scsi removable disk sda at scsi2, channel 0, id 0, lun 0USB Mass Storage device found at 9
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Olympus C-370 on the desktop
● Appears as a new disk in Nautilus
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libgphoto2● THE library to
access digital cameras (that are not Mass Storage)
● written without help and mostly no documentation from manufacturers
● just a library, several front-ends
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libgphoto2 architecture
This can be➔gtkam➔gphoto2➔f-spot➔gthumb
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Which Cameras ?● Those that use proprietary protocols
– Canon– cheap cameras– old Nikon, Fuji, Olympus, Panasonic, Sanyo
● Those that use standard PTP– Canon (newer)– Kodak
● Those that you want to control– unsure which: You Mileage May Vary
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How to help ?
● Provide cameras to developers● Badger your camera manufacturer by
requesting him Open Source support for the camera– Canon only support MacOS and Windows in
their proprietary SDK– Nikon require a NDA to access SDK– PTP standard now require to pay USD$2500 as
a I3A membership fee
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How to help ? (cont.)
● Report bugs and provide debug information to gphoto developers
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Frontends
● gtkam– the gphoto project
GUI– only for that use
● gThumb● F-Spot
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Part 2
Archiving
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Archiving
● First thing I do because I'm paranoiac
● Thought for the lifetime
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How do I archive
● 1 folder per day: 20050528● Original camera files● Burnt directly on a CD-R with Nautilus● CD has a volume label with the date I create
the CD and sequence: pcd2005052801 ● Each CD has a burning date on the CD● Good quality CD● Stored in a sleeve inside a metallic box
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Part 3
Viewing and sorting
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Viewing and sorting
● What are Metadatas● Which tools ?
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Metadatas● EXIF
– Shooting data– Technical data– MakerNotes (proprietary)
● IPTC– Standard tagging for medias– No app that supports it
● but libiptcdata exists● ...and a patch for gThumb to use it● f-spot will eventually use it too
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“MakerNotes”
● Proprietary information inside EXIF data● Specific to a manufacturer and even to a
specific model● Found in RAW files● Contain data like lens type, camera program
mode, etc.● Decoded by most EXIF utilities, including
libexif, ExifTools (Perl)
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Viewing & sorting tools
● EOG– image viewer
● Nautilus– file manager
● gThumb– image browser
● F-Spot– photos collection manager
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Eye Of Gnome
● GNOME standard image viewer● Support EXIF● Just a viewer
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EOG: Screenshot
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Nautilus
● Browsing files● With Thumbnails● Require and external application to view:
EOG by default
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Nautilus: Screenshot
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gThumb
● Thumbnailing● Viewing● EXIF support● Slideshows● Import from camera● Commenting● Albums
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gThumb: screenshot
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f-Spot
● Inspired by iPhoto● Sorting● Tagging● EXIF support
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f-Spot: Screenshot
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gThumb vs. f-spot
● Folder based● Catalog● Slower● Written in C: easier
to install● A lot more editing
tools
● Time based● Tagging● Faster● Written in C# and
use Mono unstable● Red-eye removal
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My preference?
● f-spot because– subjective speed– tagging
● What I miss– hierarchical tagging– IPTC support– MakerNotes decoding– grouping by folder or album (see DigiKam for
KDE or Apple iPhoto)
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Part 4
Decoding
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Decoding pictures
● JPEG, no problem● RAW files: the
headache● Metadatas: EXIF
MakerNotes
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JPEG
● JPEG is an open format
● Works everywhere● No issues but quality
loss
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RAW files
● Proprietary– Specific to a camera– No documentation
● The best for quality and post processing
● Not usable directly
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RAW Files
● dcraw● gimp-dcraw● UFRaw● Bibble Pro
(proprietary)
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dcraw
● Command line● The “reference”
used by everyone– Adobe (decoding)– iPhoto
● Only outpus 8-bits and 16-bits linear PPM and 16-bits PSD (Photoshop) !
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dcraw
Examples
Output 16-bits linear per channel PPM:$ dcraw img_0123.cr2 img_0123.ppm
Output 8-bits per channel JPEG file:$ dcraw -c imp_0123.cr2 | cjpeg img_0123.jpg
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dcraw problems
● no meta data● no color management● not user friendly● hard to use by other programs: they end up
copying the code and not being up to date
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gimp-dcraw
● simple gimp plugin for dcraw conversion● still no meta data● still no color management
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UFRaw
● much better UI● color management with Little CMS● still no meta-data● standalone and GIMP plugin
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Bibble Pro
● Proprietary Software for MacOS and Windows
● Also works on Linux i386● Use dcraw● Implements CMS● Cost money but demo available
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OpenRAW
● Photographers realized the importance of open file format
● Triggered by Nikon white balance “encryption” affair
● Open Source will benefit from it
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Why do we need ?● Reverse engineering takes a lot of time● Results are not optimum● Perenity of our pictures
– there is no warranty they will support this format in 70 years with their proprietary software
– there is no warranty that we can run today software in 70 years
– we still can view pictures that are over 100 years old
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Why don't manufacturer want ?● Supposedly to protect their I.P. and camera
design from competition– but since it has been reverse engineered, there
is no point● Because they don't have an open culture● Because they want to control the market
– Nikon even denied Adobe access to the file format as Nikon RAW decoding software cost additionnal money
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Act Now!
● Request documentation to manufacturers
● http://www.openraw.org/actnow/
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Part 5
Editing
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Editing
● gimp
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The Gimp
● Quite Complete and extensive photo editing
● Drawbacks– no CMS (currently in
the work)– no 16-bits channels
(require for optimum RAW processing)
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Conclusion
● Solid foundation● Great hackers● Good apps● But still lot of work to do
– better file format support– better plug and play– better device support