Getting pics off the Canon camera
jimc, 2012-07-23

Nomenclature: Canon PowerShot SD4000 IS "Digital Elph"
El guia de inicio referenza "IXUS 300 HS", yo no comprende.  

Open the east cover.  Connect mini-USB cable from camera to host.

Turn on camera power.

Host recognizes USB device, but not mass storage.

This camera almost certainly uses PTP "Picture Transfer Protocol" and is in
the "Still Image" USB device class.  Use gphoto and/or gphotofs to work with
the storage.  

Obtain gphoto and gphotofs and cdk (dependency) from SuSE Build Service.

/usr/bin/gphoto2 is the executable program.  
    .	Connect the camera to USB
    .	Turn on camera power.
    .	Execute gphoto2 (it gives a usage message)
	.   --list-ports 
	    usb:001,003		Integrated webcam
	    usb:002,005		lsusb doesn't report, this is the Canon cam
	    usb:003,041		Bluetooth interface
	.   --auto-detect	Reports usb:002,005
	.   --abilities		
	    .	Can capture (?)
	    .	Can configure
	    .	Can delete individual files
	    .	Will not delete all files
	    .	File previews (thumbnails) available
	    .	Can upload
	.   --list-files
	    Files as seen by gphoto are in /store_00010001/DCIM/${dirno}_%m%d
		Example: 102_0515 where dirno increments each day that pics
		are taken and %m%d are 2 digits each, 0 padded.
		The files themselves are called IMG_${serno}.JPG where the
		serno is 4 digits 0 padded and increments continuously.
	.   --get-file ${range} (using sequence numbers from --list-files)
	    Not --get-files, the word is singular.  $range is a comma separated
	    list of units which are 1 number or a hyphen-separated pair, e.g. 
	    7-13.  If you repeat a frame it's suppressed, e.g. 1-5,3 means
	    1,2,4,5.  Downloading goes pretty fast.  The mtime of the 
	    downloaded file is the exact time when the pic was taken (according
	    to the camera's clock).  Sizes range from 2.1Mb to 4.6Mb.  
	.   --delete-file ${range}
	.   Turn off the camera and disconnect.

As configured, the images are 3648x2736 px, 24 bit color.  
The memory card is 16Gb, so can hold 4800 images (assuming 3.3Mb each). 
One DVD can hold 1400 images, for archival purposes.  

How to determine the filename of the pic you just shot:
    .	Turn on camera
    .	Set it for detailed picture info
	.   Put in picture taking mode (vs. review mode).
	.   Hit menu
	.   Tab: picture of camera (vs. hammer)
	.   Scroll down to Review Info, select Detailed.
    .	Get into review mode -- upper right corner, right pointing triangle
    .	Navigate to picture -- depress left-right edge of ring or rotate ring
    .	Info on pic, top to bottom of right edge:
	.   Battery + filename, gives daily folder number and serial number,
	    e.g. 103-0029 (day 103, serno 0029).
	.   Sequence number / number of pics on card, e.g. 24/159 = 24th pic
	.   Date and time, %y/%m/%d %H:%M (2 digit year)
    .	The same info should appear just after you shoot a new picture.
	You can control how long the post-shoot review info stays on, in
	the Review item just above Review Info.