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Reading Images Direct from Camera

Apr 16, 2012, 14:23
Post: #1
Reading Images Direct from Camera
I have both GIMP and Digikam on my ArchLinux system.

I have set up the system so that it auto-mounts my camera when I plug it into a USB port, and I can read the images on its card using Digikam.

So far I have not been able to do this using Gimp - extensive searching using Google suggests that it should be possible File/Open/.. or File/Acquire..

Extensive searching on this forum has not helped!

Thank-you for any help you can offer.
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Apr 16, 2012, 17:25
Post: #2
RE: Reading Images Direct from Camera
Cameras can be connected in two USB modes: as an imaging device (PTP: Picture Transfer Protocol), or as a mass-storage device. Digikam supports both. But Gimp only knows about files and urls, so the camera has to be used in mass-storage mode (AFAIK, even on Linux where everything looks like files, there is no drivers for the PTP device that makes it look like a filesystem). Getting either mode is camera-brand dependent. On the ones I have used, the Lumix use PTP if the mode dial in on "Printer" and mass-storage for the rest. Canon cameras only do PTP. Futhermore in some countries cameras are limited to PTP to not fall under some tax regimen for mass-storage devices. For this same reason some won't even delete images in the camera from the PC.

Reading the pictures card is much faster using a card reader. Most laptops come with an integrated one, otherwise USB card readers are dirt cheap. And of course the card appears as a mass storage device in this case.

Editing the image with Gimp directly off the card is risky... If you can make the camera work in tethered mode in Digikam, then all files are immediately transfered to the PC, and you can have Gimp load them from the receiving directory.

As much as I love Gimp, I won't let it have the first shot at a picture I make. Its 8-bit/channel capacity causes round-off errors that show up very quickly during global image processing (color balance/contrast/brightness). Digikam is better suited for this for the time being. Gimp is best for the final touches.

Now answering your questions on
https://Gimp-Forum.net
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Apr 16, 2012, 17:42
Post: #3
RE: Reading Images Direct from Camera
(Apr 16, 2012 17:25)ofnuts Wrote:  Cameras can be connected in two USB modes: as an imaging device (PTP: Picture Transfer Protocol), or as a mass-storage device. Digikam supports both. But Gimp only knows about files and urls, so the camera has to be used in mass-storage mode (AFAIK, even on Linux where everything looks like files, there is no drivers for the PTP device that makes it look like a filesystem). Getting either mode is camera-brand dependent. On the ones I have used, the Lumix use PTP if the mode dial in on "Printer" and mass-storage for the rest. Canon cameras only do PTP. Futhermore in some countries cameras are limited to PTP to not fall under some tax regimen for mass-storage devices. For this same reason some won't even delete images in the camera from the PC.

Reading the pictures card is much faster using a card reader. Most laptops come with an integrated one, otherwise USB card readers are dirt cheap. And of course the card appears as a mass storage device in this case.

Editing the image with Gimp directly off the card is risky... If you can make the camera work in tethered mode in Digikam, then all files are immediately transfered to the PC, and you can have Gimp load them from the receiving directory.

As much as I love Gimp, I won't let it have the first shot at a picture I make. Its 8-bit/channel capacity causes round-off errors that show up very quickly during global image processing (color balance/contrast/brightness). Digikam is better suited for this for the time being. Gimp is best for the final touches.

Thank-you, of nuts, for your very comprehensive reply and advice - it is much appreciated.
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Apr 18, 2012, 22:14
Post: #4
RE: Reading Images Direct from Camera
i right click on the image in my file browser [or in ristretto] and choose "open with gimp"
i use debian + xfce, arch is terrifying! Big Grin
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