Section: (pj)
Updated: 2021-10-19
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Handy utilities, scripts, or other things I need to remember.  


cam2web [files....] Convert big camera images to small web images. This is a bash function defined in ~/lib/

rotate [-o] [files...|-] Losslessly rotate an image clockwise 90 degrees. This is another bash function defined in ~/lib/

gphoto2: A CLUI app for using a digital camera. Some good options:

gphoto2 --list-ports
gphoto2 --auto-detect
gphoto2 --summary
gphoto2 --list-files
gphoto2 --get-all-files
gphoto2 --delete-all-files

xnview -browser: A very fast, nice GUI for navigating files. Renaming is easy. You can't rotate in browse mode, which is a little annoying. Makes nice web thumbnails, along with an html page.
flphoto: A okay GUI to grab and adjust images. Sadly there is no easy way to rename the image files, and it doesn't have color editing.
gtkam: A GUI that just downloads images. Not too useful. I couldn't get this to compile with EXIF support, unlike libgphoto2 and gphoto2, because libexif-gtk has issues.
convert in -modulate 100,110,100 out: This adjusts brightness, saturation, and hue. Here we're booting saturation 10%.
convert in -resize 200x200 out: This is a good size for web images.
convert in -resize 400x400 out: This is a good size for on-screen viewing.
jpegtran -rotate 90 -trim in >out: Losslessly rotates, except -trim will shave off a pixel or two along the edge. But that is better than leaving it there!


kernel 2.4.18 segfaults libgphoto2, so you might want to upgrade.

Your camera must be set up in /etc/hotplug/usb.usermap. You can run /usr/local/lib/libgphoto2/print-usb-usermap to fill that file. If your camera is missing, you won't gain ownership to the USB device when the camera is plugged in. Ownership is granted by /etc/hotplug/usb/usbcam. libphoto2 comes with various implementations for that script; the best seems to be granting ownership to the console owner.  


jpegtran(1), convert(1), ImageMagick(1).  


Paul A. Jungwirth.




This document was created by man2html, using the manual pages.
Time: 16:45:10 GMT, April 11, 2022