Day: March 29, 2008

  • Back to Basics: The Subtler Differences Between Cameraphones and Digital Cameras

    Dash cameraphone vs. Canon A710IS

    Discussions (and sometimes rants) about camera phone photos usually steer towards pixel count, clarity, and color. However, there are subtler differences between camera phone photos and digital camera photos. Take the two photos above taken using a T-Mobile Dash cameraphone (left) and a Canon Powershot A710IS point-and-shoot digital camera. I’ve resized both photos from their respective 1.3 megapixel and 7 megapixel resolutions so that both images are 320 pixels wide.

    The first thing you probably noticed is that when resized to the same width the Dash’s photo is much squarer than the A710IS’. Cameras vary slightly in aspect ratio. So, if something seems slightly odd in your cameraphone photos, compare it to the aspect ratio of the digital camera you normally use. Cropping the camera phone photo to match the aspect ratio you are comfortable with might help.

    Although I did not take the two photos at the exact same angle, you can still see that the camera phone photo seems flatter than the digital camera’s. Seeing distinct people (mostly heads here) drops off rapidly after a row or two of tables in the food court. The digital camera has a slightly wider angle of view even though I took both photos from exactly the same spot.

    So, if something about your camera phone photo doesn’t seem quite right to you. It may not be the resolution or even the sharpness of the photo. It might be some of the subtler aspects of  camera phone’s imaging characteristics that might be at play for you.

  • OLPC XO Build 656 and WiFi WPA

    OLPC update

    I finally got around to playing with the OLPC XO in an effort to get it to work with WPA on a wireless LAN. It turns out that the build 656 update back in January added WPA support. The OLPC wiki has detailed instructions at…

    Olpc-update

    …but here’s the condensed version.

    • Open up terminal window (scroll right to see the icon in the menu)
    • su – (the OLPC does not have a root password)
    • olpc-update 656
    • shutdown -r now

    The olpc-update command has an option to reboot after a successful update. But. you might want to review the process outputs before rebooting. After rebooting, I selected the WPA enabled access point (I left the old 802.11b WAP in WEP encryption mode in case I couldn’t get WPA working with the OLPC) and typed in my passphrase. The WPA encrypted 801.11g WiFi connection seems to work fine with the OLPC now. Now, if only they would fix the external USB keyboard problem (shift key doesn’t wok).

    You can find OLPC WiFi Access Point compatibility information at…

    Wireless Access Point Compatibility