Autarchy of the Private Cave

Tiny bits of bioinformatics, [web-]programming etc

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    Archive for May 2nd, 2007

    Digital photo cameras can capture infra-red light

    2nd May 2007

    This is quite a well-known thing among frequent and professional photographers, but still an interesting thing to know.
    I was also told that digital photo cameras can “see” in ultraviolet as well, but didn’t check if that’s true.
    As for infra-red light, this can be easily checked using any common “direct visibility” remote control. Most if not all use infra-red diodes to transmit signal. So I just pointed a remote at the camera, and made a shot. (Actually, camera real-time display also shows captured infra-red light, as it starts blinking in the remote.) Here is the proof of digital cameras ability to capture infra-red light. The bluish dot in the centre of the red-front-plastic-screen of the remote is infra-red light.


    Posted in Hardware, Misc | No Comments »

    mod_rewrite cheat sheet

    2nd May 2007

    There was an excellent mod_rewrite cheat sheet at ILoveJackDaniels, but it is now gone.

    I have been using it for over a year now, as from time to time there’s a need to try to remember how to use mod_rewrite (e.g. in the case of no-www Class B web-site).

    To help preserve this useful bit of information, and for the cases of the original article being unavailable (which did happen a few years later), below is a link to the cheat sheet stored on my server.
    Read the rest of this entry »


    Posted in Links, Notepad, Programming, Web | No Comments »