February 11, 2014

Finding a Photo’s Location

Photos Have Embedded Geographical Information

Today many photo taking devices have GPS and other location determining technologies built in. As a result photos from these devices typically have the geographic location the image was taken embeded into them.

While some image viewing tools will allow you to see the geographic meta data many more programs do not. To overcome this on an Apple computer in OSX we can use a command called mdls. MDLS allows you to view a document’s meta data. In our case we are going to look at a jpeg image.

How To Find A Photos Location

  1. Find the path to the image you would like to see the geo information of.
    • Example: /Users/MyUserName/Desktop/MyImageName.jpg.
    • Using OSX’s Finder application is a good way to find the file’s path
  2. In OSX, open the application Terminal.
  3. In the Terminal window type: mdls /path/to/you/image/MyImageName.jpg and hit Enter.
    • Example: mdls /Users/Nate/Desktop/FunnyPicture.jpg
  4. In the listed of meta data that appears you should see fields for Longitude and Latittude. In my example file the fields are called kMDItemLatitude and kMDItemLongitude.
    MDLS Command
  5. Ta da! You now know where this image was taken

Seeing Image Location On A Map

If you would like to see the location of the image on a map, head over to https://support.google.com/maps/answer/18539?hl=en to format the longitude and latitude coordinates for searching on maps.google.com

~Nathan

January 15, 2013

TTL, ETTL & ETTL 2 Flash Metering Explained

I stumbled onto a great layman’s term explanation of how TTL, ETTL, and ETTL 2 Flash metering works. The narrator uses an analogy of water in a glass & pitcher to explain how the lens/camera meters light being output by the flash.

Overview of Flash Metering

  • TTL = Through-the-lens metering. The camera outputs light through the flash until it detects enough has been provided.
  • ETTL = Evaluative-through-the-lens metering. The camera outputs a pre-flash to determine how much light is needed prior to exposure. This is done in a fraction of a second so you never see it happen. Then the camera flashes for the exposure with necessary adjustments made based on the pre-flash.
  • ETTL 2 = Similar to ETTL, but with enhanced light calculations including the ability to ignore small reflective surfaces and the ability to use distance information from the Len’s focus ring.
~Nathan

January 1, 2013

Near 365 Day Photo Project

Snowy Bench

I am kicking of a 365-day photo project. Rules of the game are simple: 1 photo a day. Photos will be posted on my Near 365 Photo Project page. Why a “near” 365-day project? Because quite simply life is busy and sometimes things have to be de-prioritized. Think of it as realistic goal setting.

~Nathan