CFIMAGE Part 2

In my previous post CFIMAGE Part 1 we created a simple image and added some text to the image and wrote it out directly to the browser.

In this post we will look at the EXIF data of an image. Typically the EXIF or Exchangeable Image File Format gets written to an image mostly during the creation process of modern digital cameras and only with JPEG images. Some additional information may get written to the image during post processing in Photoshop or other imaging software.

When you upload an image to a service such a Flickr the EXIF data gets stored along and is made available to viewers of your image.

With the inclusion of this tag we now have access to the data ourselves and can likewise use the info in our own photo album applications for example.

It's relatively simple to use, you need to first read in your image using either the cfimage tag or the ImageNew function and then call the ImageGetExitMetadata function.

I'm using one of my favorite photos from our trip to the Tuscany region of Italy in 2006.

Produces a dump similar to the following:

The Image	The EXIF Data

Thats a lot of information packed into the JPEG file!

What I find great about the information, being an amateur photographer, is that you have easy access to things such as F-stop, ISO speed, Focal length, and the exact time you took the image. Most of the time I forget what the F-stop or exact Focal length at which I took the image. A sign of a real amateur no doubt!

You can also get just a single EXIF tag's information using the ImageGetExifTag function for example.

Would result in 85,0 mm being written out to the browser.

Happy Coding....