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Blogs in the month of Nov 2009
8 Posts
When and how to use the right BitmapCacheOption setting
I keep stumbling across the consequences of changing which BitmapCacheOption I use. Despite the fact that metadata in a file isn’t really that big in the grand scheme of things, changing which caching option you use can have annoying consequences. The two typical issues I run into are: running of our memory when process lots of files or not having any data to work with. Let’s look at the code:  
How to Get Your 2008 TransRockies Photos
I took over 1000 photos at the 2008 TransRockies but it’s been over a year since the event, so I no longer have them online. If you are interesting in seeing photos of your team please contact me and I’ll upload them to the site for your viewing pleasure and purchase if you like them. Thanks.          
Reading Geotagging in Photos Using Windows Imaging Component
In this blog I’m going to explain how Geotagging metadata can be read and written using Windows Imaging Component. First lets look at all the queries. These are the common ones, there are plenty more but I have not found any immediate need to use them.  
Fotofly v0.1 available for Download on Codeplex
After several years of evolving my photo metadata code I’m finally ready to put it online. Being the nice corporate citizen that I am, I’m using CodePlex and you can find Fotofly here for download. My somewhat lofty description of the project is: “A comprehensive C# library for reading, manipulating and writing metadata stored in jpg photos using WPF and the Windows Imaging Component. Includes support for Windows Live Photo Gallery People Tags, GPS Coordinates and most EXIF, XMP & IPTC properties.” Hopefully I’ll get lots of downloads and feedback to help improve it further.    
Reading and Creating Exif Rationals
Quite why Jeida who created Exif decided to use Rationals is beyond me but they did so you have to work with them if you’re playing with jpg metadata. In this blog post I’ll share my Rational class so you don’t have to go through all the pain I went through in creating it. It’s amusingly short now I look at it here but it took way too long to work it out. The class has two constructors, one for the value you’ve retrieved from BitmapMetadata, the second when you’re creating your own rationals.  
Basic Editing of Photo Metadata Using Windows Imaging Component
In my previous posts I’ve provided examples on using Windows Imaging Component to Read & Write jpg metadata. In this post I’ll explain how to use ContainsQuery , GetQuery , SetQuery and RemoveQuery . As an added bonus I’m going to use the IPTC address fields as my example. Whilst BitmapMetadata does provide some standard properties like Subject and Title, it is far from comprehensive. In order to get at the other data you have to provide the right query.  
Writing Photo Metadata Using Windows Imaging Component
In this blog I’m going to build on my previous posting on Reading Metadata and explain how to write metadata stored in a jpg file using Windows Imaging Component . You can find all my blogs on Windows Imaging Component here . If you want to change any of the metadata, the first thing you have to do is make sure there’s room for your changes. This is done by adding padding to the metadata. If you don’t do this, I guess it’s possible to remove data or change it to the exact same size but you can’t add new data. The general recommendation appears to be around 5k, so I normally use 5120.  
Reading Photo Metadata Using Windows Imaging Component
I still see a lot of questions on the Internet and at work on how to read (& write) metadata in Photos. There are plenty of examples out there but they all appear to have some pitfalls. To be quite honest, the code I’ve been using for a number of years now is mature enough that it solves almost all the problems I’ve seen. This blog is the first in a series that document how to read (this blog), write and manipulate photo metadata.  

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