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David Anson wrote his own PNG encoder and shares with you the source code, a simple test application and the automated test suite.

Source: Delay's Blog

Okay, so what does a PNG (Portable Network Graphics) image encoder have to do with pseudo-localizing on the Silverlight platform? Almost nothing - except for the fact that I went above and beyond with my last post and showed how to pseudo-localize not just text, but images as well. It turns out the technique I used for that (reading the System.Drawing.Image instance from the resources class and manipulating its pixels before handing it off to the application) won't work on Silverlight.

Walt Ritscher has a short blog post discussing leaking memory with images in Windows Phone 7.

Source: WPF Wonderland

Conserving memory is a huge issue in Windows Phone 7 programming. You must be diligent in checking your memory footprint during development for obvious reasons. For one, your application is destined to run on a limited resource device. For another, Microsoft will refuse to certify your app if you exceed the memory limits.

Martin Krüger wanted to create something useful with the Silverlight GridSplitter control and ended up with this GridSplitter Picture Viewer. You can view the sample and download the source code at the Expression Gallery.

Source: Microsoft Expression Gallery

A simple solution for a picture viewer where the aperture is implemented using a GridSplitter control.

This is no UserControl or CustomControl. But the technique using a GridSplitter could be used for a User/CustomControl.

                                                     

In this post, Laurent Bugnion explains how to get a screenshot of a WP7 application's page.

Source: Laurent Bugnion's Blog

Often times, you want to take a screenshot of an application’s page. There can be multiple reasons. For instance, you can use this to provide an easy feedback method to beta testers. I find this super invaluable when working on integration of design in an app, and the user can take quick screenshots, attach them to an email and send them to me directly from the Windows Phone device. However, the same mechanism can also be used to provide screenshots are a feature of the app, for example if the user wants to save the current status of his application, etc.

Mike Ormond discusses resizing images in Silverlight on WP7.

Source: Mike Ormond's Blog

I’d assumed that WriteableBitmap has the facility and sure enough I came across a few useful pointers and articles (including this one on the Coding4Fun blog). In fact there are a couple of mechanisms for doing this with WriteableBitmap.

Jaime Rodriguez talks about some image tools/libraries that allow you to use GIF files in your WP7 app.

Source: The Blog of Jaime Rodriguez

As you know, Silverlight does not have native support for decoding gif images. That is downer, but not a showstopper since several 3rd party, opensource libraries for decoding Gifs.

The Twitter for Windows Phone team used the ImageTools project from Codeplex to decode gifs.   It worked well, but when we implemented there were two things that bothered me a little:

1. The decoder was not perfect.  In our experience, it does ~90% of the images we tested  [and that was thousands of images, so representative test]
2. There was one infinite loop that bothered me.  Has to do with nextflag during decoding. The Decoder checks for flags to be != 0, and for some odd reason we have seen gifs with nextFlag = –1; this can send your app into an infinite loop.  

Source: Mike Ormond's Blog

One of the things you might notice about the emulator – especially if you’re doing anything with imagery, is the lack of any pictures in your library. This can be a problem, particularly if you want to do any testing with the PhotoChooserTask but fear not, there is a way around it and yes, it uses XNA.

The idea is to check when your application starts whether it’s running in the emulator, and if it is, add some pictures so you have something to work with. You can do this using the Microsoft.Xna.Framework.Media.MediaLibrary class. This class has a SavePicture() method that allows you to save a JPEG image to the media library on the device.

Mike Taulty posted a video showing how Silverlight contributes to creating a nicer experience with Windows Live Photos.

I really like the subtle use of Silverlight on Windows Live Photos – it’s not one of those over-the-top spinning, projection based UI’s but it makes the experience for uploading photos and for viewing in a SlideShow just a lot nicer.

If you’ve not seen it, here’s a quick example;

Check out Phil Middlemiss' workaround for having tiled images as a background brush for your controls and styles when using Silverlight ImageBrush.

The Silverlight ImageBrush does not support the TileMode property that exists in WPF, and as a result there is no built in way to have tiled images as a background brush for your controls and styles.

The following control may be useful to you if you find yourself wanting to achieve the same things as a WPF tiled image brush.