In this scenario you just need to call this task and show the re-sized image like this: smallImage.Source = await ResizedImage(file, 250, 250) Var newHeight = (int)(origHeight * ratio) Var ratioY = maxHeight / (float)origHeight Var ratioX = maxWidth / (float)origWidth IRandomAccessStream inputstream = await ImageFile.OpenReadAsync() īitmapImage sourceImage = new BitmapImage() If you just want to select a picture, show it and in the meanwhile show the re-sized picture of original one, you can pass the StorageFile as parameter like this: public static async Task ResizedImage(StorageFile ImageFile, int maxWidth, int maxHeight) There is no good method to directly copy a BitmapImage, but we can reuse StorageFile for several times. I may want to return a copy of the original BitmapImage rather than modifying the original. This way seems to work, but ideally rather than modifying the original BitmapImage, I would like to create a new/copy of it to modify and return instead. SourceImage.DecodePixelHeight = newHeight Var newWidth = (int) (origWidth * ratio) Var newHeight = (int) (origHeight * ratio) Var ratioY = maxHeight/(float) origHeight Var origHeight = sourceImage.PixelHeight

Here it is: public static BitmapImage ResizedImage(BitmapImage sourceImage, int maxWidth, int maxHeight) I have modified the code from the above mentioned link, and have a hack which works for my specific need.

Has anyone had any luck being able to resize (scale down) images in Windows 10? My application will be processing images from multiple sources, in different formats/sizes, and I am trying to resize the actual images to save space, rather than just letting the application size it to fit the Image in which it is being displayed. I have tried using the BitmapImage class from Windows.UI. instead, but it does not seem to offer the functionality that was found in System.Drawing. However, that project uses the System.Drawing libraries, which are not available to Windows 10 applications. I have used the code from to resize images programmatically.

How to resize images on windows 10