writeablebitmap

问题 Windows Phone 8 scales elements using the scale factor value so all pixels are virtual to 800x480 and values such as ActualWidth/ActualHeight return the "fake" 800x400 value. I'm displaying a WritableBitmap that is constructed dynamically on the background of my UI and would like it to be constructed of all available pixels not a scaled 800x480 image. How do I "disable" the scaling and map the virtual pixels to be real device pixels? I know how to calculate the value from the scale factor but

问题 So I'm using WriteableBitmapEx for an app on Windows RT. I'm trying to implement edge detection on an image using the sobel operator. I have successfully applied both kernels for x and y detection onto the image using .Convolute(), but now I'm stuck adding both images to one. The problem is, that all the pixels of both images seem to have the value 0 for transparency (so the A in ARGB). I can display both images on their own without a Problem, but adding them gives me just a black picture. So

问题 I was wondering how I could go about converting an ImageSource object (in my case the source property of an image element) to a WriteableBitmap . The WriteableBitmap(BitmapSource) constructor doesn't work in Windows 8 Metro, so I can't do that. I've tried to load the ImageSource object into a stream and then use WriteableBitmap.SetSource(stream) , but I can't figure out how do load the image in a stream either. InMemoryRandomAccessStream ras = new InMemoryRandomAccessStream(); BitmapEncoder

问题 I would like to do something like this http://weblogs.asp.net/broux/archive/2011/02/08/silverlight-how-to-watermark-a-writeablebitmapimage-with-a-text.aspx. I am having a tough time getting this to work in WinRT. I am using the WriteableBitmap extensions to "render" some text but I want it to look exactly like it looks in this example. Any suggestions or help? 回答1: You could render that text to a png asset and blit it on top of the bitmap. Unless the text needs to be dynamic - then you'd need

问题 I have created a WriteableBitmap in Gray16 format. I want to resize this WriteableBitmap to my known dimention preserving the pixel format(Gray16). Is any one worked on the Resizing the WriteableBitmap. Please help me. I also searched the internet and found http://writeablebitmapex.codeplex.com/ but this through an assebmly reference error. Please help me. 回答1: You can use the following function to resize a writableBitmap : WriteableBitmap resize_image(WriteableBitmap img, double scale) {

问题 In my code, I'm receiving WriteableBitmaps from a byte array (in turn from a Kinect) and I'd like to turn them into bitmaps for use with EmguCV. Currently this is the code I have: // Copy the pixel data from the image to a temporary array colorFrame.CopyPixelDataTo(this.colorPixels); // Write the pixel data into our bitmap this.colorBitmap.WritePixels( new Int32Rect(0, 0, this.colorBitmap.PixelWidth, this.colorBitmap.PixelHeight), this.colorPixels, this.colorBitmap.PixelWidth * colorFrame

问题 I'm looking at the colors basic sample from the Kinect developers toolkit using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.IO; using System.Threading.Tasks; using System.Windows; using System.Windows.Controls; using System.Windows.Data; using System.Windows.Documents; using System.Windows.Input; using System.Windows.Media; using System.Windows.Media.Imaging; using System.Windows.Navigation; using System.Windows.Shapes; using Microsoft.Kinect;

问题 I have an Esri map in silverlight and I am trying to get a screenshot. However, I am facing cross-domain content protection for writeablebitmap, saying "Pixels are not accessible". Is there a way that I can disable this? or any other work around in silverlight 3 or 4? 回答1: you can kind of hack around this by rehosting the image. basically you can set up a wcf service on your server that acts as a proxy to the map, then when silverlight does the security check on your media source it will see

问题 I'm currently having some problems in integrating a System.Drawing.Bitmap into a WPF WriteableBitmap . I want to copy from the Bitmap to position (X,Y) of the WriteableBitmap . The following code shows how I've tried to do this. BitmapData Data = Bitmap.LockBits(new Rectangle(0, 0, Bitmap.Width, Bitmap.Height), ImageLockMode.ReadOnly, System.Drawing.Imaging.PixelFormat.Format32bppArgb); WriteableBitmap.Lock(); //CopyMemory(WriteableBitmap.BackBuffer, Data.Scan0, ImageBufferSize); Int32Rect

问题 Some time ago i posted a question related to a WriteableBitmap memory leak, and though I received wonderful tips related to the problem, I still think there is a serious bug / (mistake made by me) / (Confusion) / (some other thing) here. So, here is my problem again: Suppose we have a WPF application with an Image and a button. The image's source is a really big bitmap (3600 * 4800 px), when it's shown at runtime the applicaton consumes ~90 MB. Now suppose i wish to instantiate a