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Questions tagged [rendertargetbitmap]

The RenderTargetBitmap class, part of the .NET Framework (from version 3.0), converts a System.Windows.Media.Visual object into a bitmap.

The RenderTargetBitmap class (System.Windows.Media.Imaging.RenderTargetBitmap) converts a Visual (System.Windows.Media.Visual) object into a bitmap.

It can be used for example to render text as an image.

Support of RenderTargetBitmap was added to version 3.0 of the .NET Framework.

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Black image when rendering Viewport3D with RenderTargetBitmap in code behind

I have a viewport3D that rotate an image. I have to construct it in code behind. If I put my viewport in a grid everything works fine. But if I try to render it using a RenderTargetBitmap some problem arise and I get always an empty image. This is…
diolo
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Saving canvas data to image file output is wrong

I want to place an image over a parent image and save the final image. So I used parent image inside Canvas and added the child image in the canvas. Problems: Right after when i loaded the thumbnail(child) image, if i click on the parent image,…
linguini
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Rendering a UserControl in code rather than XAML

I want to use RenderTargetBitmap to render a UserControl to a bitmap without having to write the XAML for it. When I do this I get a blank image, am I missing a crucial step? ValTool.Controls.VideoFisheyeOverlayControl vfoc = new…
Chris
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Why does continual removing and re-adding of a DrawingVisual cause a constant increase in memory usage?

I've got a WPF program that uses a Canvas within a Window, over-ridden to become a Graphics_Canvas, which looks like this: class Graphics_Canvas : Canvas { private List visuals = new List(); protected override…
Greg
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Multiple thread image compositing

I'm using WPF imaging to composite text, 3d graphics and images together using a DrawingVisual. The result is then rendered into a RenderTargetBitmap and saved to disk as a jpeg. All of this happens in code with no visual window. It's working well…
roufamatic
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RenderTargetBitmap does not respect ColumnDefinitions width

I need to create snapshot of Grid with some hidden columns (by setting it's ColumnDefinition.Width = 0). On screen it looks fine, but the created image has all columns visible (does not respect the ColumnDefinitions). I red somewhere that it is…
karel
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WPF Saving image from Canvas using RenderTargetBitmap

I have a Canvas element that is located on a Grid. As long as the Canvas is located in the upper left corner of the grid, my code works fine, but if I move the Canvas anywhere else, it stores a blank image. private void…
RNovey
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JpegBitmapEncoder / RenderTargetBitmap - excessive sharpening since .net 2 vs 4.7.2

I've been working on migrating legacy ASP.Net/C# system to Azure. Initially just changing the minimal amount possible, but part of that is moving to updated .Net framework (2/3/3.5 => 4.7+) Part of this is a tool which creates image previews in…
Daf
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Cancel long running render operation in WPF

Is there any way to cancel a possibly long running render operation in WPF? In my case, I want to render a complex control (in a non-UI-thread) to a bitmap. var bitmap = new RenderTargetBitmap((int)RenderSize.Width, (int)RenderSize.Height, 96, 96,…
LionAM
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How to capture the rotated image to stream?

I am using the UWP image control. I have rotated the image to 45 degrees by applying the Rotate transform(Angle = 45) now I want to convert the rendered rotated image to stream. So I have tried the RenderTargetBitmap to capture the image but it is…
Santhiya
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Issues with MediaPlayer and RenderTargetBitmap getting a frame image from video

I'm trying to use MediaPlayerto get a frame from video as an image. MediaPlayer _mediaPlayer = new MediaPlayer(); _mediaPlayer.ScrubbingEnabled = true; _mediaPlayer.Open(new Uri("c:\\Sample.mp4")); _mediaPlayer.Position = new TimeSpan(0, 1, 0); var…
stef
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UWP The specified buffer index is not within the buffer capacity

I got this exception when I am trying to do this: var pixels = await bitmap.GetPixelsAsync(); byte[] bytes = pixels.ToArray(); It occurs at pixels.ToArray(). The information here doesn't help me too much. I only know that the length…
Seaky Lone
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Saving the render target bitmap results in wrong size when background is set

I am saving the rendered image using render target bitmap, and it is saved properly in the given size, but when I set background to the grid in which image is placed, I am getting different output. Can any one explain this behavior?
yogapriya shanmugam
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Why the use of 'RenderTargetBitmap' class makes GDI handle count increase?

My understandings 1) The classes inside 'System.Windows.Media' uses directx for rendering. It will not use GDI+. 2) Only classes in 'System.Drawing' uses GDI+ for drawing.( This can cause GDI handle count increase.) Issue But when I use…
Sunil
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WPF more efficient Render() Visual/Control to a bitmap

Is there more efficient way to render a visual to a bitmap? I am trying to use shader effects on UI elements and then I want to modify the result in code pixel-by-pixel. Now I use something like this: Button btn = new Button(); …
szpada87
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