system.drawing

问题 I need to convert 24- and 32-bits jpeg and png-files to a lower bit depth (16). I found some code to do this, but the resulting images keep the bit depth of the original file although there file size is lower. Image img = Image.FromFile(filePathOriginal); Bitmap bmp = ConvertTo16bpp(img); EncoderParameters parameters = new EncoderParameters(); parameters.Param[0] = new EncoderParameter(Encoder.ColorDepth, 16); bmp.Save(filePathNew, jpgCodec, parameters); bmp.Dispose(); img.Dispose(); ...

问题 I use C# and asp.net 4. How to convert and Hexadecimal Color in an equivalent RGB Color ? Example: FF0000 to 255,0,0. My aim is to pass this color to the method FromArgb namespace System.Drawing FromArgb Method (Int32, Int32, Int32) (Alpha is implicit as opaque) At the moment I use this code to Clear and Image and apply a opaque flat color: System.Drawing.Graphics.Clear(System.Drawing.Color.Red)); This works fine with predefined color like "Red", "Black" and so on, but not obviously with a

问题 Program.cs(1,14): error CS0234: The type or namespace name 'Drawing' does not exist in the namespace 'System' (are you missing an assembly reference? Is it possible to fix that? or I am not meant to be using this lib, if I am developing in Linux with C#? 回答1: The System.Drawing namespace is at the moment not part of corefx as it relies on the GDI+ features from Windows. But there are plans to support it in the future. But there are multiple alternatives: CoreCompat.System.Drawing CoreCompat

问题 Update: I would like to answer my own question with code that helped me solve the issue. It was submitted by Bradley but tweaked to work for me and may help others as well. But I can't answer until it is reopened. The linked duplicate provides a method, but no code. A code based answer to this question would be helpful to the community I'm having some slight issues with the formatting of the text drawn on an image inside of my console application. The text I'm trying to draw is: BAS2016=PTR

问题 I'm new to C# and .net, just trying to work out how to do something that I thought would be relatively simple. I'm creating a bitmap to be later saved as an image to disk, part of it I want to draw a rectangle shape. I can do this, however I'm looking for a simple way to do this on an angle. I need to be able to specify an angle to draw the rectangle at, I also need to be able to to specify the rotation point (I need to rotate around the top left hand point of the rectangle). How is this

问题 I need to load an image with green circle over a transparent background into a bitmap image using c# (System.Drawings). That's the easy part. However I need to change the color of the circle before adding it to the bigger image, without affecting the transparency of the surrounding. In my case I need to change the circle color to yellow and add it as a sun. I can't use fixed yellow circle image because the desired color is dynamic. So in the code below, how can I change the color of the image

问题 I want to know what the intermediate state of the buffer where the Graphics object is drawing some stuff. How do I get hold of the bitmap or the image that it is drawing on? 回答1: I'm not really sure if I understand what you're asking for, as your question is very unclear. If you want to know how to save the contents of a Graphics object to a bitmap, then the answer is that there's no direct approach for doing so. Drawing on a Graphics object is a one-way operation. The better option is to

问题 I understand it is best practise to call Dispose() on instances of Pen and Brush, except if they've been set to the system-predefined values (eg. System.Drawing.Brushes, System.Drawing.Pens or System.Drawing.SystemBrushes) Trying to dispose a system-defined resource results in an exception being thrown. It doesn't appear to be obvious how you can detect (apart from wrapping the Dispose() call in a try/catch) whether one of these resources is referencing a system-defined or user-defined value.

问题 I have a custom picturebox control that allows dragging 2 bitmaps separately on the Main image,thus allowing the user to select the location of the 2 bitmaps. For First Bitmap Point src = e.Location; PointF ratio = new PointF((float)src.X / ClientSize.Width, (float)src.Y / ClientSize.Height); LaunchOrigin.textratio = ratio; Point origin = new Point((int)(backupbit1.Width * ratio.X), (int)(backupbit1.Height * ratio.Y)); LaunchOrigin.textorigin = origin; point.X = src.X - origin.X; point.Y =

问题 I am trying for some time now to add System.Drawing to the references in Visual Studio 2015. Nothing seems to work. When I go into the add reference pane, there is no System.Drawing in the list. I need the Bitmap class from System.Drawing not one from Android.Graphics 回答1: As @Cheesebaron quoted once if forum : If you look at http://docs.xamarin.com/guides/android/advanced_topics/assemblies you will see that System.Drawing is not a part of the Assemblies shipped with Xamarin.Android, the same