This is the most efficient: It grabs a pixel at the location of the cursor, and doesn’t rely on only having one monitor. using System; using System.Drawing; using System.Drawing.Imaging; using System.Runtime.InteropServices; using System.Windows.Forms; using System.Diagnostics; namespace FormTest { public partial class Form1 : Form { [DllImport(“user32.dll”)] static extern bool GetCursorPos(ref Point lpPoint); [DllImport(“gdi32.dll”, CharSet = … Read more
Like this? public static void Test() { using (var image = Image.FromFile(@”c:\logo.png”)) using (var newImage = ScaleImage(image, 300, 400)) { newImage.Save(@”c:\test.png”, ImageFormat.Png); } } public static Image ScaleImage(Image image, int maxWidth, int maxHeight) { var ratioX = (double)maxWidth / image.Width; var ratioY = (double)maxHeight / image.Height; var ratio = Math.Min(ratioX, ratioY); var newWidth = (int)(image.Width … Read more
The immediately usable code public class DirectBitmap : IDisposable { public Bitmap Bitmap { get; private set; } public Int32[] Bits { get; private set; } public bool Disposed { get; private set; } public int Height { get; private set; } public int Width { get; private set; } protected GCHandle BitsHandle { get; … Read more
As it’s a MemoryStream, you really don’t need to close the stream – nothing bad will happen if you don’t, although obviously it’s good practice to dispose anything that’s disposable anyway. (See this question for more on this.) However, you should be disposing the Bitmap – and that will close the stream for you. Basically … Read more
This is a Custom Control derived from Control, which can be made translucent. The interface is a colored circle which can contain a couple of numbers. The Control exposes these custom properties: Opacity: The level of opacity of the control BackGround [0, 255] InnerPadding: The distance between the inner rectangle, which defines the circle bounds … Read more
OK I seem to have found the cause just by sheer luck and its nothing wrong with that particular method, it’s further back up the call stack. Earlier I resize the image and as part of that method I return the resized object as follows. I have inserted two calls to the above method and … Read more