bitmap

WPF – converting Bitmap to ImageSource

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For others, this works: //If you get ‘dllimport unknown’-, then add ‘using System.Runtime.InteropServices;’ [DllImport(“gdi32.dll”, EntryPoint = “DeleteObject”)] [return: MarshalAs(UnmanagedType.Bool)] public static extern bool DeleteObject([In] IntPtr hObject); public ImageSource ImageSourceFromBitmap(Bitmap bmp) { var handle = bmp.GetHbitmap(); try { return Imaging.CreateBitmapSourceFromHBitmap(handle, IntPtr.Zero, Int32Rect.Empty, BitmapSizeOptions.FromEmptyOptions()); } finally { DeleteObject(handle); } }

C# rotate bitmap 90 degrees

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What about this: private void RotateAndSaveImage(String input, String output) { //create an object that we can use to examine an image file using (Image img = Image.FromFile(input)) { //rotate the picture by 90 degrees and re-save the picture as a Jpeg img.RotateFlip(RotateFlipType.Rotate90FlipNone); img.Save(output, System.Drawing.Imaging.ImageFormat.Jpeg); } }

Image Orientation – Android

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You need to account for all orientations not just 90 or 180. I am using this File curFile = new File(“path-to-file”); // … This is an image file from my device. Bitmap rotatedBitmap; try { ExifInterface exif = new ExifInterface(curFile.getPath()); int rotation = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_NORMAL); int rotationInDegrees = exifToDegrees(rotation); Matrix matrix = new Matrix(); if … Read more

Captured Photo orientation is changing in android

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I had the same problem mostly with the Samsung handsets.Apparently Samsung phones set the EXIF orientation tag, rather than rotating individual pixels.Reading the Bitmap using BitmapFactory does not support this tag.What i found the solution to this problem was using ExifInterface in onActivityResult method of the activity.Which checks for orientation associated with URI of the … Read more

how to fill color in image in particular area?

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I found the Solution with Flood fill algoritham private void FloodFill(Bitmap bmp, Point pt, int targetColor, int replacementColor){ Queue<Point> q = new LinkedList<Point>(); q.add(pt); while (q.size() > 0) { Point n = q.poll(); if (bmp.getPixel(n.x, n.y) != targetColor) continue; Point w = n, e = new Point(n.x + 1, n.y); while ((w.x > 0) && … Read more

Getting a DrawingContext for a wpf WriteableBitmap

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I found sixlettervariables’ solution the most workable one. However, there’s a “drawingContext.Close()” missing. According to MSDN, “A DrawingContext must be closed before its content can be rendered”. The result is the following utility function: public static BitmapSource CreateBitmap( int width, int height, double dpi, Action<DrawingContext> render) { DrawingVisual drawingVisual = new DrawingVisual(); using (DrawingContext drawingContext … Read more

Cannot find Bitmap Class in Class Library (.NET Standard)

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I’m the author of CoreCompat.System.Drawing. If you’re on .NET Core 2.0, I’d recommend you’d move to System.Drawing.Common instead, which is the Microsoft-maintained implementation of System.Drawing for .NET Core. If you’re on Linux or macOS, make sure to install libgdiplus. On macOS, run brew install mono-libgdiplus; on Linux your package manager should provide you with a … Read more

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