system.drawing

I've got some code that takes a png that is a greyscale image with transparency and attempts to create a new image that has a given background colour (looked up from a database) and overlays the original image on it to create an image of the required colour with highlights and shading. The code is run in an ASP.NET context but I don't think that is relevant. The code works fine on my local computer but when it is deployed to our UAT server it gives unexpected results. On the UAT it creates an image of the right size but the shaded/highlighted area seems to have been shrunk in each dimension by

I would like to crop and resize my image. Here is my code: Image image = Image.FromFile(AppDomain.CurrentDomain.BaseDirectory + "Cropper/tests/castle.jpg"); // Crop and resize the image. Rectangle destination = new Rectangle(0, 0, 200, 120); Graphics graphic = Graphics.FromImage(image); graphic.DrawImage(image, destination, int.Parse(X1.Value), int.Parse(Y1.Value), int.Parse(Width.Value), int.Parse(Height.Value), GraphicsUnit.Pixel); Now I assume that my resulting cropped/resized image is stored in the graphics object. The question is - how do I save it to a file? The Graphics object that you

I'm trying to return a transparent GIF from an .aspx page for display within a web page. I am trying to get the image to have transparency, but I just keep getting Black being where the image should be Transparent. Does anyone know what I'm doing wrong? Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) _ Handles Me.Load '' Change the response headers to output a GIF image. Response.Clear() Response.ContentType = "image/gif" Dim width = 110 Dim height = width '' Create a new 32-bit bitmap image Dim b = New Bitmap(width, height) '' Create Grahpics object for drawing

This question already has an answer here: How to convert from System.Drawing.Color to System.Windows.Media.Color? 3 answers System.Drawing.Color drawRedColor = System.Drawing.Color.Red; System.Windows.Media.Color mediaColor = ?drawRedColor.ToMediaColor();? How about: using MColor = System.Windows.Media.Color; using DColor = System.Drawing.Color; ... public static MColor ToMediaColor(this DColor color) { return MColor.FromArgb(color.A, color.R, color.G, color.B); } EDIT: Fixed the 'unpacking' of the ARGB. System.Windows.Media.Color mediaColor = System.Windows.Media.Color.FromRgb(Color.Red.R,

The GDI+ generic error when saving a bitmap is obviously a common problem according to my research here on SO and the web. Given following simplified snippet: byte[] bytes = new byte[2048 * 2048 * 2]; for (int i = 0; i < bytes.Length; i++) { // set random or constant pixel data, whatever you want } Bitmap bmp = new Bitmap(2048, 2048, PixelFormat.Format16bppGrayScale); BitmapData bmpData = bmp.LockBits(new Rectangle(0, 0, 2048, 2048), ImageLockMode.ReadWrite, bmp.PixelFormat); System.Runtime.InteropServices.Marshal.Copy(bytes, 0, bmpData.Scan0, 8388608); bmp.UnlockBits(bmpData); bmp.Save(@"name

I'm trying to compress PDFs using iTextSharp. There are a lot of pages with color images stored as JPEGs (DCTDECODE)...so I'm converting them to black and white PNGs and replacing them in the document (the PNG is much smaller than a JPG for black and white format) I have the following methods: private static bool TryCompressPdfImages(PdfReader reader) { try { int n = reader.XrefSize; for (int i = 0; i < n; i++) { PdfObject obj = reader.GetPdfObject(i); if (obj == null || !obj.IsStream()) { continue; } var dict = (PdfDictionary)PdfReader.GetPdfObject(obj); var subType = (PdfName)PdfReader

I get Out of Memory exception when using System.Drawing.Graphics.FromImage (using latest versions of .NET software on Windows 2012 server), ONLY on a very few specific image files . Most of the time the code works fine. Typical answers to above issue indicate that certain resources are not being released. Please consider the following before answering:- This specific image is 34KB in size, is a .JPG image. Server is idle and has over 32GB RAM. If I look at properties of this jpg file, using windows explorer, by right-clicking on file, Windows says: 96 dpi and 32 bit depth . BUT, if I open this