Home
IPhone SMS To Gmail
Consulting
Blog
Software
Projects
Links
About
Contact
 Blog
 Facebook
 Twitter
 LinkedIn
|
<< Back To All Blogs
Creating High Quality Images with C# and GDI
Thursday, August 13th, 2009
I have posted in the past about creating organizational charts using C# and GDI, but I have recently come across a scenario in which I needed to make the charts show up as 100% quality (they were blurred because of the default, lower-quality GDI output).
Low and behold GDI does indeed support the ability to change output quality to a Bitmap, and while it isn't the easiest thing to figure out originally, it really isn't that bad.
So I figure the best way is to jump right into the code, so here we go. All of these classes are available in the System.Drawing.Imaging namespace of .NET:
// Encoder parameters can hold multiple parameters to pass to the Save method for the Bitmap class
EncoderParameters encoderParams = new EncoderParameters();
// Requires an array for the quality parameter
long[] quality = new long[1];
// 100 is 100%, 0 is 0%
quality[0] = 100;
// Create a new encoder parameter with the specified quality array from above
EncoderParameter qualityParam = new EncoderParameter(Encoder.Quality, quality);
// Add this parameter to the entire collection
encoderParams.Param[0] = qualityParam;
// This could either be a newly-created Bitmap, or come from a loaded image, etc
Bitmap result = GetBitmapOutput();
// We can no longer pass the normal ImageFormat Enum to the Save method, so we need to find the actual encoder from C#/GDI
ImageCodecInfo[] ici = ImageCodecInfo.GetImageEncoders();
ImageCodecInfo encoder = null;
// Loop through them all and set the encoder if we find it to be on JPEG, this could also be used for PNG, GIF, etc
for (int a = 0; a < ici.Length; a++)
{
if (ici[a].FormatDescription.Equals("JPEG"))
{
encoder = ici[a];
}
}
// Save the Bitmap to the output stream (in my case), with the specified encoder and encoder parameters
result.Save(Response.OutputStream, encoder, encoderParams);
// Clean up
result.Dispose();
Not too bad, hopefully that will help some of you along the way.
Imagin' Tom Out.
Tags
CSharp
Howto
Related Blogs
Querying Table Entities with Microsoft Azure (And ADO.NET Data Services Framework)
Validate a Windows Username and Password against Active Directory
Programatically Retrieving an Assembly's PublicKeyToken through a PowerShell CmdLet
Comparing XML files in C# Using Microsoft's Diff and Patch Tool
Reading A Database Schema in SQLite with C#
Comments
Currently no comments.
Add A Comment
Name:
URL:
Email Address: (not public, used to send notifications on further comments)
Comments:
Please enter the text from the image:
|