C # using GDI to change the image size

Private void Create_Validate_Image ()
{

System. Drawing. Bitmap validate_image = new System. Drawing. Bitmap (width, height );

System. Drawing. Image image11 = System. Drawing. Image. FromFile (System. Web. HttpContext. Current. Request. MapPath ("42.jpg "));

Var image112 = image11.GetThumbnailImage (image11.Width/2, image11.Height/2, () =>{ return false ;}, IntPtr. Zero );

Graphics g = Graphics. FromImage (validate_image );

G. Clear (Color. White );
G. DrawImage (image112, 0, 0 );

 

System. IO. MemoryStream MS = new System. IO. MemoryStream ();

Validate_image.Save (MS, ImageFormat. Gif );
Response. ClearContent ();
Response. ContentType = "image/GIF ";

Response. BinaryWrite (ms. ToArray ());

G. Dispose ();
Validate_image.Dispose ();

}

// Flip

ImgPng. RotateFlip (RotateFlipType. Rotate180FlipX );

Intercept
 
Rectangle
Rect = new

Rectangle (0, 0, imgPng. Width/2, imgPng. Height );

Bitmap
ClipPng = new

Bitmap (imgPng). Clone (rect, imgPng. PixelFormat );

 

 

From Bychentufeiyang's column