you can use load from stream
Image.FromStream
once you have the image use the code similar to resizing.
copying an old piece of code that i had posted a few weeks back I am
resizing a jpeg file. You should be alright loading the file
and then using its image width and height to create a new bitmap... load the
image and do whatever you need to do.
Hope this helps.....................................
private void WriteImage(ref byte[] ImageData, ref HttpContext context,
ImageType imgType, string cacheKey)
{
System.Drawing.Image myImage = null;
MemoryStream myStream = new MemoryStream();
MemoryStream processedMemStream = new MemoryStream();
try
{
myStream.Write(ImageData, 0, ImageData.Length);
myImage = System.Drawing.Image.FromStream(myStream);
int imageWidth = myImage.Width;
int imageHeight = myImage.Height;
int processedHeight;
if(imgType == ImageType.Full)
{
processedHeight = imageWidth;
}
else
{
processedHeight = (int)imgType;
}
double multiplicationFactor =
(double)processedHeight/(double)imageHeight;
int processedWidth = (int)( (double)imageWidth * multiplicationFactor);
Bitmap processedBP = new Bitmap(processedWidth, processedHeight);
Graphics g = Graphics.FromImage(processedBP);
try
{
g.SmoothingMode =SmoothingMode.HighQuality;
g.InterpolationMode =InterpolationMode.HighQualityBicubic;
g.PixelOffsetMode =PixelOffsetMode.HighQuality;
Rectangle rect=new Rectangle(0,0,processedWidth,processedHeight);
//Draw the old image on to the new image using the graphics object:
g.DrawImage(myImage,rect,0,0,myImage.Width,myImage .Height,GraphicsUnit.Pixel
);
processedBP.RotateFlip(RotateFlipType.Rotate180Fli pNone);
processedBP.RotateFlip(RotateFlipType.Rotate180Fli pNone);
processedBP.Save(processedMemStream, ImageFormat.Jpeg);
byte[] processedImageData = processedMemStream.ToArray();
if(processedImageData != null)
{
context.Cache.Add(cacheKey, processedImageData, null,
Cache.NoAbsoluteExpiration, TimeSpan.FromMinutes(10),
CacheItemPriority.Normal, new
CacheItemRemovedCallback(this.RemovedCallback));
context.Response.BinaryWrite(processedImageData);
processedImageData = null;
}
}
finally
{
g.Dispose();
processedBP.Dispose();
}
}
finally
{
processedMemStream.Close();
myStream.Close();
myImage.Dispose();
}
}
--
Regards,
Hermit Dave
(
http://hdave.blogspot.com)
"Daniel" <dan@kenaday.com> wrote in message
news:1bf3d4d3.0410040710.1706d06a@posting.google.c om...[color=blue]
> I have looked everywhere on the web for an answer to this and the only
> thing I can find is converting the image format when the file is
> present on the local filesystem. What I want to do is use a web form
> to upload a TIFF image (scanned images) and convert it to a JPEG
> before I insert it into SQL Server. The file upload part works great,
> but I can;t convert the image. I certainly don't want to upload it the
> the server filesystem, convert it, upload it and then delete it. That
> would just be too expensive.
>
> I'm pretty new at using .net and it seems like it should be easy
> enough to do, but I can't get it to work for the life of me. I will
> post my code below to help.
>
> // Processes click on our cmdSend button
> private void cmdSend_Click(object sender, System.EventArgs e)
> {
> // Check to see if file was uploaded
> if( filMyFile.PostedFile != null )
> {
> // Get a reference to PostedFile object
> HttpPostedFile myFile = filMyFile.PostedFile;
>
> // Get size of uploaded file
> int nFileLen = myFile.ContentLength;
>
> // make sure the size of the file is > 0
> if( nFileLen > 0 )
> {
> // Allocate a buffer for reading of the file
> byte[] myData = new byte[nFileLen];
>
> // Read uploaded file from the Stream
> myFile.InputStream.Read(myData, 0, nFileLen);
>
> // Create a name for the file to store
> string strFilename = Path.GetFileName(myFile.FileName);
>
> // If TIFF, convert image to JPEG
>
>
> //Get the patient id
> string strID = Request.Form["ID"];
>
> // Store it in database
> int nFileID = WriteToDB(strFilename, myFile.ContentType, ref
> myData, strID);
>
> // Set label's text
> lblInfo.Text =
> "Filename: " + strFilename + "<br>" +
> "Size: " + nFileLen.ToString() + "<p>";
>
>
> // Set URL of the the object to point to the this script with ID
> of the file
> // that will retreive file out the database
> //imgDB.ImageUrl = GetMyName() + "?FileID=" + nFileID.ToString();
> //imgDB.ToolTip = "This file was stored in database.";
> lblText2.Text = "File was uploaded successfully.";
>
> // show the images and text
> //imgDB.Visible = true;
> lblInfo.Visible = true;
> lblText2.Visible = true;
> }
> }
> }[/color]
