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All type of  Image resize with 0%  quality loss

Posted on 2009-04-10
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Last Modified: 2012-05-06
Hello Experts,

We are developing one website using ASp.net 2.0 and sqlserver 2005.

User can upload any size of image and their snaps from website just like picasa and other sites.

there is no size restriction they can upload any size image.

i just want to resize it  with same image ratio but image quality needs to be maintain. it shoul not get distorted.

is that possible using any component ? or

we can manage it through coading ?

Thanks.
Kinjal
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Question by:dotsandcoms
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4 Comments
 
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Accepted Solution

by:
Chad Smith earned 1500 total points
ID: 24115365


public void ResizeImage(double scaleFactor, Stream fromStream,Stream toStream)
{
    var image = Image.FromStream(fromStream);
    var newWidth = (int)(image.Width * scaleFactor);
    var newHeight = (int)(image.Height * scaleFactor);
    var thumbnailBitmap = new Bitmap(newWidth, newHeight);
 
    var thumbnailGraph = Graphics.FromImage(thumbnailBitmap);
    thumbnailGraph.CompositingQuality =CompositingQuality.HighQuality;
    thumbnailGraph.SmoothingMode = SmoothingMode.HighQuality;
    thumbnailGraph.InterpolationMode =InterpolationMode.HighQualityBicubic;
 
    var imageRectangle = new Rectangle(0, 0, newWidth, newHeight);
    thumbnailGraph.DrawImage(image, imageRectangle);
 
    thumbnailBitmap.Save(toStream, image.RawFormat);
 
    thumbnailGraph.Dispose();
    thumbnailBitmap.Dispose();
    image.Dispose();
}
 

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Author Comment

by:dotsandcoms
ID: 24121225
Can i have input values for  fromstream and tostream ?

I mean code to assign input values for fromstream and tostream


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LVL 10

Expert Comment

by:Chad Smith
ID: 24122055
This code will put an Image into a MemoryStream
            MemoryStream ms = new MemoryStream();
            Image img = Image.FromFile("file.name");
            img.Save(ms, ImageFormat.Jpeg);

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Author Comment

by:dotsandcoms
ID: 24128128
how to write code for tostream as we had not created any file for that yet ?

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