Resize image without losing resolutions

Jose Saiz

10y979.NET

Hi, Guys I am looking for a straight ASP.NET C# coding (no third party assembly please) that works at least 98% resizing the uploaded image from original size to lower size without losing its resolutions and vectors.

Explain:

I have a web application that allows the user to upload the picture taken from their staff usually the picture taken with any camera then upload to the hosted site, the goal is to use the same uploaded picture and resize it to a (2 inches X 2 inches) to be used on a non-printable photo ID what I mean by non-printable is that the photo ID will only be used on RGB or Monitor display not to be printed, I have tried quite a bit code found but neither one helped resized pictured pixelated and distorted I also found another code that works well in windows environment but not in web environment in other word the code does not convert the web image control to an image control, can any one help and if is not much asking could you also provide coding and sample how to use the code.

This is my photo ID code

<%---- FROM Original uploaded picture --- %>

<%---- TO Resized from uploaded picture(picture above mentioned) to 2 x 2 size photo ID--- %>

TIA

Jose

3 Replies

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Rajeesh Menoth10y ago
Hi,

Pass your source path in that code.Then check I think it will work.
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Jose Saiz10y ago
Thank for the Reply Rajeesh, I have tried that and it works great when uploading images but what about when the images are already uploaded I know how to get the images from the drive-folder
but I need to resize the images found in the drive-folder to any size wanted explain
I have a drive-folder as follow
~/images/photos/image1.jpg (Original Size is 1024x768)
~/images/photos/image2.jpg (Original Size is 960x512)
~/images/photos/image3.jpg (Original Size is 860x400)
~/images/photos/image4.jpg (Original Size is 712x420)
~/images/photos/image5.jpg (Original Size is 512x768)

For Instance:
And I want to be able to resize the first image1.jpg to 450x450 pixels without losing the resolution.

Can the above mentioned be possible without using the upload version of your code.?
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Rajeesh Menoth10y ago
Hi,

private void GenerateThumbnails(double scaleFactor, Stream sourcePath, string targetPath)
{
using (var image = Image.FromStream(sourcePath))
{
var newWidth = (int)(image.Width * scaleFactor);
var newHeight = (int)(image.Height * scaleFactor);
var thumbnailImg = new Bitmap(newWidth, newHeight);
var thumbGraph = Graphics.FromImage(thumbnailImg);
thumbGraph.CompositingQuality = CompositingQuality.HighQuality;
thumbGraph.SmoothingMode = SmoothingMode.HighQuality;
thumbGraph.InterpolationMode = InterpolationMode.HighQualityBicubic;
var imageRectangle = new Rectangle(0, 0, newWidth, newHeight);
thumbGraph.DrawImage(image, imageRectangle);
thumbnailImg.Save(targetPath, image.RawFormat);
}

Reference :

http://www.aspdotnet-suresh.com/2011/05/how-to-resize-size-image-without-losing.html

The answer is helpful.Then please accept it..!!
0