Image Resizer for ASP.NET

Question

Anyone knows of any good Image resize API for ASP.net? TIA

Answer 1

Checkout System.Drawing Namespace

MSDN Documentation

Resizing Image - Stack Overflow Question

Answer 2

Resizing images is simple enough not to need an API. I wrote my own for this task. here's a bit if code to start you out down that path.

// get original image
System.Drawing.Image orignalImage =  Image.FromFile(originalPath);
// create a new image at the desired size
System.Drawing.Bitmap newImage = new Bitmap(450, 338);
// create grpahics object to draw with
System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(newImage);
//draw the new image
g.DrawImage(orignalImage, r);
// save the new image    
newImage.Save(System.IO.Path.Combine(OUTPUT_FOLDER_PATH , ImageName.Replace(" ", "")));

Answer 3

I'll provide this as an alternative to the other answers provided. Image Magick is a very powerful and mature image processing library that you can use from .net. I've had a lot of success with it.

http://www.imagemagick.org/script/index.php

Answer 4

Here's what I use:

internal static System.Drawing.Image FixedSize(System.Drawing.Image imgPhoto, int Width, int Height)
{
    int sourceWidth = Convert.ToInt32(imgPhoto.Width);
    int sourceHeight = Convert.ToInt32(imgPhoto.Height);
    int sourceX = 0;
    int sourceY = 0;
    int destX = 0;
    int destY = 0;

    float nPercent = 0;
    float nPercentW = 0;
    float nPercentH = 0;

    nPercentW = ((float)Width / (float)sourceWidth);
    nPercentH = ((float)Height / (float)sourceHeight);
    if (nPercentH < nPercentW)
    {
        nPercent = nPercentH;
        destX = System.Convert.ToInt16((Width -
            (sourceWidth * nPercent)) / 2);
    }
    else
    {
        nPercent = nPercentW;
        destY = System.Convert.ToInt16((Height -
            (sourceHeight * nPercent)) / 2);
    }

    int destWidth = (int)(sourceWidth * nPercent);
    int destHeight = (int)(sourceHeight * nPercent);

    Bitmap bmPhoto = new Bitmap(Width, Height,
        PixelFormat.Format24bppRgb);
    bmPhoto.SetResolution(imgPhoto.HorizontalResolution,
        imgPhoto.VerticalResolution);

    Graphics grPhoto = Graphics.FromImage(bmPhoto);
    grPhoto.Clear(Color.Black);
    grPhoto.InterpolationMode =
        InterpolationMode.HighQualityBicubic;

    grPhoto.DrawImage(imgPhoto,
        new Rectangle(destX, destY, destWidth, destHeight),
        new Rectangle(sourceX, sourceY, sourceWidth, sourceHeight),
        GraphicsUnit.Pixel);

    grPhoto.Dispose();
    return bmPhoto;
}

Usage is pretty simple:

System.Drawing.Image orignalImage =  Image.FromFile(filePath);
System.Drawing.Image resizedImage = FixedSize(originalImage, 640, 480);