Resizing gives me to heavy image

Posted by phenevo on Stack Overflow See other posts from Stack Overflow or by phenevo
Published on 2010-06-18T09:17:24Z Indexed on 2010/06/18 9:23 UTC
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Hi,

I'm resizing jpeg 1200x900 ,556kb by method:

public static Image ResizeImage(Image imgToResize, int height) //height=400
{
    int destWidth;
    int destHeight;

    int sourceWidth = imgToResize.Width;
    int sourceHeight = imgToResize.Height;

    float nPercent = 0;

    float nPercentH = 0;


    nPercentH = ((float)height / (float)sourceHeight);


    nPercent = nPercentH;


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

    Bitmap b = new Bitmap(destWidth, destHeight);
    Graphics g = Graphics.FromImage((Image)b);
    g.InterpolationMode = InterpolationMode.HighQualityBicubic;

    g.DrawImage(imgToResize, 0, 0, destWidth, destHeight);
    g.Dispose();
    return b;
}

gives me 555kb 533x400 jpeg.

Why this photo is so heavy.

For photo jpeg 2111kb 2156x1571 I get 556kb 533x400 jpeg

Why in first case is so terrible !

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