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copied!<p>If you want to get the image dimensions (width and hight) with out loading the image, you need to read some part of jpeg file yourself as below. </p> <p>Here is an out of the box method for you :)</p> <pre><code>public static Size GetJpegImageSize(string filename) { FileStream stream=null; BinaryReader rdr=null; try { stream=File.OpenRead(filename); rdr=new BinaryReader(stream); // keep reading packets until we find one that contains Size info for(; ; ) { byte code=rdr.ReadByte(); if(code!=0xFF) throw new ApplicationException( "Unexpected value in file "+filename); code=rdr.ReadByte(); switch(code) { // filler byte case 0xFF: stream.Position--; break; // packets without data case 0xD0: case 0xD1: case 0xD2: case 0xD3: case 0xD4: case 0xD5: case 0xD6: case 0xD7: case 0xD8: case 0xD9: break; // packets with size information case 0xC0: case 0xC1: case 0xC2: case 0xC3: case 0xC4: case 0xC5: case 0xC6: case 0xC7: case 0xC8: case 0xC9: case 0xCA: case 0xCB: case 0xCC: case 0xCD: case 0xCE: case 0xCF: ReadBEUshort(rdr); rdr.ReadByte(); ushort h=ReadBEUshort(rdr); ushort w=ReadBEUshort(rdr); return new Size(w, h); // irrelevant variable-length packets default: int len=ReadBEUshort(rdr); stream.Position+=len-2; break; } } } finally { if(rdr!=null) rdr.Close(); if(stream!=null) stream.Close(); } } private static ushort ReadBEUshort(BinaryReader rdr) { ushort hi=rdr.ReadByte(); hi<<=8; ushort lo=rdr.ReadByte(); return (ushort)(hi|lo); } </code></pre> <p>This is not my code, got this example some time back in code project. I copied and and saved it to my utility snippets, don't remember the link though.</p>

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