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    <h2>Note:</h2> <p>The answer is in C# not Javascript, there is no way to do this in JS and that was not a requirement in the original question.</p> <h2>About your original question</h2> <p>This is a big dependency of what you consider a "high quality" Image (nice reading BTW). But anyway the quality factor is not stored directly in the JPEG file, so you cannot read directly from the file.</p> <p>Most of these factors involve complex imaging algorithms. But do not be disappointed, you can read some properties using the <code>PropertyItems</code> property on the Image class and make some calculations to get an idea of the quality of the image based on size and dpi or ppi. This is a simple example:</p> <pre><code>Bitmap bmp = new Bitmap("winter.jpg"); Console.WriteLine("Image resolution: " + bmp.HorizontalResolution + " DPI"); Console.WriteLine("Image resolution: " + bmp.VerticalResolution + " DPI"); Console.WriteLine("Image Width: " + bmp.Width); Console.WriteLine("Image Height: " + bmp.Height); </code></pre> <p>This will help too: <a href="https://stackoverflow.com/questions/2207187/how-can-i-get-the-resolution-of-an-image-jpeg-gif-png-jpg">How can I get the resolution of an image? (JPEG, GIF, PNG, JPG)</a></p> <blockquote> <p>"But I want to check selected files image quality before uploading"</p> </blockquote> <p>If you want to check the image quality before upload (as you said in comments), that's a big plus to the question. The only built-in method to get the numbers you're after is by creating a new instance (and decoding the entire image) - which is going to be highly inefficient. But... hey! here is a start point: <a href="https://stackoverflow.com/questions/552467/how-do-i-reliably-get-an-image-dimensions-in-net-without-loading-the-image">How do I reliably get an image dimensions in .NET without loading the image?</a></p> <h2>Further reading:</h2> <ul> <li><a href="http://www.codeproject.com/Articles/35978/Reading-Image-Headers-to-Get-Width-and-Height" rel="nofollow noreferrer">Reading Image Headers to Get Width and Height</a></li> <li><a href="http://en.wikipedia.org/wiki/Image_quality" rel="nofollow noreferrer">http://en.wikipedia.org/wiki/Image_quality</a></li> </ul>
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