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    <p>I had to solve this same problem today. I wanted it to work for images of any width:height ratio. </p> <p>Here's my method to find the point 'unscaled_p' on the original full-sized image.</p> <pre><code> Point p = pictureBox1.PointToClient(Cursor.Position); Point unscaled_p = new Point(); // image and container dimensions int w_i = pictureBox1.Image.Width; int h_i = pictureBox1.Image.Height; int w_c = pictureBox1.Width; int h_c = pictureBox1.Height; </code></pre> <p>The first trick is to determine if the image is a horizontally or vertically larger relative to the container, so you'll know which image dimension fills the container completely.</p> <pre><code> float imageRatio = w_i / (float)h_i; // image W:H ratio float containerRatio = w_c / (float)h_c; // container W:H ratio if (imageRatio &gt;= containerRatio) { // horizontal image float scaleFactor = w_c / (float)w_i; float scaledHeight = h_i * scaleFactor; // calculate gap between top of container and top of image float filler = Math.Abs(h_c - scaledHeight) / 2; unscaled_p.X = (int)(p.X / scaleFactor); unscaled_p.Y = (int)((p.Y - filler) / scaleFactor); } else { // vertical image float scaleFactor = h_c / (float)h_i; float scaledWidth = w_i * scaleFactor; float filler = Math.Abs(w_c - scaledWidth) / 2; unscaled_p.X = (int)((p.X - filler) / scaleFactor); unscaled_p.Y = (int)(p.Y / scaleFactor); } return unscaled_p; </code></pre> <p>Note that because Zoom centers the image, the 'filler' length has to be factored in to determine the dimension that is not filled by the image. The result, 'unscaled_p', is the point on the unscaled image that 'p' correlates to.</p> <p>Hope that helps!</p>
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