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    <p>Here's a method for cropping a wider image, so that you can understand the concept.</p> <p>First calculate the extra width of the image. i.e how much additional space it is taking more than a 4:3 ratio of the same.</p> <p>Consider I want to crop a 1366 x 768 picture to 1024 x 768.</p> <p>Here we can calculate the extra_width with the height (768px):</p> <pre><code>4 / 3 * (768) = 1024 </code></pre> <p>So, that gives you the target width for a 768 height.</p> <p>Now the extra width is:</p> <pre><code>1366 - 1024 </code></pre> <p>Now you can crop the image by putting the starting crop point to 1/2 of the extra_width, and select the full_height.</p> <pre><code> Image cropImg(Image img) { // 4:3 Aspect Ratio. You can also add it as parameters double aspectRatio_X = 4; double aspectRatio_Y = 3; double imgWidth = Convert.ToDouble(img.Width); double imgHeight = Convert.ToDouble(img.Height); if (imgWidth / imgHeight &gt; (aspectRatio_X / aspectRatio_Y)) { double extraWidth = imgWidth - (imgHeight * (aspectRatio_X / aspectRatio_Y)); double cropStartFrom = extraWidth / 2; Bitmap bmp = new Bitmap((int)(img.Width - extraWidth), img.Height); Graphics grp = Graphics.FromImage(bmp); grp.DrawImage(img, new Rectangle(0, 0, (int)(img.Width - extraWidth), img.Height), new Rectangle((int)cropStartFrom, 0, (int)(imgWidth - extraWidth), img.Height), GraphicsUnit.Pixel); return (Image)bmp; } else return null; } private void button1_Click(object sender, EventArgs e) { pictureBox2.Image = cropImg(pictureBox1.Image); } </code></pre>
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    1. POcrop image to 4:3 aspect ratio c#
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