Here are some code I have ever used to crop images: Code
using System.IO;
using System.Drawing.Printing;
using Yiigo.Image;
using Yiigo.Image.Process;
using YGPic Image = new YGPic();
{
string ImageID = (@"C:\ yiigo_example.jpg");
int CropX = "20";
int CropY = "50";
int CropWidth = "200";
int CropHeight = "70";
}
Image.YGPicProcessCrop(@"C:\ yiigo_example.jpg", "20", "50", "200", "70");
Image.save(@"C:\ yiigo_example.jpg");