WLC_Programming Knowledge

using System;
using System.Drawing;
using System.Windows.Forms;
using System.Drawing.Imaging;
using System.IO;

namespace ImgProcessing
{
    public partial class frmMain : Form
    {
        public frmMain()
        {
            InitializeComponent();
        }

        private void btnLoadImage_Click(object sender, EventArgs e)
        {
            LoadPicture(picOriginalImg);
        }

        public void LoadPicture(PictureBox pic)
        {
            OpenFileDialog openFD = new OpenFileDialog();
            openFD.Title = "Insert an Image";
            openFD.Filter = "JPEG Images|*.jpg|PNG Images |*.png";
            if (openFD.ShowDialog() == DialogResult.OK) {
                pic.Image = Image.FromFile(openFD.FileName);
            }
        }  

        private void btnChangeImgType_Click(object sender, EventArgs e)
        {
            ChangeImageType(picOriginalImg.Image);             
        }

        public void ChangeImageType(Image img)
        {
            SaveFileDialog saveFD = new SaveFileDialog();
            saveFD.Title = "Save an Image";
            saveFD.Filter = "Bitmap(*.bmp)|*.Bmp|Joint Photographic Experts Group(*.jpeg)|*.Jpeg|Portable Network Graphics(*.png)|*.Png|
                                   Tagged Image File Format(*.tiff)|*.Tiff|Graphics Interchange Format(*.gif)|*.Gif";

            if (saveFD.ShowDialog() == DialogResult.OK) {
                FileStream fileLocation = (FileStream)saveFD.OpenFile();
                switch (saveFD.FilterIndex) {
                    case 1: img.Save(fileLocation, ImageFormat.Bmp); break;
                    case 2: img.Save(fileLocation, ImageFormat.Jpeg); break;
                    case 3: img.Save(fileLocation, ImageFormat.Png); break;
                    case 4: img.Save(fileLocation, ImageFormat.Tiff); break;
                    case 5: img.Save(fileLocation, ImageFormat.Gif); break;
                }
            }          
        }
    }
}