[C#] 이미지 밝기 조절(Image Brightness)

2021. 4. 19. 11:58

* C# 이미지 밝기 조절 (Image Brightness) 예제...

- 사용한 컨트롤 : Button 3개, PictureBox 1개

전체 소스 코드

Form1.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace CSharp_ImageBrightness
{
    public partial class Form1 : Form
    {

        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            OpenFileDialog ofd = new OpenFileDialog();

            ofd.Filter = "JPG File(*.jpg) | *.jpg"; 
            if (ofd.ShowDialog() == DialogResult.OK)
            {
                pictureBox1.Image = new Bitmap(ofd.FileName);
            }

        }

        private void button2_Click(object sender, EventArgs e)
        {
            //20 씩 밝기 증가
            pictureBox1.Image = BrightnessImage(pictureBox1.Image, 20);
        }

        private void button3_Click(object sender, EventArgs e)
        {
            //20 씩 밝기 감소
            pictureBox1.Image = BrightnessImage(pictureBox1.Image, -20);
        }

        private Bitmap BrightnessImage(Image imSource, int iBrightness)
        {
            Bitmap btTmp = new Bitmap(imSource);
            Color cTmp;
            int iR, iG, iB;

            for (int iY = 0; iY < btTmp.Height; iY++)
            {
                for (int iX = 0; iX < btTmp.Width; iX++)
                {
                    cTmp = btTmp.GetPixel(iX, iY);

                    iR = Math.Max(0, Math.Min(255, cTmp.R + iBrightness));
                    iG = Math.Max(0, Math.Min(255, cTmp.G + iBrightness));
                    iB = Math.Max(0, Math.Min(255, cTmp.B + iBrightness));

                    cTmp = Color.FromArgb(iR, iG, iB);
                    btTmp.SetPixel(iX, iY, cTmp);
                }
            }

            return btTmp;

        }

    }
}