生成高品质小空间的缩略图C#代码

大家讲道理
发布: 2016-11-11 14:46:49
原创
1555人浏览过

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Drawing;
using System.IO;
 
namespace ConsoleApplication3_ThumbnailImg
{
    class Program
    {
        const int HEIGHT = 190;
        const int WIDTH = 190;
        static void Main(string[] args)
        {
            string srcImgPath = @"G:\photoes\20060725\Picture 057.jpg";
            string targetFolder = @"E:\Diary\Test\thumbnail";
 
            SetThumbnail_1(srcImgPath, targetFolder);
            SetThumbnail_2(srcImgPath, targetFolder);
            SetThumbnail_3(srcImgPath, targetFolder);
 
            Console.Read();
        }
 
        static void SetThumbnail_1(string srcImgPath, string targetFolder)
        {
            using (Bitmap source = new Bitmap(srcImgPath))
            {
                // return the source image if it's smaller than the designated thumbnail   
                int wi, hi;
                wi = WIDTH;
                hi = HEIGHT;
 
                // maintain the aspect ratio despite the thumbnail size parameters   
                if (source.Width > source.Height)
                {
                    wi = WIDTH;
                    hi = (int)(source.Height * ((decimal)WIDTH / source.Width));
                }
                else
                {
                    hi = HEIGHT;
                    wi = (int)(source.Width * ((decimal)HEIGHT / source.Height));
                }
 
                using (Image thumb = source.GetThumbnailImage(wi, hi, null, IntPtr.Zero))
                {
                    string targetPath = Path.Combine(targetFolder, "th_1.jpg");
                    thumb.Save(targetPath);
                }
            }
        }
 
        static void SetThumbnail_2(string srcImgPath, string targetFolder)
        {
            using (Bitmap source = new Bitmap(srcImgPath))
            {
                // return the source image if it's smaller than the designated thumbnail   
                int wi, hi;
                wi = WIDTH;
                hi = HEIGHT;
 
                // maintain the aspect ratio despite the thumbnail size parameters   
                if (source.Width > source.Height)
                {
                    wi = WIDTH;
                    hi = (int)(source.Height * ((decimal)WIDTH / source.Width));
                }
                else
                {
                    hi = HEIGHT;
                    wi = (int)(source.Width * ((decimal)HEIGHT / source.Height));
                }
 
                // original code that creates lousy thumbnails   
                // System.Drawing.Image ret = source.GetThumbnailImage(wi,hi,null,IntPtr.Zero);   
                using (System.Drawing.Bitmap thumb = new Bitmap(wi, hi))
                {
                    using (Graphics g = Graphics.FromImage(thumb))
                    {
                        g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
                        g.FillRectangle(Brushes.White, 0, 0, wi, hi);
                        g.DrawImage(source, 0, 0, wi, hi);
                    }
                    string targetPath = Path.Combine(targetFolder, "th_2.jpg");
                    thumb.Save(targetPath);
                }
 
            }
        }
 
        static void SetThumbnail_3(string srcImgPath, string targetFolder)
        {
            //Configure JPEG Compression Engine   
            System.Drawing.Imaging.EncoderParameters encoderParams = new System.Drawing.Imaging.EncoderParameters();
            long[] quality = new long[1];
            quality[0] = 75;
            System.Drawing.Imaging.EncoderParameter encoderParam = new System.Drawing.Imaging.EncoderParameter(System.Drawing.Imaging.Encoder.Quality, quality);
            encoderParams.Param[0] = encoderParam;
 
            System.Drawing.Imaging.ImageCodecInfo[] arrayICI = System.Drawing.Imaging.ImageCodecInfo.GetImageEncoders();
            System.Drawing.Imaging.ImageCodecInfo jpegICI = null;
            for (int x = 0; x < arrayICI.Length; x++)
            {
                if (arrayICI[x].FormatDescription.Equals("JPEG"))
                {
                    jpegICI = arrayICI[x];
                    break;
                }
            }
 
            using (Bitmap source = new Bitmap(srcImgPath))
            {
                int wi, hi;
                wi = WIDTH;
                hi = HEIGHT;
 
                // maintain the aspect ratio despite the thumbnail size parameters   
                if (source.Width > source.Height)
                {
                    wi = WIDTH;
                    hi = (int)(source.Height * ((decimal)WIDTH / source.Width));
                }
                else
                {
                    hi = HEIGHT;
                    wi = (int)(source.Width * ((decimal)HEIGHT / source.Height));
                }
 
                // original code that creates lousy thumbnails   
                // System.Drawing.Image ret = source.GetThumbnailImage(wi,hi,null,IntPtr.Zero);   
                using (System.Drawing.Bitmap thumb = new Bitmap(wi, hi))
                {
                    using (Graphics g = Graphics.FromImage(thumb))
                    {
                        g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
                        g.FillRectangle(Brushes.White, 0, 0, wi, hi);
                        g.DrawImage(source, 0, 0, wi, hi);
                    }
                    string targetPath = Path.Combine(targetFolder, "th_3.jpg");
                    thumb.Save(targetPath, jpegICI, encoderParams);
                }
 
            }
 
        }
    }
}
登录后复制

最佳 Windows 性能的顶级免费优化软件
最佳 Windows 性能的顶级免费优化软件

每个人都需要一台速度更快、更稳定的 PC。随着时间的推移,垃圾文件、旧注册表数据和不必要的后台进程会占用资源并降低性能。幸运的是,许多工具可以让 Windows 保持平稳运行。

下载
来源:php中文网
本文内容由网友自发贡献,版权归原作者所有,本站不承担相应法律责任。如您发现有涉嫌抄袭侵权的内容,请联系admin@php.cn
作者最新文章
最新问题
开源免费商场系统广告
热门教程
更多>
最新下载
更多>
网站特效
网站源码
网站素材
前端模板
关于我们 免责申明 意见反馈 讲师合作 广告合作 最新更新
php中文网:公益在线php培训,帮助PHP学习者快速成长!
关注服务号 技术交流群
PHP中文网订阅号
每天精选资源文章推送
PHP中文网APP
随时随地碎片化学习
PHP中文网抖音号
发现有趣的

Copyright 2014-2025 https://www.php.cn/ All Rights Reserved | php.cn | 湘ICP备2023035733号