图片缩放的相关处理

图片缩放的相关处理

最近自己做的点东西上用到了图片的处理,不过没有找到合适的图片处理相关算法,倒是找到了几个获取缩略图的算法。代码不长,简单看了看原理也比较简单(其实不是简单是C#的封装的太多了,所以显得比较简单)。既然没有相关的统一调用的代码,索性,我来整理一套相关的处理代码然后公开出来吧。

图片处理的相关分析

其实我要用的图片处理非常简单,就是简单的压缩一下图片。然后把图片设置到对应大小而已。但是对于设置的方式,C#基础的函数中使用的Rect范围设置。这个范围设置计算起来可能相对头疼一些。所以我在考虑要不要让调用者在忽略Rect这个参数的情况愉快的调用接口呢?于是乎,我定义了几个图片缩放类型(Full、Zoom、Overflow、Original)。然后默认的让原始图片的中心点与输出图片的中心点对齐。然后根据缩放类型来对图片进行不同的缩放模式。

缩放模式

  1. Full:让图片放弃原来的比例,直接按照目标数据进行拉伸
  2. Zoom:让图片保持原有比例,并且保证原始图片在目标图片的正中央,没有图片的位置保留米白色
  3. Original:让图片保持原来的大小,输出图片类似于裁剪中间位置某个范围的图片
  4. Overflow:让图片保持原来的比例,并且保证输目标是被图片填满的不留空白

调用的范例

ImageHelper.GetInstance().ImageCompress(InputFile, Path.Combine(OutPutPath, item_file), new System.Drawing.Size(500, 300), ImageZoomType.Full, 50);

样品展示

原始图片

Full 300*500 

 

Full 500 * 300

 

Original 300 * 500

 

Original 500 * 300

 

Overflow 300 * 500

 

Overflow 500 * 300

 

Zoom 300 * 500

 

Zoom 500 * 300

存在的不足

  1. 压缩没有独到的技术
  2. 目前只支持JPEG格式的图片
  3. 部分图片进行缩放之后会留下一个1像素浅浅的边

后续的内容

图片处理不光是缩放,还有其他的很多东西比较实用(截图、压缩、按高缩放、按宽缩放、添加水印、添加隐藏水印),我准备把图片常用的相关处理。整理成一个帮助类,方便迁入到各个项目中去。

所以我建立了一个专门的图片处理的开源项目方便后续功能加入,地址如下:http://git.oschina.net/anxin1225/ImageCompress

 

压缩相关的代码

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ImageCompress
{
    public struct AnchorPoint
    {
        //public AnchorPoint() : this(0, 0) { }
        public AnchorPoint(double x, double y)
        {
            X = x;
            Y = y;
        }

        public double X, Y;
    }

    public enum ImageZoomType
    {
        Full,
        Zoom,
        Overflow,
        Original,
    }

    public delegate void ImageHandle(Image image, Bitmap bitmap);

    public class ImageHelper
    {
        private ImageHelper() { }

        private static ImageHelper _image_helper = null;
        private Dictionary<ImageZoomType, ImageHandle> _name_to_handle = new Dictionary<ImageZoomType, ImageHandle>();

        public static ImageHelper GetInstance()
        {
            if (_image_helper == null)
            {
                _image_helper = new ImageHelper();

                //填满
                _image_helper._name_to_handle[ImageZoomType.Full] = (image, bitmap) =>
                {
                    _image_helper.DrawImage(image, bitmap, new Rectangle(new Point(0, 0), bitmap.Size));
                };

                //原始
                _image_helper._name_to_handle[ImageZoomType.Original] = (image, bitmap) =>
                {
                    _image_helper.DrawImage(image, bitmap, 1, new AnchorPoint(0.5, 0.5), new AnchorPoint(0.5, 0.5));
                };

                //溢出
                _image_helper._name_to_handle[ImageZoomType.Overflow] = (image, bitmap) =>
                {
                    float proportion_x = (float)bitmap.Width / image.Width;
                    float proportion_y = (float)bitmap.Height / image.Height;
                    _image_helper.DrawImage(image, bitmap, proportion_x > proportion_y ? proportion_x : proportion_y, new AnchorPoint(0.5, 0.5), new AnchorPoint(0.5, 0.5));
                };

                //缩放
                _image_helper._name_to_handle[ImageZoomType.Zoom] = (image, bitmap) =>
                {
                    float proportion_x = (float)bitmap.Width / image.Width;
                    float proportion_y = (float)bitmap.Height / image.Height;
                    _image_helper.DrawImage(image, bitmap, proportion_x < proportion_y ? proportion_x : proportion_y, new AnchorPoint(0.5, 0.5), new AnchorPoint(0.5, 0.5));
                };
            }

            return _image_helper;
        }

        /// <summary>
        /// 压缩图片
        /// </summary>
        /// <param name="source_path">源数据位置</param>
        /// <param name="save_path">保存数据位置</param>
        /// <param name="save_size">保存图片大小</param>
        /// <param name="ztype">缩放模式</param>
        /// <param name="flag">图片保存品质</param>
        /// <returns>是否完成压缩</returns>
        public bool ImageCompress(string source_path, string save_path, Size save_size, ImageZoomType ztype, int flag)
        {
            bool success = false;

            Image source = null;

            while (true)
            {
                source = LoadImage(source_path);
                if (source == null)
                    break;

                Bitmap bitmap = new Bitmap(save_size.Width, save_size.Height);

                if (_name_to_handle.ContainsKey(ztype))
                {
                    _name_to_handle[ztype](source, bitmap);
                }
                else
                {
                    break;
                }

                success = SaveImage(bitmap, save_path, source.RawFormat, flag);
                break;
            }

            if (source != null)
                source.Dispose();

            return success;
        }

        public Image LoadImage(string source_path)
        {
            Image image = null;
            while (true)
            {
                if (!File.Exists(source_path))
                    break;

                try
                {
                    image = Image.FromFile(source_path);
                }
                catch
                {
                    break;
                }

                break;
            }

            return image;
        }

        /// <summary>
        /// 将BitMap保存到磁盘上
        /// </summary>
        /// <param name="image">需要保存的图片</param>
        /// <param name="save_path">保存的路径</param>
        /// <param name="format">保存格式</param>
        /// <param name="flag">保存质量</param>
        /// <returns></returns>
        public bool SaveImage(Bitmap image, string save_path, ImageFormat format, int flag)
        {
            //以下代码为保存图片时,设置压缩质量  
            EncoderParameters ep = new EncoderParameters();
            long[] qy = new long[1];
            qy[0] = flag;//设置压缩的比例1-100  
            EncoderParameter eParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, qy);
            ep.Param[0] = eParam;
            try
            {
                ImageCodecInfo[] arrayICI = ImageCodecInfo.GetImageEncoders();
                ImageCodecInfo jpegICIinfo = null;
                for (int x = 0; x < arrayICI.Length; x++)
                {
                    if (arrayICI[x].FormatDescription.Equals("JPEG"))
                    {
                        jpegICIinfo = arrayICI[x];
                        break;
                    }
                }
                if (jpegICIinfo != null)
                {
                    image.Save(save_path, jpegICIinfo, ep);//dFile是压缩后的新路径  
                }
                else
                {
                    image.Save(save_path, format);
                }
                return true;
            }
            catch
            {
                return false;
            }
            finally
            {
                image.Dispose();
            }
        }

        /// <summary>
        /// 画图
        /// </summary>
        /// <param name="source">原始图像</param>
        /// <param name="output">输出图像</param>
        /// <param name="souce_scale">原始图像的缩放值</param>
        /// <param name="souce_anchor"></param>
        /// <param name="graphics_anchor"></param>
        public void DrawImage(Image source, Bitmap output, float souce_scale, AnchorPoint souce_anchor, AnchorPoint graphics_anchor)
        {
            DrawImage(source, output, souce_scale, souce_anchor, new Point((int)(output.Width * graphics_anchor.X), (int)(output.Height * graphics_anchor.Y)));
        }

        /// <summary>
        /// 画图
        /// </summary>
        /// <param name="source">原始图像</param>
        /// <param name="output">输出凸显</param>
        /// <param name="source_scale">图像的所放值</param>
        /// <param name="source_anchor">源图像锚点</param>
        /// <param name="souce_point">图像位置</param>
        public void DrawImage(Image source, Bitmap output, float source_scale, AnchorPoint source_anchor, Point souce_point)
        {
            var pic_po = new Point((int)(souce_point.X - source.Size.Width * source_scale * source_anchor.X), (int)(souce_point.Y - source.Size.Height * source_scale * source_anchor.Y));
            DrawImage(source, output, new Rectangle(pic_po, new Size((int)(source.Width * source_scale), (int)(source.Height * source_scale))));
        }

        /// <summary>
        /// 画图
        /// </summary>
        /// <param name="source"></param>
        /// <param name="output"></param>
        /// <param name="rect"></param>
        public void DrawImage(Image source, Bitmap output, Rectangle rect)
        {
            Graphics g = Graphics.FromImage(output);
            g.Clear(Color.WhiteSmoke);
            g.CompositingQuality = CompositingQuality.HighQuality;
            g.SmoothingMode = SmoothingMode.HighQuality;
            g.InterpolationMode = InterpolationMode.HighQualityBicubic;
            g.DrawImage(source, rect, 0, 0, source.Width, source.Height, GraphicsUnit.Pixel);
            g.Dispose();
        }
    }
}

  

 

PS:为了美观本文中的原始图片并不是原始图片,因为原始图片太大了。会造成页面滑动,所以我上传了一张较小的图片。Git的图片则是原始的图片

posted @ 2016-09-22 13:00  连程  阅读(1110)  评论(6编辑  收藏  举报