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php实现图片按比例截取的方法（php实现图片按比例截取的方法是）

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在这里，我们将给大家分享关于php实现图片按比例截取的方法的知识，让您更了解php实现图片按比例截取的方法是的本质，同时也会涉及到如何更有效地.Net实现上传图片按比例自动缩小或放大的方法、C#图片按

在这里，我们将给大家分享关于php实现图片按比例截取的方法的知识，让您更了解php实现图片按比例截取的方法是的本质，同时也会涉及到如何更有效地.Net实现上传图片按比例自动缩小或放大的方法、C#图片按比例缩放、C#图片按比例缩放实例、C#图片按比例缩放的示例代码分享的内容。

本文目录一览：

php实现图片按比例截取的方法（php实现图片按比例截取的方法是）

php实现图片按比例截取的方法（php实现图片按比例截取的方法是）

本文实例讲述了PHP实现图片按比例截取的方法。分享给大家供大家参考，具体如下：

array("create"=>"ImageCreateFromjpeg","output"=>"imagejpeg","exn"=>".jpg"),"gif" => array("create"=>"ImageCreateFromGIF","output"=>"imagegif","exn"=>".gif"),"jpeg" => array("create"=>"ImageCreateFromjpeg","png" => array("create"=>"imagecreatefrompng","output"=>"imagepng","exn"=>".png"),"wbmp" => array("create"=>"imagecreatefromwbmp","output"=>"image2wbmp","exn"=>".wbmp") ); $imgtype = getimagesize($filename); $width = $imgtype[0]; $height = $imgtype[1]; $type = str_replace('image/','',$imgtype['mime']); $func_create = $all_type[$type]['create']; $func_output = $all_type[$type]['output']; $x = $y =0; if(($width * 100)>($height * 120)) { $newwidth = ceil($height * 120/100); $newheight = $height; $x = ($width-$newwidth)/2; } elseif(($width * 100)<($height * 120)) { $newheight = ceil($width * 100/120); $newwidth = $width; $y = ($height-$newheight)/2; } else { $newheight = $height; $newwidth = $width; } // Load $thumb = imagecreatetruecolor($newwidth,$newheight); $source = $func_create($filename); // Resize imagecopyresized($thumb,$source,$newwidth,$newheight,$newheight); // Output $func_output($thumb,'a.jpeg');

PS：这里再为大家推荐几款比较实用的图片处理工具供大家参考使用：

在线图片转换BASE64工具：

ICO图标在线生成工具：

在线Email邮箱图标制作工具：

在线图片格式转换(jpg/bmp/gif/png)工具：

更多关于PHP相关内容感兴趣的读者可查看本站专题：《》、《》、《》、《》、《》、《》、《》、《》及《PHP常见数据库操作技巧汇总》

希望本文所述对大家PHP程序设计有所帮助。

.Net实现上传图片按比例自动缩小或放大的方法

.Net实现上传图片按比例自动缩小或放大的方法

本文实例主要展示了.Net实现上传图片按比例自动缩小或放大的方法，是非常实用的功能。分享给大家供大家参考之用。具体方法如下：

//// <summary>
/// 按比例缩小图片，自动计算宽度
/// </summary>
/// <param name="strOldPic">源图文件名(包括路径)</param>
/// <param name="strNewPic">缩小后保存为文件名(包括路径)</param>
/// <param name="intHeight">缩小至高度</param>
public void SmallPicWidth(string strOldPic, string strNewPic, int intHeight)
{
  System.Drawing.Bitmap objPic, objNewPic;
  try
  {
 objPic = new System.Drawing.Bitmap(strOldPic);
 int intWidth = (intHeight / objPic.Height) * objPic.Width;
 objNewPic = new System.Drawing.Bitmap(objPic, intWidth, intHeight);
 objNewPic.Save(strNewPic);
  }
  catch (Exception exp) { throw exp; }
  finally
  {
 objPic = null;
 objNewPic = null;
  }
}
/**//// <summary>
/// 缩小图片
/// </summary>
/// <param name="strOldPic">源图文件名(包括路径)</param>
/// <param name="strNewPic">缩小后保存为文件名(包括路径)</param>
/// <param name="intWidth">缩小至宽度</param>
/// <param name="intHeight">缩小至高度</param>
public void SmallPic(string strOldPic, string strNewPic, int intWidth, int intHeight)
{
  System.Drawing.Bitmap objPic, objNewPic;
  try
  {
 objPic = new System.Drawing.Bitmap(strOldPic);
 objNewPic = new System.Drawing.Bitmap(objPic, intWidth, intHeight);
 objNewPic.Save(strNewPic);
  }
  catch (Exception exp)
 { throw exp; }
  finally
  {
 objPic = null;
 objNewPic = null;
  }
}

希望本文所述实例对大家的asp.net程序设计有一定的借鉴价值。

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C#图片按比例缩放

C#图片按比例缩放

工具类代码：

using System;
 System.Collections.Generic;
 System.Drawing;
 System.Drawing.drawing2d;
 System.Drawing.Imaging;
 System.IO;
 System.Linq;
 System.Text;
 System.Threading.Tasks;

namespace ZoomImage.Utils
{
    /// <summary>
    /// 图片缩放
    </summary>
    public class ZoomImageUtil
    {
        #region 图片缩放
        <summary>
         图片缩放
        </summary>
        <param name="bArr">图片字节流</param>
        <param name="width">目标宽度，若为0，表示宽度按比例缩放<param name="height">目标长度，若为0，表示长度按比例缩放</param>
        static byte[] GetThumbnail(byte[] bArr,int width,1)">int height)
        {
            if (bArr == null) return null;
            MemoryStream ms = new MemoryStream(bArr);
            Bitmap bmp = (Bitmap)Image.FromStream(ms);
            ms.Close();

            bmp = GetThumbnail(bmp,width,height);

            ImageCodecInfo imageCodecInfo = GetEncoder(ImageFormat.Jpeg);
            EncoderParameters encoderParameters = new EncoderParameters(1);
            EncoderParameter encoderParameter = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality,75L);
            encoderParameters.Param[0] = encoderParameter;

            ms =  MemoryStream();
            bmp.Save(ms,imageCodecInfo,encoderParameters);
            byte[] result = ms.ToArray();
            ms.Close();
            bmp.dispose();

            return result;
        }
        #endregion

        <param name="bmp">图片private static Bitmap GetThumbnail(Bitmap bmp,1)">if (width == 0 && height == 0)
            {
                width = bmp.Width;
                height = bmp.Height;
            }
            else
            {
                )
                {
                    width = height * bmp.Width / bmp.Height;
                }
                if (height == )
                {
                    height = width * bmp.Height / bmp.Width;
                }
            }

            Image imgSource = bmp;
            Bitmap outBmp =  Bitmap(width,height);
            Graphics g = Graphics.FromImage(outBmp);
            g.Clear(Color.Transparent);
            // 设置画布的描绘质量     
            g.CompositingQuality = CompositingQuality.Default;
            g.SmoothingMode = SmoothingMode.Default;
            g.InterpolationMode = InterpolationMode.Default;
            g.DrawImage(imgSource,new Rectangle(0,height + 1),1)">,imgSource.Width,imgSource.Height,GraphicsUnit.Pixel);
            g.dispose();
            imgSource.dispose();
            bmp.dispose();
             outBmp;
        }
        #region 椭圆形缩放
         椭圆形缩放
        byte[] GetEllipseThumbnail( (Bitmap)Image.FromStream(ms);

            Bitmap newBmp = using (Graphics g = Graphics.FromImage(newBmp))
            {
                using (TextureBrush br =  TextureBrush(bmp))
                {
                    br.ScaleTransform(width / (float)bmp.Width,height / (float)bmp.Height);
                    g.SmoothingMode = System.Drawing.drawing2d.SmoothingMode.AntiAlias;
                    g.FillEllipse(br,1)">new Rectangle(Point.Empty,1)"> Size(width,height)));
                }
            }
            MemoryStream newMs =  MemoryStream();
            newBmp.Save(newMs,System.Drawing.Imaging.ImageFormat.Png);
             newMs.ToArray();

            bmp.dispose();
            newBmp.dispose();
            ms.Close();
            newMs.dispose();

            #region GetEncoder
        static ImageCodecInfo GetEncoder(ImageFormat format)
        {
            ImageCodecInfo[] codecs = ImageCodecInfo.Getimagedecoders();
            foreach (ImageCodecInfo codec in codecs)
            {
                if (codec.FormatID == format.Guid)
                {
                     codec;
                }
            }
            ;
        }
        #endregion

    }
}
View Code

使用示例：

 System.ComponentModel;
 System.Data;
 System.Threading;
 System.Threading.Tasks;
 System.Windows.Forms;
 ZoomImage.Utils;

 ZoomImage
{
    partial  Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        void Form1_Load(object sender,EventArgs e)
        {
            openFileDialog1.Multiselect = true;
        }

        void txtWidth_KeyPress(if (e.KeyChar != 8 && !Char.IsDigit(e.KeyChar))
            {
                e.Handled = ;
            }
        }

        void txtHeight_KeyPress(void btnSelectimage_Click(tryif (txtWidth.Text == "" && txtHeight.Text == "")
                {
                    MessageBox.Show("请输入宽度或高度！");
                    ;
                }

                if (openFileDialog1.ShowDialog() == DialogResult.OK)
                {
                    Task.Factory.StartNew(() =>
                    {
                        
                        {
                            string path = Path.GetDirectoryName(openFileDialog1.FileNames[0]) + \\NewImage\\;
                            if (!Directory.Exists(path))
                            {
                                Directory.CreateDirectory(path);
                            }
                            foreach (string file  Directory.GetFiles(path))
                            {
                                File.Delete(file);
                            }

                            int i = string fileName  openFileDialog1.FileNames)
                            {
                                Bitmap bmp = ZoomImageUtil.GetThumbnail(new Bitmap(fileName),Convert.ToInt32(txtWidth.Text == "" ? 0" : txtWidth.Text),Convert.ToInt32(txtHeight.Text ==  : txtHeight.Text));

                                this.Invoke(new InvokeDelegate(() =>
                                {
                                    if (cbxExt.SelectedItem == )
                                    {
                                        bmp.Save(path + Path.GetFileName(fileName));
                                    }
                                    
                                    {
                                        bmp.Save(path + Path.GetFileNameWithoutExtension(fileName) + (string)cbxExt.SelectedItem);
                                    }
                                }));
                                
                                {
                                    lblProgress.Text = string.Format(进度：{1}/{0}",openFileDialog1.FileNames.Length,++i);
                                }));
                                Thread.Sleep();
                            }

                            MessageBox.Show(成功！);
                        }
                        catch (Exception ex)
                        {
                            MessageBox.Show(ex.Message);
                        }
                    });
                }
            }
             (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

    }

     跨线程访问控件的委托
    delegate void InvokeDelegate();
}
View Code

 

C#图片按比例缩放实例

C#图片按比例缩放实例

本文实例为大家分享了C#图片按比例缩放的具体代码，供大家参考，具体内容如下

工具类代码：

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.drawing2d;
using System.Drawing.Imaging;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ZoomImage.Utils
{
 /// <summary>
 /// 图片缩放
 /// </summary>
 public class ZoomImageUtil
 {
  /// <summary>
  /// 图片缩放
  /// </summary>
  /// <param name="bmp">图片</param>
  /// <param name="width">目标宽度，若为0，表示宽度按比例缩放</param>
  /// <param name="height">目标长度，若为0，表示长度按比例缩放</param>
  public static Bitmap GetThumbnail(Bitmap bmp,int width,int height)
  {
   if (width == 0)
   {
    width = height * bmp.Width / bmp.Height;
   }
   if (height == 0)
   {
    height = width * bmp.Height / bmp.Width;
   }

   Image imgSource = bmp;
   Bitmap outBmp = new Bitmap(width,height);
   Graphics g = Graphics.FromImage(outBmp);
   g.Clear(Color.Transparent);
   // 设置画布的描绘质量   
   g.CompositingQuality = CompositingQuality.HighQuality;
   g.SmoothingMode = SmoothingMode.HighQuality;
   g.InterpolationMode = InterpolationMode.HighQualityBicubic;
   g.DrawImage(imgSource,new Rectangle(0,width,height + 1),imgSource.Width,imgSource.Height,GraphicsUnit.Pixel);
   g.dispose();
   imgSource.dispose();
   bmp.dispose();
   return outBmp;
  }
 }
}

使用示例：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;
using ZoomImage.Utils;

namespace ZoomImage
{
 public partial class Form1 : Form
 {
  public Form1()
  {
   InitializeComponent();
  }

  private void Form1_Load(object sender,EventArgs e)
  {
   openFileDialog1.Multiselect = true;
  }

  private void txtWidth_KeyPress(object sender,KeyPressEventArgs e)
  {
   if (e.KeyChar != 8 && !Char.IsDigit(e.KeyChar))
   {
    e.Handled = true;
   }
  }

  private void txtHeight_KeyPress(object sender,KeyPressEventArgs e)
  {
   if (e.KeyChar != 8 && !Char.IsDigit(e.KeyChar))
   {
    e.Handled = true;
   }
  }

  private void btnSelectimage_Click(object sender,EventArgs e)
  {
   try
   {
    if (txtWidth.Text == "" && txtHeight.Text == "")
    {
     return;
    }

    if (openFileDialog1.ShowDialog() == DialogResult.OK)
    {
     Task.Factory.StartNew(() =>
     {
      string path = Path.GetDirectoryName(openFileDialog1.FileNames[0]) + "\\NewImage\\";

      int i = 0;
      foreach (string fileName in openFileDialog1.FileNames)
      {
       Bitmap bmp = ZoomImageUtil.GetThumbnail(new Bitmap(fileName),Convert.ToInt32(txtWidth.Text == "" ? "0" : txtWidth.Text),Convert.ToInt32(txtHeight.Text == "" ? "0" : txtHeight.Text));
       if (!Directory.Exists(path))
       {
        Directory.CreateDirectory(path);
       }
       File.Delete(path + Path.GetFileName(fileName));
       bmp.Save(path + Path.GetFileName(fileName));
       this.Invoke(new InvokeDelegate(() =>
       {
        lblProgress.Text = string.Format("进度：{1}/{0}",openFileDialog1.FileNames.Length,++i);
       }));
       Thread.Sleep(1);
      }

      MessageBox.Show("成功！");
     });
    }
   }
   catch (Exception ex)
   {
    MessageBox.Show(ex.Message);
   }
  }

 }

 /// <summary>
 /// 跨线程访问控件的委托
 /// </summary>
 public delegate void InvokeDelegate();
}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持编程小技巧。

C#图片按比例缩放的示例代码分享

C#图片按比例缩放的示例代码分享

这篇文章主要为大家详细介绍了c#图片按比例缩放的实例，具有一定的参考价值，感兴趣的小伙伴们可以参考一下

本文实例为大家分享了C#图片按比例缩放的具体代码，供大家参考，具体内容如下

工具类代码：


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

namespace ZoomImage.Utils
{
 /// <summary>
 /// 图片缩放
 /// </summary>
 public class ZoomImageUtil
 {
  /// <summary>
  /// 图片缩放
  /// </summary>
  /// <param name="bmp">图片</param>
  /// <param name="width">目标宽度，若为0，表示宽度按比例缩放</param>
  /// <param name="height">目标长度，若为0，表示长度按比例缩放</param>
  public static Bitmap GetThumbnail(Bitmap bmp, int width, int height)
  {
   if (width == 0)
   {
    width = height * bmp.Width / bmp.Height;
   }
   if (height == 0)
   {
    height = width * bmp.Height / bmp.Width;
   }

   Image imgSource = bmp;
   Bitmap outBmp = new Bitmap(width, height);
   Graphics g = Graphics.FromImage(outBmp);
   g.Clear(Color.Transparent);
   // 设置画布的描绘质量   
   g.CompositingQuality = CompositingQuality.HighQuality;
   g.SmoothingMode = SmoothingMode.HighQuality;
   g.InterpolationMode = InterpolationMode.HighQualityBicubic;
   g.DrawImage(imgSource, new Rectangle(0, 0, width, height + 1), 0, 0, imgSource.Width, imgSource.Height, GraphicsUnit.Pixel);
   g.Dispose();
   imgSource.Dispose();
   bmp.Dispose();
   return outBmp;
  }
 }
}
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使用示例：


using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;
using ZoomImage.Utils;

namespace ZoomImage
{
 public partial class Form1 : Form
 {
  public Form1()
  {
   InitializeComponent();
  }

  private void Form1_Load(object sender, EventArgs e)
  {
   openFileDialog1.Multiselect = true;
  }

  private void txtWidth_KeyPress(object sender, KeyPressEventArgs e)
  {
   if (e.KeyChar != 8 && !Char.IsDigit(e.KeyChar))
   {
    e.Handled = true;
   }
  }

  private void txtHeight_KeyPress(object sender, KeyPressEventArgs e)
  {
   if (e.KeyChar != 8 && !Char.IsDigit(e.KeyChar))
   {
    e.Handled = true;
   }
  }

  private void btnSelectImage_Click(object sender, EventArgs e)
  {
   try
   {
    if (txtWidth.Text == "" && txtHeight.Text == "")
    {
     return;
    }

    if (openFileDialog1.ShowDialog() == DialogResult.OK)
    {
     Task.Factory.StartNew(() =>
     {
      string path = Path.GetDirectoryName(openFileDialog1.FileNames[0]) + "\\NewImage\\";

      int i = 0;
      foreach (string fileName in openFileDialog1.FileNames)
      {
       Bitmap bmp = ZoomImageUtil.GetThumbnail(new Bitmap(fileName), Convert.ToInt32(txtWidth.Text == "" ? "0" : txtWidth.Text), 
       Convert.ToInt32(txtHeight.Text == "" ? "0" : txtHeight.Text));
       if (!Directory.Exists(path))
       {
        Directory.CreateDirectory(path);
       }
       File.Delete(path + Path.GetFileName(fileName));
       bmp.Save(path + Path.GetFileName(fileName));
       this.Invoke(new InvokeDelegate(() =>
       {
        lblProgress.Text = string.Format("进度：{1}/{0}", openFileDialog1.FileNames.Length, ++i);
       }));
       Thread.Sleep(1);
      }

      MessageBox.Show("成功！");
     });
    }
   }
   catch (Exception ex)
   {
    MessageBox.Show(ex.Message);
   }
  }

 }

 /// <summary>
 /// 跨线程访问控件的委托
 /// </summary>
 public delegate void InvokeDelegate();
}
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