/// <summary>
/// 指定位置裁剪图片
/// </summary>
/// <param name="imgStream">图片流</param>
/// <param name="x"></param>
/// <param name="y"></param>
/// <param name="x2"></param>
/// <param name="y2"></param>
/// <param name="quality">质量</param>
/// <param name="imgExt">图片后缀</param>
/// <returns></returns>
public static MemoryStream CutImg(System.IO.Stream imgStream, int x, int y, int x2, int y2, int quality, string imgExt)
{
//原始图片（获取原始图片创建对象，并使用流中嵌入的颜色管理信息）
System.Drawing.Image initImage = System.Drawing.Image.FromStream(imgStream, true);
imgStream.Dispose();//释放资源
int width = x2 - x;
int height = y2 - y;
//截图对象
System.Drawing.Image pickedImage = new System.Drawing.Bitmap(width, height);
System.Drawing.Graphics pickedG = System.Drawing.Graphics.FromImage(pickedImage);
//设置质量
pickedG.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
pickedG.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
pickedG.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
//定位
Rectangle fromR = new Rectangle(x, y, width, height);
Rectangle toR = new Rectangle(0, 0, width, height);
//画图
pickedG.DrawImage(initImage, toR, fromR, System.Drawing.GraphicsUnit.Pixel);
//关键质量控制
ImageCodecInfo ici = SunImgFormat.GetImageCodecInfo(imgExt);
EncoderParameters ep = new EncoderParameters(1);
ep.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, (long)quality);
MemoryStream newMs = new MemoryStream();
//保存缩略图
pickedImage.Save(newMs, ici, ep);
//释放关键质量控制所用资源
ep.Dispose();
//释放原始图片资源
initImage.Dispose();
//释放截图资源
pickedG.Dispose();
pickedImage.Dispose();
return(newMs);
}
/// <summary>
/// 压缩图片质量
/// </summary>
/// <param name="sourceImg">图片流</param>
/// <param name="quality">图片质量</param>
///<param name="imgExt">图片后缀</param>
/// <returns></returns>
public static MemoryStream ImgReduce(System.IO.Stream sourceImg, int quality, string imgExt)
{
System.Drawing.Image iSource = System.Drawing.Image.FromStream(sourceImg);
sourceImg.Dispose();
MemoryStream newMs = new MemoryStream();
ImageFormat tFormat = iSource.RawFormat;
Bitmap ob = new Bitmap(iSource);;
//以下代码为保存图片时，设置压缩质量
EncoderParameters ep = new EncoderParameters();
EncoderParameter eParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, quality);
ep.Param[0] = eParam;
try
{
ImageCodecInfo codeinfo = SunImgFormat.GetImageCodecInfo(imgExt);
if (codeinfo != null)
{
ob.Save(newMs, codeinfo, ep);
}
else
{
ob.Save(newMs, tFormat);
}
return(newMs);
}
catch (Exception e)
{
throw new Exception(e.Message);
}
finally
{
iSource.Dispose();
ob.Dispose();
ep.Dispose();
}
}
/// <summary>
/// 按原图片比例获取缩略图
/// </summary>
/// <param name="sourceImg"></param>
/// <param name="Width"></param>
/// <param name="quality"></param>
///<param name="imgExt">图片后缀</param>
/// <returns></returns>
public static MemoryStream GetImgThumbnail(System.IO.Stream sourceImg, int Width, int quality, string imgExt)
{
System.Drawing.Image iSource = System.Drawing.Image.FromStream(sourceImg);
sourceImg.Dispose();
MemoryStream newMs = new MemoryStream();
ImageFormat tFormat = iSource.RawFormat;
int sW = 0, sH = 0;
double srate = iSource.Width / (iSource.Height * 1.0);//原图宽高比例
int Height = Convert.ToInt32(Math.Floor(Width / srate));
//按比例缩放
Size tem_size = new Size(iSource.Width, iSource.Height);
if (tem_size.Width > Height || tem_size.Width > Width)
{
if ((tem_size.Width * Height) > (tem_size.Height * Width))
{
sW = Width;
sH = (Width * tem_size.Height) / tem_size.Width;
}
else
{
sH = Height;
sW = (tem_size.Width * Height) / tem_size.Height;
}
}
else
{
sW = tem_size.Width;
sH = tem_size.Height;
}
Bitmap ob = new Bitmap(Width, Height);
Graphics g = Graphics.FromImage(ob);
g.Clear(Color.WhiteSmoke);
g.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
g.DrawImage(iSource, new Rectangle((Width - sW) / 2 - 1, (Height - sH) / 2 - 1, sW + 2, sH + 1), 0, 0, iSource.Width, iSource.Height, GraphicsUnit.Pixel);
g.Dispose();
//以下代码为保存图片时，设置压缩质量
EncoderParameters ep = new EncoderParameters();
EncoderParameter eParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, quality);
ep.Param[0] = eParam;
try
{
ImageCodecInfo jpegICIinfo = SunImgFormat.GetImageCodecInfo(imgExt);
if (jpegICIinfo != null)
{
ob.Save(newMs, jpegICIinfo, ep);
}
else
{
ob.Save(newMs, tFormat);
}
return(newMs);
}
catch (Exception e)
{
throw new Exception(e.Message);
}
finally
{
iSource.Dispose();
ob.Dispose();
ep.Dispose();
}
}
/// <summary>
/// 正方型裁剪
/// 以图片中心为轴心，截取正方型，然后等比缩放
/// 用于头像处理
/// </summary>
/// <param name="fromFile">原图Stream对象</param>
/// <param name="side">指定的边长（正方型）</param>
/// <param name="quality">质量（范围0-100）</param>
///<param name="imgExt">图片后缀</param>
public static MemoryStream CutForSquare(System.IO.Stream fromFile, int side, int quality, string imgExt)
{
//原始图片（获取原始图片创建对象，并使用流中嵌入的颜色管理信息）
System.Drawing.Image initImage = System.Drawing.Image.FromStream(fromFile, true);
fromFile.Dispose();//释放资源
//原始图片的宽、高
int initWidth = initImage.Width;
int initHeight = initImage.Height;
//非正方型先裁剪为正方型
if (initWidth != initHeight)
{
//截图对象
System.Drawing.Image pickedImage = null;
System.Drawing.Graphics pickedG = null;
//宽大于高的横图
if (initWidth > initHeight)
{
//对象实例化
pickedImage = new System.Drawing.Bitmap(initHeight, initHeight);
pickedG = System.Drawing.Graphics.FromImage(pickedImage);
//设置质量
pickedG.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
pickedG.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
//定位
Rectangle fromR = new Rectangle((initWidth - initHeight) / 2, 0, initHeight, initHeight);
Rectangle toR = new Rectangle(0, 0, initHeight, initHeight);
//画图
pickedG.DrawImage(initImage, toR, fromR, System.Drawing.GraphicsUnit.Pixel);
//重置宽
initWidth = initHeight;
}
//高大于宽的竖图
else
{
//对象实例化
pickedImage = new System.Drawing.Bitmap(initWidth, initWidth);
pickedG = System.Drawing.Graphics.FromImage(pickedImage);
//设置质量
pickedG.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
pickedG.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
//定位
Rectangle fromR = new Rectangle(0, (initHeight - initWidth) / 2, initWidth, initWidth);
Rectangle toR = new Rectangle(0, 0, initWidth, initWidth);
//画图
pickedG.DrawImage(initImage, toR, fromR, System.Drawing.GraphicsUnit.Pixel);
//重置高
initHeight = initWidth;
}
//将截图对象赋给原图
initImage = (System.Drawing.Image)pickedImage.Clone();
//释放截图资源
pickedG.Dispose();
pickedImage.Dispose();
}
//缩略图对象
System.Drawing.Image resultImage = new System.Drawing.Bitmap(side, side);
System.Drawing.Graphics resultG = System.Drawing.Graphics.FromImage(resultImage);
//设置质量
resultG.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
resultG.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
//用指定背景色清空画布
resultG.Clear(Color.White);
//绘制缩略图
resultG.DrawImage(initImage, new System.Drawing.Rectangle(0, 0, side, side), new System.Drawing.Rectangle(0, 0, initWidth, initHeight), System.Drawing.GraphicsUnit.Pixel);
//关键质量控制
ImageCodecInfo ici = SunImgFormat.GetImageCodecInfo(imgExt);
EncoderParameters ep = new EncoderParameters(1);
ep.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, (long)quality);
MemoryStream newMs = new MemoryStream();
//保存缩略图
resultImage.Save(newMs, ici, ep);
//释放关键质量控制所用资源
ep.Dispose();
//释放缩略图资源
resultG.Dispose();
resultImage.Dispose();
//释放原始图片资源
initImage.Dispose();
return(newMs);
}
/// <summary>
/// 指定长宽裁剪缩放
/// 按模版比例最大范围的裁剪图片并缩放至模版尺寸
/// </summary>
/// <param name="fromFile">原图Stream对象</param>
/// <param name="maxWidth">最大宽(单位:px)</param>
/// <param name="maxHeight">最大高(单位:px)</param>
/// <param name="quality">质量（范围0-100）</param>
///<param name="imgExt">图片后缀</param>
public static MemoryStream CutForCustom(System.IO.Stream fromFile, int maxWidth, int maxHeight, int quality, string imgExt)
{
//从文件获取原始图片，并使用流中嵌入的颜色管理信息
System.Drawing.Image initImage = System.Drawing.Image.FromStream(fromFile, true);
ImageFormat tFormat = initImage.RawFormat;
MemoryStream newMS = new MemoryStream();
fromFile.Dispose();//释放资源
//模版的宽高比例
double templateRate = (double)maxWidth / maxHeight;
//原图片的宽高比例
double initRate = (double)initImage.Width / initImage.Height;
//原图与模版比例相等，直接缩放
if (templateRate == initRate)
{
//按模版大小生成最终图片
System.Drawing.Image templateImage = new System.Drawing.Bitmap(maxWidth, maxHeight);
System.Drawing.Graphics templateG = System.Drawing.Graphics.FromImage(templateImage);
templateG.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
templateG.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
templateG.Clear(Color.White);
templateG.DrawImage(initImage, new System.Drawing.Rectangle(0, 0, maxWidth, maxHeight), new System.Drawing.Rectangle(0, 0, initImage.Width, initImage.Height), System.Drawing.GraphicsUnit.Pixel);
templateImage.Save(newMS, tFormat);
return(newMS);
}
//原图与模版比例不等，裁剪后缩放
else
{
//裁剪对象
System.Drawing.Image pickedImage = null;
System.Drawing.Graphics pickedG = null;
//定位
Rectangle fromR = new Rectangle(0, 0, 0, 0); //原图裁剪定位
Rectangle toR = new Rectangle(0, 0, 0, 0); //目标定位
//宽为标准进行裁剪
if (templateRate > initRate)
{
//裁剪对象实例化
pickedImage = new System.Drawing.Bitmap(initImage.Width, (int)System.Math.Floor(initImage.Width / templateRate));
pickedG = System.Drawing.Graphics.FromImage(pickedImage);
//裁剪源定位
fromR.X = 0;
fromR.Y = (int)System.Math.Floor((initImage.Height - initImage.Width / templateRate) / 2);
fromR.Width = initImage.Width;
fromR.Height = (int)System.Math.Floor(initImage.Width / templateRate);
//裁剪目标定位
toR.X = 0;
toR.Y = 0;
toR.Width = initImage.Width;
toR.Height = (int)System.Math.Floor(initImage.Width / templateRate);
}
//高为标准进行裁剪
else
{
pickedImage = new System.Drawing.Bitmap((int)System.Math.Floor(initImage.Height * templateRate), initImage.Height);
pickedG = System.Drawing.Graphics.FromImage(pickedImage);
fromR.X = (int)System.Math.Floor((initImage.Width - initImage.Height * templateRate) / 2);
fromR.Y = 0;
fromR.Width = (int)System.Math.Floor(initImage.Height * templateRate);
fromR.Height = initImage.Height;
toR.X = 0;
toR.Y = 0;
toR.Width = (int)System.Math.Floor(initImage.Height * templateRate);
toR.Height = initImage.Height;
}
//设置质量
pickedG.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
pickedG.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
//裁剪
pickedG.DrawImage(initImage, toR, fromR, System.Drawing.GraphicsUnit.Pixel);
//按模版大小生成最终图片
System.Drawing.Image templateImage = new System.Drawing.Bitmap(maxWidth, maxHeight);
System.Drawing.Graphics templateG = System.Drawing.Graphics.FromImage(templateImage);
templateG.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
templateG.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
templateG.Clear(Color.White);
templateG.DrawImage(pickedImage, new System.Drawing.Rectangle(0, 0, maxWidth, maxHeight), new System.Drawing.Rectangle(0, 0, pickedImage.Width, pickedImage.Height), System.Drawing.GraphicsUnit.Pixel);
//关键质量控制
//获取系统编码类型数组,包含了jpeg,bmp,png,gif,tiff
ImageCodecInfo ici = SunImgFormat.GetImageCodecInfo(imgExt);
EncoderParameters ep = new EncoderParameters(1);
ep.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, (long)quality);
//保存缩略图
templateImage.Save(newMS, ici, ep);
//templateImage.Save(fileSaveUrl, System.Drawing.Imaging.ImageFormat.Jpeg);
//释放资源
ep.Dispose();
templateG.Dispose();
templateImage.Dispose();
pickedG.Dispose();
pickedImage.Dispose();
}
//释放资源
initImage.Dispose();
return(newMS);
}
/// <summary>
/// 加图片水印
/// </summary>
/// <param name="sourceImgMS">要加水印的原图(System.Drawing)</param>
/// <param name="watermarkImg">水印文件名</param>
/// <param name="watermarkStatus">图片水印位置1=左上 2=中上 3=右上 4=左中 5=中中 6=右中 7=左下 8=右中 9=右下</param>
/// <param name="quality">加水印后的质量0~100,数字越大质量越高</param>
/// <param name="watermarkTransparency">水印图片的透明度1~10,数字越小越透明,10为不透明</param>
///<param name="imgExt">图片后缀</param>
public static MemoryStream ImageWaterMarkPic(MemoryStream sourceImgMS, MemoryStream watermarkImg, int watermarkStatus, int quality, int watermarkTransparency, string imgExt)
{
Image sourceImg = Image.FromStream(sourceImgMS); //原图
Image watermark = Image.FromStream(watermarkImg); //水印图
ImageFormat tFormat = sourceImg.RawFormat; //获取原图格式
Graphics g = Graphics.FromImage(sourceImg);
//设置高质量插值法
//g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
//设置高质量,低速度呈现平滑程度
//g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
if (watermark.Height >= sourceImg.Height || watermark.Width >= sourceImg.Width)
{
throw new Exception("水印图片大于原图");
}
ImageAttributes imageAttributes = new ImageAttributes();
ColorMap colorMap = new ColorMap();
colorMap.OldColor = Color.FromArgb(255, 0, 255, 0);
colorMap.NewColor = Color.FromArgb(0, 0, 0, 0);
ColorMap[] remapTable = { colorMap };
imageAttributes.SetRemapTable(remapTable, ColorAdjustType.Bitmap);
float transparency = 0.5F;
if (watermarkTransparency >= 1 && watermarkTransparency <= 10)
{
transparency = (watermarkTransparency / 10.0F);
}
float[][] colorMatrixElements =
{
new float[] { 1.0f, 0.0f, 0.0f, 0.0f, 0.0f },
new float[] { 0.0f, 1.0f, 0.0f, 0.0f, 0.0f },
new float[] { 0.0f, 0.0f, 1.0f, 0.0f, 0.0f },
new float[] { 0.0f, 0.0f, 0.0f, transparency, 0.0f },
new float[] { 0.0f, 0.0f, 0.0f, 0.0f, 1.0f }
};
ColorMatrix colorMatrix = new ColorMatrix(colorMatrixElements);
imageAttributes.SetColorMatrix(colorMatrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap);
int xpos = 0;
int ypos = 0;
switch (watermarkStatus)
{
case 1:
xpos = (int)(sourceImg.Width * (float).01);
ypos = (int)(sourceImg.Height * (float).01);
break;
case 2:
xpos = (int)((sourceImg.Width * (float).50) - (watermark.Width / 2));
ypos = (int)(sourceImg.Height * (float).01);
break;
case 3:
xpos = (int)((sourceImg.Width * (float).99) - (watermark.Width));
ypos = (int)(sourceImg.Height * (float).01);
break;
case 4:
xpos = (int)(sourceImg.Width * (float).01);
ypos = (int)((sourceImg.Height * (float).50) - (watermark.Height / 2));
break;
case 5:
xpos = (int)((sourceImg.Width * (float).50) - (watermark.Width / 2));
ypos = (int)((sourceImg.Height * (float).50) - (watermark.Height / 2));
break;
case 6:
xpos = (int)((sourceImg.Width * (float).99) - (watermark.Width));
ypos = (int)((sourceImg.Height * (float).50) - (watermark.Height / 2));
break;
case 7:
xpos = (int)(sourceImg.Width * (float).01);
ypos = (int)((sourceImg.Height * (float).99) - watermark.Height);
break;
case 8:
xpos = (int)((sourceImg.Width * (float).50) - (watermark.Width / 2));
ypos = (int)((sourceImg.Height * (float).99) - watermark.Height);
break;
case 9:
xpos = (int)((sourceImg.Width * (float).99) - (watermark.Width));
ypos = (int)((sourceImg.Height * (float).99) - watermark.Height);
break;
}
g.DrawImage(watermark, new Rectangle(xpos, ypos, watermark.Width, watermark.Height), 0, 0, watermark.Width, watermark.Height, GraphicsUnit.Pixel, imageAttributes);
ImageCodecInfo ici = SunImgFormat.GetImageCodecInfo(imgExt);
EncoderParameters encoderParams = new EncoderParameters();
long[] qualityParam = new long[1];
if (quality < 0 || quality > 100)
{
quality = 80;
}
qualityParam[0] = quality;
EncoderParameter encoderParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, qualityParam);
encoderParams.Param[0] = encoderParam;
MemoryStream newMS = new MemoryStream();
if (ici != null)
{
sourceImg.Save(newMS, ici, encoderParams);
}
else
{
sourceImg.Save(newMS, tFormat);
}
watermarkImg.Dispose(); //释放资源
sourceImgMS.Dispose(); //释放资源
g.Dispose();
sourceImg.Dispose();
watermark.Dispose();
imageAttributes.Dispose();
return(newMS);
}
/// <summary>
/// 增加图片文字水印
/// </summary>
/// <param name="sourceImgMS">要加水印的原图(System.Drawing)</param>
/// <param name="watermarkText">水印文字</param>
/// <param name="watermarkStatus">图片水印位置1=左上 2=中上 3=右上 4=左中 5=中中 6=右中 7=左下 8=右中 9=右下</param>
/// <param name="quality">加水印后的质量0~100,数字越大质量越高</param>
/// <param name="fontname">水印的字体</param>
/// <param name="fontsize">水印的字号</param>
///<param name="imgExt">图片后缀</param>
public static MemoryStream ImageWaterMarkText(MemoryStream sourceImgMS, string watermarkText, int watermarkStatus, int quality, string fontname, int fontsize, Color color, string imgExt)
{
Image img = Image.FromStream(sourceImgMS);
ImageFormat sFormat = img.RawFormat;//获取原图格式
Graphics g = Graphics.FromImage(img);
Font drawFont = new Font(fontname, fontsize, FontStyle.Regular, GraphicsUnit.Pixel);
SizeF crSize;
crSize = g.MeasureString(watermarkText, drawFont);
float xpos = 0;
float ypos = 0;
switch (watermarkStatus)
{
case 1:
xpos = (float)img.Width * (float).01;
ypos = (float)img.Height * (float).01;
break;
case 2:
xpos = ((float)img.Width * (float).50) - (crSize.Width / 2);
ypos = (float)img.Height * (float).01;
break;
case 3:
xpos = ((float)img.Width * (float).99) - crSize.Width;
ypos = (float)img.Height * (float).01;
break;
case 4:
xpos = (float)img.Width * (float).01;
ypos = ((float)img.Height * (float).50) - (crSize.Height / 2);
break;
case 5:
xpos = ((float)img.Width * (float).50) - (crSize.Width / 2);
ypos = ((float)img.Height * (float).50) - (crSize.Height / 2);
break;
case 6:
xpos = ((float)img.Width * (float).99) - crSize.Width;
ypos = ((float)img.Height * (float).50) - (crSize.Height / 2);
break;
case 7:
xpos = (float)img.Width * (float).01;
ypos = ((float)img.Height * (float).99) - crSize.Height;
break;
case 8:
xpos = ((float)img.Width * (float).50) - (crSize.Width / 2);
ypos = ((float)img.Height * (float).99) - crSize.Height;
break;
case 9:
xpos = ((float)img.Width * (float).99) - crSize.Width;
ypos = ((float)img.Height * (float).99) - crSize.Height;
break;
}
//g.DrawString(watermarkText, drawFont, new SolidBrush(Color.White), xpos + 1, ypos + 1);文字阴影
g.DrawString(watermarkText, drawFont, new SolidBrush(color), xpos, ypos);
ImageCodecInfo ici = SunImgFormat.GetImageCodecInfo(imgExt);
EncoderParameters encoderParams = new EncoderParameters();
long[] qualityParam = new long[1];
if (quality < 0 || quality > 100)
{
quality = 80;
}
qualityParam[0] = quality;
EncoderParameter encoderParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, qualityParam);
encoderParams.Param[0] = encoderParam;
MemoryStream newMs = new MemoryStream();
if (ici != null)
{
img.Save(newMs, ici, encoderParams);
}
else
{
img.Save(newMs, sFormat);
}
sourceImgMS.Dispose();
g.Dispose();
img.Dispose();
return(newMs);
}