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C# 处理图片

2012-05-07 09:31 197 查看

今天的工作是把服务器上所有的电影封面图片稍微裁剪，适当缩放。贴下查资料和自己用到的代码~~

用到的一个枚举

enum AnchorPosition
{
Top,
Center,
Bottom,
Left,
Right
}

1、按比例缩放图小

static Image ScaleByPercent(Image imgPhoto, int Percent)
{
float nPercent = ((float)Percent/100);

int sourceWidth = imgPhoto.Width;
int sourceHeight = imgPhoto.Height;
int sourceX = 0;
int sourceY = 0;

int destX = 0;
int destY = 0;
int destWidth  = (int)(sourceWidth * nPercent);
int destHeight = (int)(sourceHeight * nPercent);

Bitmap bmPhoto = new Bitmap(destWidth, destHeight,
PixelFormat.Format24bppRgb);
bmPhoto.SetResolution(imgPhoto.HorizontalResolution,
imgPhoto.VerticalResolution);

Graphics grPhoto = Graphics.FromImage(bmPhoto);
grPhoto.InterpolationMode = InterpolationMode.HighQualityBicubic;

grPhoto.DrawImage(imgPhoto,
new Rectangle(destX,destY,destWidth,destHeight),
new Rectangle(sourceX,sourceY,sourceWidth,sourceHeight),
GraphicsUnit.Pixel);

grPhoto.Dispose();
return bmPhoto;
}

2、缩放到指定大小

static Image FixedSize(Image imgPhoto, int Width, int Height)
{
int sourceWidth = imgPhoto.Width;
int sourceHeight = imgPhoto.Height;
int sourceX = 0;
int sourceY = 0;
int destX = 0;
int destY = 0;

float nPercent = 0;
float nPercentW = 0;
float nPercentH = 0;

nPercentW = ((float)Width/(float)sourceWidth);
nPercentH = ((float)Height/(float)sourceHeight);
if(nPercentH < nPercentW)
{
nPercent = nPercentH;
destX = System.Convert.ToInt16((Width -
(sourceWidth * nPercent))/2);
}
else
{
nPercent = nPercentW;
destY = System.Convert.ToInt16((Height -
(sourceHeight * nPercent))/2);
}

int destWidth  = (int)(sourceWidth * nPercent);
int destHeight = (int)(sourceHeight * nPercent);

Bitmap bmPhoto = new Bitmap(Width, Height,
PixelFormat.Format24bppRgb);
bmPhoto.SetResolution(imgPhoto.HorizontalResolution,
imgPhoto.VerticalResolution);

Graphics grPhoto = Graphics.FromImage(bmPhoto);
grPhoto.Clear(Color.Red);
grPhoto.InterpolationMode =
InterpolationMode.HighQualityBicubic;

grPhoto.DrawImage(imgPhoto,
new Rectangle(destX,destY,destWidth,destHeight),
new Rectangle(sourceX,sourceY,sourceWidth,sourceHeight),
GraphicsUnit.Pixel);

grPhoto.Dispose();
return bmPhoto;
}

3、裁剪缩放

static Image Crop(Image imgPhoto, int Width,
int Height, AnchorPosition Anchor)
{
int sourceWidth = imgPhoto.Width;
int sourceHeight = imgPhoto.Height;
int sourceX = 0;
int sourceY = 0;
int destX = 0;
int destY = 0;

float nPercent = 0;
float nPercentW = 0;
float nPercentH = 0;

nPercentW = ((float)Width/(float)sourceWidth);
nPercentH = ((float)Height/(float)sourceHeight);

if(nPercentH < nPercentW)
{
nPercent = nPercentW;
switch(Anchor)
{
case AnchorPosition.Top:
destY = 0;
break;
case AnchorPosition.Bottom:
destY = (int)
(Height - (sourceHeight * nPercent));
break;
default:
destY = (int)
((Height - (sourceHeight * nPercent))/2);
break;
}
}
else
{
nPercent = nPercentH;
switch(Anchor)
{
case AnchorPosition.Left:
destX = 0;
break;
case AnchorPosition.Right:
destX = (int)
(Width - (sourceWidth * nPercent));
break;
default:
destX = (int)
((Width - (sourceWidth * nPercent))/2);
break;
}
}

int destWidth  = (int)(sourceWidth * nPercent);
int destHeight = (int)(sourceHeight * nPercent);

Bitmap bmPhoto = new Bitmap(Width,
Height, PixelFormat.Format24bppRgb);
bmPhoto.SetResolution(imgPhoto.HorizontalResolution,
imgPhoto.VerticalResolution);

Graphics grPhoto = Graphics.FromImage(bmPhoto);
grPhoto.InterpolationMode =
InterpolationMode.HighQualityBicubic;

grPhoto.DrawImage(imgPhoto,
new Rectangle(destX,destY,destWidth,destHeight),
new Rectangle(sourceX,sourceY,sourceWidth,sourceHeight),
GraphicsUnit.Pixel);

grPhoto.Dispose();
return bmPhoto;
}

4、四面裁剪图片

static Image CutABit(Image imgPhoto, int topToCut,
int bottomToCut, int lefToCut, int rightToCut)
{
int sourceWidth = imgPhoto.Width;
int sourceHeight = imgPhoto.Height;
int sourceX = 0;
int sourceY = 0;
int destX = 0;
int destY = 0;

Bitmap bmPhoto = new Bitmap(sourceWidth, sourceHeight - 60,
PixelFormat.Format24bppRgb);
bmPhoto.SetResolution(imgPhoto.HorizontalResolution,
imgPhoto.VerticalResolution);

Graphics grPhoto = Graphics.FromImage(bmPhoto);
grPhoto.InterpolationMode =
InterpolationMode.HighQualityBicubic;
grPhoto.DrawImage(imgPhoto,
new Rectangle(destX, destY,
sourceWidth - lefToCut  - rightToCut,
sourceHeight - topToCut - bottomToCut),
new Rectangle(sourceX + lefToCut, sourceY + topToCut,
sourceWidth - lefToCut - rightToCut,
sourceHeight - topToCut - bottomToCut),
GraphicsUnit.Pixel);

grPhoto.Dispose();
return bmPhoto;
}

5、忽略比列直接缩放

static Image Resize(Image imgPhoto, int Width, int Height)
{
int sourceWidth = imgPhoto.Width;
int sourceHeight = imgPhoto.Height;
int sourceX = 0;
int sourceY = 0;
int destX = 0;
int destY = 0;

Bitmap bmPhoto = new Bitmap(Width, Height, PixelFormat.Format24bppRgb);
bmPhoto.SetResolution(imgPhoto.HorizontalResolution, imgPhoto.VerticalResolution);

Graphics grPhoto = Graphics.FromImage(bmPhoto);
grPhoto.Clear(Color.White);
grPhoto.InterpolationMode = InterpolationMode.HighQualityBicubic;

grPhoto.DrawImage(imgPhoto,
new Rectangle(destX, destY, Width, Height),
new Rectangle(sourceX, sourceY, sourceWidth, sourceHeight),
GraphicsUnit.Pixel);

grPhoto.Dispose();
return bmPhoto;
}

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