C#圖片切割、圖片壓縮、縮略圖生成的實現代碼
/// 圖片切割函數
/// </summary>
/// <param name="sourceFile">原始圖片文件</param>
/// <param name="xNum">在Ｘ軸上的切割數量</param>
/// <param name="yNum">在Ｙ軸上的切割數量</param>
/// <param name="quality">質量壓縮比</param>
/// <param name="outputFile">輸出文件名，不帶后綴</param>
/// <returns>成功返回true，失敗則返回false</returns>
public
static
bool
imageCut(String sourceFile,
int
xNum,
int
yNum,
long
quality, String outputFile)
{
try
{
long
imageQuality = quality;
Bitmap sourceImage =
new
Bitmap(sourceFile);
ImageCodecInfo myImageCodecInfo = GetEncoderInfo(
"image/jpeg"
);
Encoder myEncoder = Encoder.Quality;
EncoderParameters myEncoderParameters =
new
EncoderParameters(1);
EncoderParameter myEncoderParameter =
new
EncoderParameter(myEncoder, imageQuality);
myEncoderParameters.Param[0] = myEncoderParameter;
float
xWidth = sourceImage.Width / xNum;
float
yWidth = sourceImage.Height / yNum;
String outputImage =
""
;
for
(
int
countY = 0; countY < yNum; countY++)
for
(
int
countX = 0; countX < xNum; countX++)
{
RectangleF cloneRect =
new
RectangleF(countX * xWidth, countY * yWidth, xWidth, yWidth);
Bitmap newImage = sourceImage.Clone(cloneRect, PixelFormat.Format24bppRgb);
outputImage = outputFile + countX + countY +
".jpg"
;
newImage.Save(outputImage, myImageCodecInfo, myEncoderParameters);
}
return
true
;
}
catch
{
return
false
;
}
}
#endregion imageCut
imageCompress
#region
imageCompress
/**/
/// <summary>
/// 圖片壓縮函數
/// </summary>
/// <param name="sourceFile">原始圖片文件</param>
/// <param name="quality">質量壓縮比</param>
/// <param name="ouputFile">輸出文件名,請用 .jpg 后綴 </param>
/// <returns>成功返回true，失敗則返回false</returns>
public
static
bool
imageCompress(String sourceFile,
long
quality,String outputFile)
{
try
{
long
imageQuality = quality;
Bitmap sourceImage =
new
Bitmap(sourceFile);
ImageCodecInfo myImageCodecInfo = GetEncoderInfo(
"image/jpeg"
);
Encoder myEncoder = Encoder.Quality;
EncoderParameters myEncoderParameters =
new
EncoderParameters(1);
EncoderParameter myEncoderParameter =
new
EncoderParameter(myEncoder, imageQuality);
myEncoderParameters.Param[0] = myEncoderParameter;
sourceImage.Save(outputFile, myImageCodecInfo, myEncoderParameters);
return
true
;
}
catch
{
return
false
;
}
}
#endregion imageCompress
getThumImage#region getThumImage
/**/
/// <summary>
/// 生成縮略圖
/// </summary>
/// <param name="sourceFile">原始圖片文件</param>
/// <param name="quality">質量壓縮比</param>
/// <param name="multiple">收縮倍數</param>
/// <param name="outputFile">輸出文件名</param>
/// <returns>成功返回true,失敗則返回false</returns>
public
static
bool
getThumImage(String sourceFile,
long
quality,
int
multiple, String outputFile)
{
try
{
long
imageQuality = quality;
Bitmap sourceImage =
new
Bitmap(sourceFile);
ImageCodecInfo myImageCodecInfo = GetEncoderInfo(
"image/jpeg"
);
Encoder myEncoder = Encoder.Quality;
EncoderParameters myEncoderParameters =
new
EncoderParameters(1);
EncoderParameter myEncoderParameter =
new
EncoderParameter(myEncoder, imageQuality);
myEncoderParameters.Param[0] = myEncoderParameter;
float
xWidth = sourceImage.Width;
float
yWidth = sourceImage.Height;
Bitmap newImage =
new
Bitmap((
int
)(xWidth /multiple), (
int
)(yWidth /multiple));
Graphics g = Graphics.FromImage(newImage);
g.DrawImage(sourceImage, 0, 0, xWidth / multiple, yWidth / multiple);
g.Dispose();
newImage.Save(outputFile,myImageCodecInfo,myEncoderParameters);
return
true
;
}
catch
{
return
false
;
}
}
#endregion getThumImage
ImageCodecInfo#region ImageCodecInfo
/**/
/// <summary>
/// 獲取圖片編碼信息
/// </summary>
private
static
ImageCodecInfo GetEncoderInfo(String mimeType)
{
int
j;
ImageCodecInfo[] encoders;
encoders = ImageCodecInfo.GetImageEncoders();
for
(j = 0; j < encoders.Length; ++j)
{
if
(encoders[j].MimeType == mimeType)
return
encoders[j];
}
return
null
;
}