创建缩略图和缩小图像尺寸 [英] Create thumbnail and reduce image size
本文介绍了创建缩略图和缩小图像尺寸的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我有非常大的图片(JPG格式),我想通过文件到CSHARP程序写入循环,并减少75%的每个图像的大小。
我想这样的:
图像缩略图= image.GetThumbnailImage(800,600,空,新的IntPtr());
但文件大小还是非常大的。
反正是有创建缩略图,并有文件大小小很多?
解决方案
私人无效CompressAndSaveImage(图片IMG,字符串文件名,
长质量){
EncoderParameters参数=新EncoderParameters(1);
parameters.Param [0] =新EncoderParameter(Encoder.Quality,质量);
img.Save(文件名,GetCodecInfo(图像/ JPEG),参数);
}
私有静态ImageCodecInfo GetCodecInfo(字符串mime类型){
的foreach(ImageCodecInfo编码器ImageCodecInfo.GetImageEncoders())
如果(encoder.MimeType == mime类型)
回报率的编码器;
抛出新ArgumentOutOfRangeException(
的String.Format('{0}不支持,mime类型));
}
用法:
图像myImg = Image.FromFile(@C:\Test.jpg);
CompressAndSaveImage(myImg,@C:\Test2.jpg,10);
这将压缩test.jpg放在为10的质量,并保存为Test2.jpg。
编辑:可能是作为扩展方法更好:
私有静态无效SaveCompressed(此图片IMG,字符串文件名,
长质量){
EncoderParameters参数=新EncoderParameters(1);
parameters.Param [0] =新EncoderParameter(Encoder.Quality,质量);
img.Save(文件名,GetCodecInfo(图像/ JPEG),参数);
}
用法:
图像myImg = Image.FromFile(@C:\Test.jpg);
myImg.SaveCompressed(@C:\Test2.jpg,10);
I have very large images (jpg) and i want to write a csharp program to loop through the files and reduce the size of each image by 75%.
I tried this:
Image thumbNail = image.GetThumbnailImage(800, 600, null, new IntPtr());
but the file size is still very large.
Is there anyway to create thumbnails and have the filesize be much smaller?
解决方案
private void CompressAndSaveImage(Image img, string fileName,
long quality) {
EncoderParameters parameters = new EncoderParameters(1);
parameters.Param[0] = new EncoderParameter(Encoder.Quality, quality);
img.Save(fileName, GetCodecInfo("image/jpeg"), parameters);
}
private static ImageCodecInfo GetCodecInfo(string mimeType) {
foreach (ImageCodecInfo encoder in ImageCodecInfo.GetImageEncoders())
if (encoder.MimeType == mimeType)
return encoder;
throw new ArgumentOutOfRangeException(
string.Format("'{0}' not supported", mimeType));
}
Usage:
Image myImg = Image.FromFile(@"C:\Test.jpg");
CompressAndSaveImage(myImg, @"C:\Test2.jpg", 10);
That will compress Test.jpg with a quality of 10 and save it as Test2.jpg.
EDIT: Might be better as an extension method:
private static void SaveCompressed(this Image img, string fileName,
long quality) {
EncoderParameters parameters = new EncoderParameters(1);
parameters.Param[0] = new EncoderParameter(Encoder.Quality, quality);
img.Save(fileName, GetCodecInfo("image/jpeg"), parameters);
}
Usage:
Image myImg = Image.FromFile(@"C:\Test.jpg");
myImg.SaveCompressed(@"C:\Test2.jpg", 10);
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