.net – 以渐进格式保存JPG
发布时间:2020-12-14 21:16:12 所属栏目:资源 来源:网络整理
导读:Extension() _Public Sub Save(ByVal b As Bitmap,ByVal FileName As String,ByVal Compression As Long,ByVal MimeType As String) Dim Params As EncoderParameters = New EncoderParameters(2) Dim CodecInfo As ImageCodecInfo = GetEncoderInfo(MimeTyp
<Extension()> _ Public Sub Save(ByVal b As Bitmap,ByVal FileName As String,ByVal Compression As Long,ByVal MimeType As String) Dim Params As EncoderParameters = New EncoderParameters(2) Dim CodecInfo As ImageCodecInfo = GetEncoderInfo(MimeType) Params.Param(0) = New EncoderParameter(Encoder.RenderMethod,EncoderValue.RenderProgressive) Params.Param(1) = New EncoderParameter(Encoder.Quality,Compression) b.Save(FileName,CodecInfo,Params) End Sub 这不起作用.它没有被保存为渐进式.我怎么能这样做,也可以指定通行证的数量. 解决方法
据我所知,它不受支持.我尝试过建议
here和
here的代码,并得到了这个C#代码:
using (Image source = Image.FromFile(@"D:temptest2.jpg")) { ImageCodecInfo codec = ImageCodecInfo.GetImageEncoders().First(c => c.MimeType == "image/jpeg"); EncoderParameters parameters = new EncoderParameters(3); parameters.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality,100L); parameters.Param[1] = new EncoderParameter(System.Drawing.Imaging.Encoder.ScanMethod,(int)EncoderValue.ScanMethodInterlaced); parameters.Param[2] = new EncoderParameter(System.Drawing.Imaging.Encoder.RenderMethod,(int)EncoderValue.RenderProgressive); source.Save(@"D:tempsaved.jpg",codec,parameters); } 设置隔行和逐行模式,它仍然保存常规基线JPEG.我尝试了任何设置和其他设置(非隔行扫描和非渐进式)的任意组合,并且在生成的图像文件中根本没有看到任何差异. 我没有发现任何人说他们实际上已经设法在.NET中保存渐进式JPEG的任何回复. ScanMethodInterlaced和RenderProgressive参数值仅描述为“未在GDI版本1.0中使用”.在 the documentation. (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |