保存为JPG格式比较清晰但保存为GIF后就不是很清晰了
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;用了以上语句,也没有任何改善,有什么办法吗?谢谢!
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;用了以上语句,也没有任何改善,有什么办法吗?谢谢!
{
//oldImagePath -原图地址 newImagePath 生成缩略图地址
int width = 150;//缩略图的宽度
int height = 112;// 缩略图的高度
int level = 100; //缩略图的质量 1-100的范围 System.Drawing.Image oldimage = System.Drawing.Image.FromFile(oldImagePath);
System.Drawing.Image thumbnailImage = oldimage.GetThumbnailImage(width, height,new System.Drawing.Image.GetThumbnailImageAbort(ThumbnailCallback), IntPtr.Zero);
Bitmap bm=new Bitmap(thumbnailImage); //处理JPG质量的函数
ImageCodecInfo[] codecs=ImageCodecInfo.GetImageEncoders();
ImageCodecInfo ici=null;
foreach(ImageCodecInfo codec in codecs)
{
if(codec.MimeType=="image/jpeg")
ici=codec;
}
EncoderParameters ep=new EncoderParameters();
ep.Param[0]=new EncoderParameter(Encoder.Quality,(long)level); bm.Save(newImagePath,ici,ep);
}VB.NET版本:Sub makeSLT(ByVal oldImagePath As String,ByVal newImagePath As String) Dim oimg As System.Drawing.Image = System.Drawing.Image.FromFile(oldImagePath)
Dim nimg As System.Drawing.Image = oimg.GetThumbnailImage(wids, heis, Nothing, IntPtr.Zero)
Response.Clear()
Dim outs As Bitmap = New Bitmap(nimg)
'处理图像质量
Dim codecs As ImageCodecInfo() = ImageCodecInfo.GetImageEncoders()
Dim ici As ImageCodecInfo ' = System.DBNull
For Each codec As ImageCodecInfo In codecs
If codec.MimeType = "image/jpeg" Then
ici = codec
End If
Next Dim ep As EncoderParameters = New EncoderParameters
ep.Param(0) = New EncoderParameter(System.Drawing.Imaging.Encoder.Quality, CLng(100))
outs.Save(newImagePath, ici, ep)End Sub
合成为3.gif但3.gif,比1.gif的效果差都是256色,但合成后效果就是差一些
两个gif要是每个都有256种颜色,合在一起就可能超过256种颜色了,保存为256色的gif肯定效果要差一些