看看下面的两张图片:
开发版本 - IIS7的Windows 7专业版64位机
真人版 - IIS7 Windows Server 2008的64位机
请注意如何在Live版本是pixelly&放大器;看起来低质量的,但是开发版本光滑,抗锯齿和放大器;看起来不错。这些都是由相同的code产生的:
Note how the Live Version is "pixelly" & looks low quality, the Dev Version however is smooth, anti-aliased & looks fine. These are both generated by identical code:
' Settings
Dim MaxHeight As Integer = 140
Dim MaxWidth As Integer = 140
Dim WorkingFolderPath As String = "\\server\share\bla\"
Dim AllowedFileExtensions As New ArrayList
AllowedFileExtensions.Add(".jpg")
AllowedFileExtensions.Add(".jpeg")
' Select an image to use from the WorkingFolder
Dim ImageFileName As String = ""
Dim WorkingFolder As New IO.DirectoryInfo(WorkingFolderPath)
Dim SourceImages As IO.FileInfo() = WorkingFolder.GetFiles()
For Each SourceImage As IO.FileInfo In SourceImages
If AllowedFileExtensions.Contains(SourceImage.Extension.ToLower) = True Then
ImageFileName = SourceImage.Name
End If
Next
' Determine path to selected image (if no image was found use a placeholder)
Dim PhysicalPath As String = ""
If ImageFileName = "" Then
' No Image was found, use the filler image
PhysicalPath = Server.MapPath("ProductOfTheMonthMissing.jpg")
Else
' An Image was found, Redirect to it / build path for Thumnailing
If Request.QueryString("FullSize") = "true" Then
Response.Redirect("../share/bla/" & ImageFileName)
Else
PhysicalPath = WorkingFolderPath & ImageFileName
End If
End If
' Load image and output in binary (resizing if necessary)
Using ProductImage As System.Drawing.Image = System.Drawing.Image.FromFile(PhysicalPath)
Dim newWidth As Integer = ProductImage.Width
Dim newHeight As Integer = ProductImage.Height
' Check if selected size is too big, if so, determine new size
If ProductImage.Width > MaxWidth Or ProductImage.Height > MaxHeight Then
Dim ratioX As Double = CDbl(MaxWidth) / ProductImage.Width
Dim ratioY As Double = CDbl(MaxHeight) / ProductImage.Height
Dim ratio As Double = Math.Min(ratioX, ratioY)
newWidth = CInt(ProductImage.Width * ratio)
newHeight = CInt(ProductImage.Height * ratio)
End If
' Create a new bitmap from the image with new size
Dim Codecs As ImageCodecInfo() = ImageCodecInfo.GetImageEncoders()
Dim CodecInfo As ImageCodecInfo = Nothing
Dim ProductOfTheMonth As New Bitmap(ProductImage, newWidth, newHeight)
Dim ReSizer As Graphics = Graphics.FromImage(ProductOfTheMonth)
ReSizer.InterpolationMode = InterpolationMode.HighQualityBicubic
ReSizer.SmoothingMode = SmoothingMode.HighQuality
ReSizer.PixelOffsetMode = PixelOffsetMode.HighQuality
ReSizer.CompositingQuality = CompositingQuality.HighQuality
' Ensure the encoder uses the best quality settings
Dim EncoderParams As New EncoderParameters(3)
EncoderParams.Param(0) = New EncoderParameter(System.Drawing.Imaging.Encoder.Quality, 100L)
EncoderParams.Param(1) = New EncoderParameter(System.Drawing.Imaging.Encoder.ScanMethod, CInt(EncoderValue.ScanMethodInterlaced))
EncoderParams.Param(2) = New EncoderParameter(System.Drawing.Imaging.Encoder.RenderMethod, CInt(EncoderValue.RenderProgressive))
' Set jpeg as the output codec
For Each Codec As ImageCodecInfo In Codecs
If Codec.MimeType = "image/jpeg" Then
CodecInfo = Codec
End If
Next
' Ready a memory stream and byte array
Dim MemStream As New MemoryStream()
Dim bmpBytes As Byte()
' Save the image the the memory stream & prep ContentType for HTTP reasponse
Response.ContentType = "image/jpeg"
ProductOfTheMonth.Save(MemStream, CodecInfo, EncoderParams)
' Flush memory stream into byte array & flush to browser
bmpBytes = MemStream.GetBuffer()
Response.BinaryWrite(bmpBytes)
' Cleanup
ProductOfTheMonth.Dispose()
MemStream.Close()
ProductImage.Dispose()
End Using
这背后与功放的原因;我该如何解决这一问题? presumably其现场Web服务器上的GD问题 - 但我不知道是什么? - 我试图将尽可能详细的设定图像和codeC设置,但它仍然是不同的。
What is the reason behind this & how do I address the issue? Presumably its a GD issue on the live web server - but I have no idea what - I tried to be as thorough as possible in setting graphic and codec settings but its still different?
编辑:源图像两个例子太(位于中央UNC共享)的相同 - 的源图像的这里
Source Image is identical in both examples too (Located on a central unc share) - copy of source image here
我已经和这里回答了类似的问题:Graphics在.net 错了图像插值,但在短期,好像不同的平台上使用不同的内部算法(或者是它在GDI内部四舍五入的问题)。
I've had and, answered a similar question here: Graphics wrong image interpolation in .Net, but in short it seems like different platforms use different internal algorithms (or perhaps it's an internal rounding problem in GDI).
反正,问题是在设置。因此,请尝试以下操作:
Anyway, the problem is in the settings. So try the following:
Using s As Bitmap = DirectCast(Bitmap.FromFile(PhysicalPath), Bitmap)
Dim scale As Double = Math.Min(140.0 / s.Width, 140.0 / s.Height)
Using d As New Bitmap(CInt(Math.Floor(scale * s.Width)), CInt(Math.Floor(scale * s.Height)), System.Drawing.Imaging.PixelFormat.Format24bppRgb)
Using dg As Graphics = Graphics.FromImage(d)
dg.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic
dg.SmoothingMode = SmoothingMode.HighQuality
dg.PixelOffsetMode = PixelOffsetMode.HighQuality
dg.CompositingQuality = CompositingQuality.HighQuality
dg.Clear(Color.White)
dg.DrawImage(s, New Rectangle(0, 0, d.Width, d.Height), New Rectangle(0, 0, s.Width, s.Height), GraphicsUnit.Pixel)
End Using
Dim jpegArgs As New EncoderParameters(3)
jpegArgs.Param(0) = New EncoderParameter(System.Drawing.Imaging.Encoder.Quality, 100L)
jpegArgs.Param(1) = New EncoderParameter(System.Drawing.Imaging.Encoder.ScanMethod, CInt(EncoderValue.ScanMethodInterlaced))
jpegArgs.Param(2) = New EncoderParameter(System.Drawing.Imaging.Encoder.RenderMethod, CInt(EncoderValue.RenderProgressive))
Dim Codecs As ImageCodecInfo() = ImageCodecInfo.GetImageEncoders()
Dim jpegParams As ImageCodecInfo = Nothing
'#### Set jpeg as the output codec
For Each Codec As ImageCodecInfo In Codecs
If Codec.MimeType = "image/jpeg" Then
jpegParams = Codec
End If
Next
Response.Clear()
Response.ContentType = "image/jpeg"
d.Save(Response.OutputStream, jpegParams, jpegArgs)
End Using
End Using
祝你好运!