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.net在IE和FF中生成损坏的JPEG

image .net

Vnuk · 技术社区 · 15 年前

这让我发疯了,所以。。。

将图像大小调整为小缩略图时,IE和FF无法完整显示生成的图像。Opera正确显示图像,windows图像预览也正确显示。

     final_image = New System.Drawing.Bitmap(92, 110)
     graphic = System.Drawing.Graphics.FromImage(final_image)
     graphic.FillRectangle(New System.Drawing.SolidBrush(System.Drawing.Color.White), New System.Drawing.Rectangle(0, 0, 92, 110))
     graphic.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic
     graphic.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality
     graphic.PixelOffsetMode = System.Drawing.Drawing2D.PixelOffsetMode.HighQuality
     graphic.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality
     graphic.DrawImage(original_image, 0, 0, 92, 110)

     Dim info() As Drawing.Imaging.ImageCodecInfo = Drawing.Imaging.ImageCodecInfo.GetImageEncoders()
     Dim encoderParameters As Drawing.Imaging.EncoderParameters
     encoderParameters = New Drawing.Imaging.EncoderParameters(1)
     encoderParameters.Param(0) = New Drawing.Imaging.EncoderParameter(Drawing.Imaging.Encoder.Quality, 100L)

结果是:

This image should be missing it's lower 1/6 in FF3 and IE6/7 http://incito.hr/e387103c-b12f-4324-ac2d-a836e65a6bad-92x110.jpg

如果您的浏览器正确显示上面的图像(来自FF3的屏幕截图):

Screen capture from FF3 http://incito.hr/Clipboard02.png

但是,如果我将缩略图大小增加到126x150-在所有浏览器中,一切正常:

Same image resized by the same code to 126x150 http://incito.hr/4d51a5cd-621e-4709-b24a-ebb8f9da54dd-126x150.jpg