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  • 将图片生成高清缩略图

      '手动将image画到bitmap中
        Private Sub DrawThumbTest() 
    Dim str As String = "C:Usershd.songDesktop123.jpg"
            Dim array As ArrayList = New ArrayList()
            array.Add(PictureBox1)
            array.Add(PictureBox2)
            array.Add(PictureBox3)
            array.Add(PictureBox4)
            array.Add(PictureBox5)
            array.Add(PictureBox6)
            array.Add(PictureBox7)
            array.Add(PictureBox8)
            array.Add(PictureBox9)
            array.Add(PictureBox10)
            array.Add(PictureBox11)
            array.Add(PictureBox12)
            Dim img As Image = Image.FromFile("C:Usershd.songDesktopimg0.jpg")
            Dim thumbwidth As Integer = 132
            Dim srcWidth As Integer = img.Width
            Dim srcHeight As Integer = img.Height
            Dim thumbHeight As Integer = (srcHeight / srcWidth) * thumbwidth
            Dim bmp As Bitmap = New Bitmap(thumbwidth, thumbHeight)
            Dim g As Graphics = Graphics.FromImage(bmp)
            g.SmoothingMode = Drawing2D.SmoothingMode.HighQuality
            g.CompositingQuality = Drawing2D.CompositingQuality.HighQuality
            g.InterpolationMode = Drawing2D.InterpolationMode.High
            Dim rec As Rectangle = New Rectangle(0, 0, thumbwidth, thumbHeight)
            g.DrawImage(img, rec, 0, 0, srcWidth, srcHeight, GraphicsUnit.Pixel)
            For Each a As Object In array
                a.Image = bmp
            Next
            bmp.Save(str)
    End Sub

    图片所示使用系统的桌面生成缩略图

    '使用image的GetThumbnailImage自动获取缩略图
        Private Sub ThumbTest()
            Dim img As Image = Image.FromFile("C:Usershd.songDesktopimg0.jpg")
            Dim thumbwidth As Integer = 132
            Dim srcWidth As Integer = img.Width
            Dim srcHeight As Integer = img.Height
            Dim thumbHeight As Integer = (srcHeight / srcWidth) * thumbwidth
            Dim thumbnailimage As Image = img.GetThumbnailImage(thumbwidth, thumbHeight, Nothing, Nothing)
            Dim bitmap As Bitmap = New Bitmap(thumbnailimage)
            Dim g As Graphics = Graphics.FromImage(bitmap)
            g.SmoothingMode = Drawing2D.SmoothingMode.HighQuality
            g.CompositingQuality = Drawing2D.CompositingQuality.HighQuality
            g.InterpolationMode = Drawing2D.InterpolationMode.High
            g.DrawImage(thumbnailimage, 0, 0, thumbnailimage.Width, thumbnailimage.Height)
            PictureBox13.Image = bitmap
            PictureBox13.Refresh()
        End Sub

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  • 原文地址:https://www.cnblogs.com/hdsong/p/ThumbnailImage.html
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