PNG图片透明度处理，边角毛糙的问题，如何解决？

[wszhoho]

原始png图片：


程序透明处理掉Color.White的像素后的截图：


非常的毛糙，C#加AlphaBlend函数处理的，不知道一般是怎么做的，望指点一二，先谢过！！！

[qqlpp]

友情up

[pcjbird]

使用iimage com组件吧。。。

[pcjbird]

毛边是应为你图片本来就有毛边，只是原来的背景白色你都看不出来。

[wszhoho]

[Quote=引用 3 楼 pcjbird 的回复:]
毛边是应为你图片本来就有毛边，只是原来的背景白色你都看不出来。
[/Quote]
我用的是天气秀的图片文件，它显示出来的是没有毛边的。

[beyondma]

GDI出现这种情况很正常，用IIMAGE COM应该也不解决问题，两种方案一个是提高你图片的质量这个没的说，二是尽量画方形的PIC。WM上不像SYMBIAN不支持矢量图，这种问题没有办法。除非你改用DSHOW。

[pcjbird]

[Quote=引用 5 楼 BEYONDMA 的回复:]
GDI出现这种情况很正常，用IIMAGE COM应该也不解决问题，两种方案一个是提高你图片的质量这个没的说，二是尽量画方形的PIC。WM上不像SYMBIAN不支持矢量图，这种问题没有办法。除非你改用DSHOW。
[/Quote]


"用IIMAGE COM应该也不解决问题",你试过吗？肯定可以解决问题的。

[pcjbird]

放心吧，就你上面那个图片，我看了用IImage COM组件肯定可以的。。。。




这就是我用你那个图画出来的效果，SmartPhone的，PPC是一样的。。。。

[wszhoho]

啊！ 天啦，为什么我的不行？盼指教，谢谢了！！！！！

[pcjbird]

[Quote=引用 8 楼 wszhoho 的回复:]
啊！ 天啦，为什么我的不行？盼指教，谢谢了！！！！！
[/Quote]

不是告诉你用IImage COM组件了嘛。。。。。。。。。什么不行啊。。。。。不要用AlphaBlend。。。。

[wszhoho]

关键是c#，不知道如何使用这个东东，偶初学，也不知道要import哪个dll的哪个函数。

[pcjbird]

public enum PixelFormatID : int
    {
        PixelFormatIndexed = 0x00010000,  // Indexes into a palette
        PixelFormatGDI = 0x00020000,      // Is a GDI-supported format
        PixelFormatAlpha = 0x00040000,    // Has an alpha component
        PixelFormatPAlpha = 0x00080000,   // Pre-multiplied alpha
        PixelFormatExtended = 0x00100000, // Extended color 16 bits/channel
        PixelFormatCanonical = 0x00200000,
        PixelFormatUndefined = 0,
        PixelFormatDontCare = 0,
        PixelFormat1bppIndexed = (1 | (1 << 8) | PixelFormatIndexed | PixelFormatGDI),
        PixelFormat4bppIndexed = (2 | (4 << 8) | PixelFormatIndexed | PixelFormatGDI),
        PixelFormat8bppIndexed = (3 | (8 << 8) | PixelFormatIndexed | PixelFormatGDI),
        PixelFormat16bppRGB555 = (5 | (16 << 8) | PixelFormatGDI),
        PixelFormat16bppRGB565 = (6 | (16 << 8) | PixelFormatGDI),
        PixelFormat16bppARGB1555 = (7 | (16 << 8) | PixelFormatAlpha | PixelFormatGDI),
        PixelFormat24bppRGB = (8 | (24 << 8) | PixelFormatGDI),
        PixelFormat32bppRGB = (9 | (32 << 8) | PixelFormatGDI),
        PixelFormat32bppARGB = (10 | (32 << 8) | PixelFormatAlpha | PixelFormatGDI | PixelFormatCanonical),
        PixelFormat32bppPARGB = (11 | (32 << 8) | PixelFormatAlpha | PixelFormatPAlpha | PixelFormatGDI),
        PixelFormat48bppRGB = (12 | (48 << 8) | PixelFormatExtended),
        PixelFormat64bppARGB = (13 | (64 << 8) | PixelFormatAlpha | PixelFormatCanonical | PixelFormatExtended),
        PixelFormat64bppPARGB = (14 | (64 << 8) | PixelFormatAlpha | PixelFormatPAlpha | PixelFormatExtended),
        PixelFormatMax = 15
    }

    // Pulled from imaging.h in the Windows Mobile 5.0 Pocket PC SDK
    public enum BufferDisposalFlag : int
    {
        BufferDisposalFlagNone,
        BufferDisposalFlagGlobalFree,
        BufferDisposalFlagCoTaskMemFree,
        BufferDisposalFlagUnmapView
    }

    // Pulled from imaging.h in the Windows Mobile 5.0 Pocket PC SDK
    public enum InterpolationHint : int
    {
        InterpolationHintDefault,
        InterpolationHintNearestNeighbor,
        InterpolationHintBilinear,
        InterpolationHintAveraging,
        InterpolationHintBicubic
    }

    // Pulled from imaging.h in the Windows Mobile 5.0 Pocket PC SDK
    public struct ImageInfo
    {
        // I am being lazy here, I don't care at this point about the RawDataFormat GUID
        public uint GuidPart1;
        public uint GuidPart2;
        public uint GuidPart3;
        public uint GuidPart4;
        public PixelFormatID pixelFormat;
        public uint Width;
        public uint Height;
        public uint TileWidth;
        public uint TileHeight;
        public double Xdpi;
        public double Ydpi;
        public uint Flags;
    }

    // Pulled from imaging.h in the Windows Mobile 5.0 Pocket PC SDK
    [ComImport, Guid("327ABDA7-072B-11D3-9D7B-0000F81EF32E"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    [ComVisible(true)]
    public interface IImagingFactory
    {
        uint CreateImageFromStream(); // This is a place holder
        uint CreateImageFromFile(string filename, out IImage image);
        // We need the MarshalAs attribute here to keep COM interop from sending the buffer down as a Safe Array.
        uint CreateImageFromBuffer([MarshalAs(UnmanagedType.LPArray)] byte[] buffer, uint size, BufferDisposalFlag disposalFlag, out IImage image);
        uint CreateNewBitmap();            // This is a place holder
        uint CreateBitmapFromImage();      // This is a place holder
        uint CreateBitmapFromBuffer();     // This is a place holder
        uint CreateImageDecoder();         // This is a place holder
        uint CreateImageEncoderToStream(); // This is a place holder
        uint CreateImageEncoderToFile();   // This is a place holder
        uint GetInstalledDecoders();       // This is a place holder
        uint GetInstalledEncoders();       // This is a place holder
        uint InstallImageCodec();          // This is a place holder
        uint UninstallImageCodec();        // This is a place holder
    }

    // Pulled from imaging.h in the Windows Mobile 5.0 Pocket PC SDK
    [ComImport, Guid("327ABDA9-072B-11D3-9D7B-0000F81EF32E"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    [ComVisible(true)]
    public interface IImage
    {
        uint GetPhysicalDimension(out Size size);
        uint GetImageInfo(out ImageInfo info);
        uint SetImageFlags(uint flags);
        // "Correct" declaration: uint Draw(IntPtr hdc, ref Rectangle dstRect, ref Rectangle srcRect);
        uint Draw(IntPtr hdc, ref Rectangle dstRect, IntPtr NULL);
        uint PushIntoSink(); // This is a place holder
        uint GetThumbnail(uint thumbWidth, uint thumbHeight, out IImage thumbImage);
    }

IImage img;
/********************************************************************************************/
 string path = System.IO.Path.GetDirectoryName(Assembly.GetExecutingAssembly().GetName().CodeBase)+@"\images";
 // Load the image with alpha data through Imaging.
 IImagingFactory factory = (IImagingFactory)Activator.CreateInstance(Type.GetTypeFromCLSID(new Guid("327ABDA8-072B-11D3-9D7B-0000F81EF32E")));
  factory.CreateImageFromFile(path + @"\" + "XXX.png", out img);
/********************************************************************************************/

private void Form1_Paint(object sender, PaintEventArgs e)
{
   IntPtr dstHDC = e.Graphics.GetHdc();
   Rectangle rect = new Rectangle(0, 0, 140, 90);
   img.Draw(dstHDC, ref rect, IntPtr.Zero);
   e.Graphics.ReleaseHdc(dstHDC);
}

[wszhoho]

谢谢！ 突然发现OpenNETCF里居然有这个接口，不过这个更加的面向过程。

[itcoco]

学习

[chenhaohf]

把背景颜色改的反差大一点

imageAttr.SetColorKey(yourImg.GetPixel(0, 0), yourImg.GetPixel(0, 0))
g.DrawImage(yourImg, New Rectangle(0, 0, yourImg.Width, yourImg.tqImg.Height), 0, 0, yourImg.Width, yourImg.Height, GraphicsUnit.Pixel, imageAttr)