Skystalker 2011-04-30 01:53 今天学习GDI的BITMAP贴图，用三种办法实现了指定颜色透明，总结如下 一、GDI下的方法，使用TransparentBlt，这是最麻烦的： CRect rc; GetDlgItem(IDC_STATIC_1)->GetWindowRect(&rc); ScreenToClient(&rc); CDC *pDC; pDC=GetDC(); CBitmap FootballBMP; FootballBMP.LoadBitmap(IDB_BITMAP1); CDC ImageDC; ImageDC.CreateCompatibleDC(pDC); CBitmap *pOldImageBMP = ImageDC.SelectObject(&FootballBMP); TransparentBlt(pDC->m_hDC, rc.left, rc.top, 300, 300, ImageDC.m_hDC, 0, 0, 300, 300, RGB(0xff,0xff,0)); 二、把图片需要透明的地方直接做成透明的，这样用draw出来就是透明的。 二、利用CImage类，但这样做其他操作比如旋转就比较困难： CDC *pDC; pDC=GetDC(); CImage myimage; myimage.Load(TEXT("Background.bmp")); myimage.TransparentBlt(pDC->m_hDC, rc.left, rc.top, 300, 300, RGB(0xff,0xff,0)); 三、利用ImageAttributes::SetColorKey 方法，但据说速度比较慢： MSDN的例子有说明： MSDN Library : Graphics and Multimedia / GDI+ / GDI+ Reference / Classed / Attributes / ImageAttributes Methods / SetColorKey VOID Example_SetColorKey(HDC hdc) { Graphics graphics(hdc); // Create an Image object based on a BMP file. // The image has three horizontal stripes. // The color of the top stripe has RGB components (90, 90, 20). // The color of the middle stripe has RGB components (150, 150, 150). // The color of the bottom stripe has RGB components (130, 130, 40). Image image(L "ColorKeyTest.bmp "); Image // Create an ImageAttributes object, and set its color key. ImageAttributes imAtt; imAtt.SetColorKey( Color(100, 95, 30), // 要透明的颜色范围高位 如果把高位和低位颜色设成一样 比如都是 255 255 0，那就把黄色透明 Color(250, 245, 60),// 要透明的颜色范围低位 ColorAdjustTypeBitmap); // Draw the image. Apply the color key. // The bottom stripe of the image will be transparent because // 100 <= 130 <= 250 and // 95 <= 130 <= 245 and // 30 <= 40 <= 60. graphics.DrawImage( &image, Rect(20, 20, image.GetWidth(), image.GetHeight()), // dest rect 0, 0, image.GetWidth(), image.GetHeight(), // source UnitPixel, &imAtt); } rect 本文来源：https://www.wddqw.com/doc/d24dfc8fa0116c175f0e489c.html