alpha-transparency

Is it possible to assign an alpha-transparent mask to a QWidget? I know how to set a mask using setMask but it seems it only supports black&white masks. Is it possible to make it support a true alpha channel? i.e. currently I have a PNG like this: and a widget like this: If I load my PNG in a QPixmap and set it as a mask, I get this (notice the edges): However I would like to get this (smooth edges): Any idea how to do that? Note: I'm doing some more complex drawing on the widget, which must be restricted to the mask area, so I cannot simply set my PNG as the widget's background image. sam-w I

I have a 35x40 px. png image I want to use as a custom cursor in a Swing application. The image has a glow so contains alpha transparency values. Problem is when I attempt to use the conventional method of using the Toolkit to generate the custom cursor I get black pixels where alpha transparency values should be. Here is the image I am using for a cursor: https://dl.dropbox.com/u/1186703/cursor.png Here is my code: public static void main(String[] args) throws IOException { new Sandbox().gui(); } private Cursor cursor; private Toolkit kit; private Image cursorImage; public void gui() { kit =

I have a quick question for someone who knows the Python Image Library better than I do. I have a png image with an alpha-channel, and I want the top two rows of pixels to be completely transparent. That's it! So far, my efforts make the top two rows transparent, but the original image loses it's alpha-channel information. Anyone know the best way to achieve this? You can do this way. img = Image.open("withAlpha.png") p = img.load() for y in range(2): for x in range(img.size[0]): t = list(p[x,y]) t[3] = 0 p[x,y] = tuple(t) img.save("result.png") I would do it the following way: img = Image

background i have a master bitmap that i need to draw on it other bitmaps. the master bitmap has some semi-transparent pixels (pixels with variant values for the alpha channel) , so that the other bitmaps that are drawn on it should be merged with it instead of overriding the colors completely. the question how can i set the canvas to draw the bitmaps on the master bitmap with respect to the semi-transparent pixels ? note: the alpha is not for the whole bitmap/s . it's per pixel. Canvas.setXfermode(Xfermode xfermode) . There are a number of Xfermode s you can choose. Desmond Yao public void

Code : private void Foo(Canvas canvas) { // The content is a bit larger... Size size = new Size(canvas.ActualWidth * 1.1, canvas.ActualHeight * 1.2); // Create a render bitmap and push the surface to it RenderTargetBitmap renderBitmap = new RenderTargetBitmap( (int)size.Width, (int)size.Height, 96d, 96d, PixelFormats.Pbgra32 ); renderBitmap.Render(canvas); // Then copy to clipboard Clipboard.SetImage(renderBitmap); } What I need : Render a canvas with transparent background to image, then copy it to clipboard (Quit simple? Not really) Problem : When paste, I get a ugly image with black