I have written a little utility class that is able to do exactly what you want: drop a standard shadow over a borderless Window but having AllowsTransparency set to false. You just have to call the DropShadowToWindow(Window window) method. It is preferred that you make this call just after the window’s constructor’s InitializeComponent(), but it … Read more
You can achieve a transparent cut out circle with 2 different techniques : 1.SVG The following examples use an inline svg. The first snippet uses the mask element to cut out the transparent circle and the second hollow circle is made with a path element. The circle is made with 2 arc commands : With … Read more
I like this Javascript solution writen by David Cilley some time ago. It gets out of the way of compliant browsers and can be used with any back-end you want. It does still require a blank gif image though. Add these functions to your HTML Header or other existing .js include: <script type=”text/javascript”> function fixPngs(){ … Read more
Add a new class to your project and post the code shown below. Build. Drop the new control from the top of the toolbox onto your form. using System; using System.Windows.Forms; public class TransparentLabel : Label { public TransparentLabel() { this.SetStyle(ControlStyles.Opaque, true); this.SetStyle(ControlStyles.OptimizedDoubleBuffer, false); } protected override CreateParams CreateParams { get { CreateParams parms = … Read more
I have had success doing it like this in the past: $thumb = imagecreatetruecolor($newwidth, $newheight); imagealphablending($thumb, false); imagesavealpha($thumb, true); $source = imagecreatefrompng($fileName); imagealphablending($source, true); imagecopyresampled($thumb, $source, 0, 0, 0, 0, $newwidth, $newheight, $width, $height); imagepng($thumb,$newFilename); I found the output image quality much better using imagecopyresampled() than imagecopyresized()
Use the matplotlib savefig function with the keyword argument transparent=True to save the image as a png file. In [30]: x = np.linspace(0,6,31) In [31]: y = np.exp(-0.5*x) * np.sin(x) In [32]: plot(x, y, ‘bo-‘) Out[32]: [<matplotlib.lines.Line2D at 0x3f29750>] In [33]: savefig(‘demo.png’, transparent=True) Result: Of course, that plot doesn’t demonstrate the transparency. Here’s a screenshot … Read more
You use an addtional attribute; fill-opacity: This attribute takes a decimal number between 0.0 and 1.0, inclusive; where 0.0 is completely transparent. For example: <rect … fill=”#044B94″ fill-opacity=”0.4″/> Additionally you have the following: stroke-opacity attribute for the stroke opacity for the entire object
I am also looking for an answer to this question, (to clarify, I want to be able to draw an image with user defined opacity such as how you can draw shapes with opacity) if you draw with primitive shapes you can set fill and stroke color with alpha to define the transparency. As far … Read more
If you want to overlay images over images (and not images over form), this would make the trick: overImage.Parent = backImage; overImage.BackColor = Color.Transparent; overImage.Location = thePointRelativeToTheBackImage; Where overImage and backImage are PictureBox with png (with transparent background). This is because, as said before, the transparency of an image is rendered using the back color … Read more
I was able to do exactly what I wanted by using the code from Part 1 and Part 2 of this series: Displaying a Splash Screen with C++ Part 1: Creating a HBITMAP archive Part 2: Displaying the window archive Those blog posts are talking about displaying a splash screen in Win32 C++, but it … Read more