alpha

I am trying to scale down a Bitmap that contains transparency. Unfortunately, all three methods I've tried result in white where there should be full transparency. I would like to maintain the transparency. The bitmap I am scaling is always square, so my functions assume that: private static Bitmap scale1(int edge, final Bitmap res) { int factor = edge == 0 ? Fixed32.ONE : Fixed32.div(res.getHeight(), edge); Bitmap scaled = PNGEncodedImage.encode(res). scaleImage32(factor, factor).getBitmap(); return scaled; } private static Bitmap scale2(int edge, final Bitmap res) { Bitmap val = new Bitmap

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I want to make something like this python. I have the image in background and write text with transparent fill, so that image shows up. Here's one way I found to do it using the Image.composite() function which is documented here and here . The approach used is described (very) tersely in this answer to the question Is it possible to mask an image in Python Imaging Library (PIL)? by @Mark Ransom…the following is just an illustration of applying it to accomplish what you want do. from PIL import Image, ImageDraw, ImageFont BACKGROUND_IMAGE_FILENAME = 'cookie_cutter_background_cropped.png'

I have a problem with transparency in my project. As you can see, the transparency is working fine for other objects - you can see the rhino behind leaves, BUT the problem is with the tree itself. When there are two branches and one is closer than the other, the further one is not visible. Same with the trunk. The transparency is just not working for the object itself. This is the code I use when creating texture: glEnable(GL_BLEND); glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); glGenTextures(1, &m_texture); glBindTexture(GL_TEXTURE_2D, m_texture); glTexParameteri(GL_TEXTURE_2D, GL

I have an image with a transparent background, but when I open it in MATLAB, I get a black background. I'm overlaying it on top of a background image. How can I get this to display? I've tried using the alpha function alpha(image,0) but it sets my entire image to 0. Is it possible for me to set the alpha of individual pixels to be equal to 0? That way I can run each pixel through a loop. I'm not sure if this helps, but when I run a imfinfo('ryu1.png') , I get : ... Transparency = 'alpha' SimpleTransparencyData = [] ... rayryeng You can read in your image using imread . However, you need to

Is there a way in ggplot2 to produce a geom_ribbon (or other area based geom) with a varying alpha based on the density of points? The following code produces 50 noisy sine waves, with random x-values for each sample. I don't want to draw every single point as I might want a thousand or more resamples, so I'd like to summarise all these points. A simple method would be to draw a geom_ribbon covering 95% quantiles. However, firstly this isn't that easy to calculate given the x-values aren't the same for each resample; normally you'd calculate the pointwise quantiles at each of the 100 x points.

All, I have a need to display information on a MapView object. No problems there. The issue is that there are times when the MapView object displays map details that visually compete with my overlay data. So, what I'd like to do is provide a way to "scale back" the MapView object visually by using an alpha channel. Can an alpha value get applied to a MapView object? If so, how? Alternatively, I was thinking that perhaps a separate all black overlay might provide the same results. Scale the alpha of this overlay and I might end up with the same overall effect. Insight please. Thanks. Rich Are