This is for Pillow, a more maintained fork of PIL. http://pillow.readthedocs.org/ If you want to draw polygons that are transparent, relative to each other, the base Image has to be of type RGB, not RGBA, and the ImageDraw has to be of type RGBA. Example: from PIL import Image, ImageDraw img = Image.new(‘RGB’, (100, 100)) … Read more
Yes you can do this. The JPEG format makes provision for exchangeable image file format Color space definition Component sub-sampling registration Pixel aspect ratio definition JPEG/Exif is the most common for photography and JPEG/JFIF is the most commonly used for storage. When the others state JPEG format doesn’t provide for an alpha channel all they … Read more
have you glEnable’d alpha blending? And have you set up your blend parameters? You can’t just set the alpha you need to setup various other parameters in OpenGL. glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); glEnable( GL_BLEND );
One simpler way is also possible without making the views siblings. Don’t set the alpha directly on the parent view. Instead use [parentView setBackgroundColor:[[UIColor clearColor] colorWithAlphaComponent:0.5]]; Now any child view can have its own color and will NOT be transparent. In Swift, this would be parentView.backgroundColor = UIColor.clearColor().colorWithAlphaComponent(0.7)
[CABasicAnimation animationWithKeyPath:@”opacity”]; UIView exposes this as alpha where as CALayer exposes this as opacity.
The ImageMagik command: identify -format ‘%[channels]’ foo.png will print rgba or rgb if there is or is not an alpha channel, respectively. There could be an alpha channel present with no data in it which wouldn’t actually have any transparency, but that is a bit more complicated.
As far as I know, opacity or other color filters can’t be set on the Bitmap itself. You will need to set the alpha when you use the image: If you’re using ImageView, there is ImageView.setAlpha(). If you’re using a Canvas, then you need to use Paint.setAlpha(): Paint paint = new Paint(); paint.setAlpha(100); canvas.drawBitmap(bitmap, src, … Read more
The problem is in android:alpha=”0″. This property sets transparency of a View http://developer.android.com/reference/android/view/View.html#attr_android:alpha When alpha property is equal to 0 then animation is changing transparency from 0*0.0f=0 to 0*1.0f=0. When alpha property is set to 1 then animation is changing transparency from 1*0.0f=0 to 1*1.0f=1. That’s why in first case you can’t see text and … Read more
Ok Keep in mind these 2 points to solve this If I want to animate 1.0f to 0.0f after 5 seconds with an animation duration of 1 seconds, this is ultimately a 1 second animation with a pause of 5 seconds. To acheive this: setDuration(1000) (it has a 1 second duration) setStartOffset(5000) (it will start … Read more
There are several potential solutions to this: • adjusting your variable to use rgb values so you can easily add an alpha in CSS: :root { –blue: 0, 0, 255; } .blue-with-alpha{ color: rgba(var(–blue), 0.44); } • you could also add alpha as a variable: :root { –blue: 0, 0, 255; –alpha: .44; } .blue-with-alpha{ … Read more