Top "Alpha" questions

An alpha channel determines the transparency of an image or view.

Texture and color together in GLSL?

I cant figure out, how to get with OpenGL ES 2.0 similiar Results to OpenGL ES 1.1. I want to use actually …

alpha opengl-es-2.0 blending fragment-shader
Core Animation is not working with "alpha" value

Before this code, my movie pic alpha is set to 0, CABasicAnimation* fadein= [CABasicAnimation animationWithKeyPath:@"alpha"]; [fadein setToValue:[NSNumber numberWithFloat:1.0]]; [fadein …

ios core-animation alpha cabasicanimation
AlphaAnimation does not work

I have been looking for a solution to my problem. But my code seems to be ok. I'll try to …

android animation alpha
Overlay two or more Bitmaps to show in Picturebox (C#)

In my C# program I have a Picturebox in which i want to show a stream of video (consecutive frames). …

c# bitmap picturebox alpha alphablending
what's the difference between view's hidden = yes and alpha = 0.0f

I have a question about UIView, what's the difference between views hidden, alpha and opaque? The effect of setting view: …

ios uiview hidden alpha
UIView alpha vs. UIColor alpha

I would like to know the difference between: Assigning my UIView a color with <1 alpha vs Assigning it a …

ios objective-c uiview transparency alpha
Transparent (alpha) gradient with Core Graphic iPhone

anyone knows how to programmatically create a transparent gradient (alpha gradient), over an image with Core Graphic? I need it …

ios core-graphics gradient alpha
ffmpeg: overlay a png image on a video with custom transparency?

Suppose I have a video foo.mkv and an image bar.png (which happens to contains an alpha channel). I …

video filter ffmpeg transparency alpha
iPhone Programming: Applying Alpha to Parent but not to Child Views

Is it possible to set Alpha to .75 or .50 (transparent) for Parent view but the Child views/controls are opaque (Alpha …

iphone uiview alpha
FFmpeg: Add alpha channel to a video using a PNG mask

I saw that FFmpeg can merge/blend two videos with alpha channel and can encode video with alpha channel using …

video filter ffmpeg alpha blend