Top "Alpha" questions

iPhone: Changing CGImageAlphaInfo of CGImage

I have a PNG image that has an unsupported bitmap graphics context pixel format. Whenever I attempt to resize the …

iphone png alpha cgimage cgbitmapcontextcreate

CGBitmapContextCreate with kCGImageAlphaNone

I desperately need to create a CGContextRef WITHOUT an alpha channel. Unfortunately, with Core Graphics you CANNOT specify kCGImageAlphaNone with …

alpha cgbitmapcontextcreate

PNG Transparency on Canvas

Does canvas support PNG alpha? Im having some issues with a few PNGs that I've added to the canvas. The …

canvas png transparency alpha color-channel

Android doesn't animate alpha if it's initially zero

I am trying to animate alpha of an Android view (two animations, both fade in and fade out). It all …

android animation view android-animation alpha

Display PNG with alpha channel in C#

Is there a way to properly display an image with alpha channel (let's say PNG) in C# application? Thank you …

c# png transparency alpha

OpenGL ES 2.0 PNG alpha channel

I am just learning to work with OpenGL ES 2.0 for Android. I have been trying to simply display a texture …

android opengl-es png transparency alpha

How to implement alpha gradient on a image?

I want to implement alpha gradient on an image. From 0.5 alfa on top of the image to 0.0 on bottom. Any …

iphone ios gradient alpha quartz-2d

How to read the alpha channel of a TIFF image in Python OpenCV?

I want to read the alpha channel from a tiff image using Python OpenCV. I am using Enthought Canopy with …

python opencv alpha channel

Alpha transparency in indexed-png images

Here is an image: This image is a simple black-to-transparent gradient saved in full RGBA PNG. Here is the same …

image png alpha indexed

iOS controlling UIView alpha behaviour for subviews

In my example, I have 3 views: one red view containing two white views. I change the red container view's alpha …

ios uiview alpha