Top "Alpha" questions

colorWithAlphaComponent example in Swift

What is the correct syntax for this function in Swift? The following works fine, and colors the background purple: self.…

ios swift alpha uicolor

Adjust alpha of UIColor

I set a UIColor using rgb to a background of a UILabel. I'm trying to adjust the alpha only. How …

ios objective-c alpha uicolor

JPEG image with alpha channel on website

I would like to make a JPEG image file with some pixels that are partially transparent or fully transparent, similar …

transparency jpeg opacity alpha

Loading PNG with stb_image for OpenGL texture gives wrong colors

I am using stb_image to load a 32-bit PNG file (RGBA) and I am creating an OpenGL texture with …

c++ opengl png textures alpha

animation alpha change

I've always worked with Flash, and it's pretty easy to change the alpha values between one frame and another. Is …

objective-c ios animation png alpha

PIL: Thumbnail and end up with a square image

Calling image = Image.open(data) image.thumbnail((36,36), Image.NEAREST) will maintain the aspect ratio. But I need to end up …

python png thumbnails python-imaging-library alpha

PyGame: Applying transparency to an image with alpha?

I want to display an image with alpha with a specified transparency, but can't figure out how to do it. …

python pygame alpha geometry-surface blit

Is the opacity and alpha the same thing for UIView

I want to use animation to change UIView's color to make it fade, however, somehow i can't access and set …

ios objective-c xcode opacity alpha

How do you draw transparent polygons with Python?

I'm using PIL (Python Imaging Library). I'd like to draw transparent polygons. It seems that specifying a fill color that …

python-imaging-library polygon alpha

Individual alpha values in scatter plot

I'm wondering if it is possible to have individual alpha values for each point to be plotted using the scatter …

python matplotlib alpha scatter-plot