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BytesIO replaces transparency in PNG files with black background


By : user2176068
Date : October 14 2020, 02:22 PM
I wish this help you I want to keep transparent background at my 'image' variable. , Two things...
code :
img = Image.open(ioFile)
img = Image.open(ioFile).convert('RGBA')
from PIL import Image

# Do OpenCV stuff
...
...

# Now make OpenCV array into Pillow Image and display
Image.fromarray(numpyImage).show()


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NSColor transparency on black background?


By : Tarik Zaimovic
Date : March 29 2020, 07:55 AM
I wish this helpful for you You're probably using the wrong compositing mode to draw the smaller box. Show us your code.

Rotating a div with png background using the filter:matrix method in IE turns transparency into black on background


By : user3508194
Date : March 29 2020, 07:55 AM

OpenGL transparency of black background


By : Eng Yeou Quan
Date : March 29 2020, 07:55 AM
I hope this helps you . OpenGL fixed-function pipeline has no builtin support for color keying. If you want to do it, you can write a shader to test the fragment's color and use the discard operation.
If you want to do this in fixed-function you'll have to properly use the alpha channel (make all the black area alpha = 0 in pre-processing).

Black background on GIF instead of transparency in PHP using imagegif()


By : Varun
Date : March 29 2020, 07:55 AM
it should still fix some issue imagecolortransparent($image, 127<<24); // 0x7f000000
The GD library stores the alpha in a weird way.

Scenekit transparency over black background


By : Feedback
Date : March 29 2020, 07:55 AM
Does that help I figured it out. I read here that scenekit assumes premultiplied alphas, so I added
code :
col.rgb *= col.a;
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