14
votes
7answers
2k views

What does the term “channel” mean when used in regards to computer graphics?

I was studying terminology for computer graphics, and this statement came up that confused me. The image can have alpha channels for transparency. I tried searching for the meaning of the term ...
2
votes
1answer
204 views

When should I use color keying vs PNG transparency?

SDL (and other toolkits) can use color keying to make a certain color in an image transparent. Alternatively, you could load a PNG image that supports transparency. When should I use which?
0
votes
1answer
580 views

How do I programmatically remove an image's background color?

I have a sprite sheet (image) and want to draw it on screen. image = sprite sheet image x = player x position y = player y position width = player width height = player height public ...
1
vote
1answer
482 views

OpenGL ES Faces appear to be transparent when alpha is 1.0?

I am working on an object (OBJ File) loader for my app on iOS, currently I have successfully read the vertices and the faces of the object, and I am now just adding colours to the imported models. I ...