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Originally Posted by Kaimetsu
Dude, bear in mind that the images have to be stored in a texture buffer before they can be drawn to the screen, and the pixelformat used in that buffer doesn't depend on the format of the image file. It's probably already at least 24 bits large, it ain't gonna get any bigger just because you use a certain type of file format.
About the only real argument that can be made against high-color image files is that they're generally bigger, and thus take longer to read/decode. But that's a pretty marginal effect.
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I'm not going to pretend to know too much about this, but I know this - if you have a high-bit image and you save it as a 8-Bit PNG, for example, it will change the colors to the most relative other... limiting the colors.
So if I take an image that doesn't exactley need to be a 24-bit, but it using full 24-bit color then save it as 24-bit it's going to use all the colors - when it could have been saved as a 8-bit so that the colors limit is lower, and less information needs to be processed... right?