JPG isn't good, we use it sometime, but because this extension will cause artifact due to it's compression method. We can't separate the alpha to another files, since it will take another whole RGB image just to store one grayscale information, which will affect the game's build size a lot. Me and my team has tried png before, and had to switched to tga because of this problem. and with the png method it may mess the other channels up.Īnd because of how the Photoshop treats the tga alpha information as separate layer, not as 3 RGB channels with transparency, we're still using this file extension in game making. We used the the TGA to create a special material texture in realistic game nowadays, we use each R.G.B.A channel to store grayscale values to express information like smoothness, reflection, ambient occlusion, glowness, etc. If we use the PNG files for the transparency, due to the compression method of the game engine, you can see the seam when using transparency just like in this article: 
It's not just about a RGB image with a transparency information: Hope this helps, thank you a lot for your works again :D You can read about it on some game making community:īecause of the difference, some time we use PNG, and some time TGA, based on the requirement / situations, so I'm looking forward to the TGA exporting feature :D TGA is loaded faster than compressed PNG.The compression won't make huge difference, since the game engines will compress the image to it own format.JPG is a no-go since it is a compressed format and can't store the alpha channel.This problem caused the unwanted artifact when using in game engines.
(this is why there is a plug in for photoshop called superpng existed). It can be absolute white, black or just some color from the other area.
Some software (even photoshop, I don't know if they fixed it or not) will fill in random color for RGB channels where the alpha value is 0 (fully transparent). PNG, the software will automatically treats the alpha channel as transparency, which is hard to deal with. The alpha channel of TGA is separated when opened, so we can take control of it easily. Because of some difference in how the photographic softwares treat the Alpha channel of each extension:
0 kommentar(er)
