Actually it does. With CMYK, you can't save it as PNG, because CMYK is if you're printing images out. So the colours will be different. You have to use RGB colour with 8 bits/Channel.
I wanna ask you something.
I've recently been making graphics on Photoshop, but when I upload them to the internet, the colours seem to be a bit disoriented and stuff. Would you know how I could fix this?
You being an awesome graphics maker, I thought you might know.