Poor quality of png import

I’ve got a 300dpi file (just some drawing in photoshop) that I need to bring into flash.
In photoshop i change the dpi to 72, save for web as png-24, then import to the flash library.
I even made sure the image wasn’t on a floating integer (x,y), made sure the quality was set to 100, I even tried scaling it down in flash. But no matter what I do the image looks so pixelated and poor. I’m on mac - mx2004. What the hell could fix this? Gotta be one of the most annoying things.