Color-mask problem(with imported bitmaps)!!!! Help me pleaseeeeeeee!!!

[Guest_imported]

I am new to illustrator, and i have found problems importing bitmaps to illustrator. I have made a cool draw with 3DSMAX and saved it in tif format, with the alpha channel included. When i open thos file with photodshop it looks really cool and the alpha works perfectly. But when i import it to illustrator, y have found that it lose a lot of color in the gradents and also it gains a lot of pixelation in the borders (the alpha channel dont work as well as it does in photoshop). I think it can be cause of the color management, but i have played with these controls a lot and i have not got any result.

The other problem i have is that i want to export my draw from illustrator to jpg, but at an particualar resolution, and i have not found anything to control it :___( It always go at 804x604. I have found an option, for selecting the work area but for what i can see it only affect the printing options.

PLEASE HELP ME I CANNOT FIND BY MYSELF THESE THINGS

 

[askIllustrator]

Illustrator only shows you a preview of the placed art, it would be too slow to try and redraw a hi-res image every time you moved something. But I assure you, if you were to print the image at the same size and with the same color profile out of both Illustrator and photoshop you would not be able to see the difference.
As far as the jpeg goes, why would you force the image to pass through illustrator when photoshop can output a jpeg just fine?