Trapping tiff files in Illustrator

No dear the job is in 7 colors 4 basic and 3 spots. i have a solution to solve my problem by splitting channels but it is little bit lengthy.

Generally, trapping is done by your printer if and when it's necessary, the width and type of trapping would be determined by the printing method. Trapping is done in the rip automatically and is more accurate than can be done by hand. If you are supplying your printer with pre-trapped files, this could cause unexpected results. That said, if you want to trap in Illustrator by hand, you can create a thin stroke on the vector art over the image and set it to overprint. In order to trap one image to another, you can copy the top image, then set the transparency of the image to multiply, paste the image in place, create a clipping mask, then shrink the clipping mask a small amount. The difference between the multiplied image and the normal image is your trap area.

No, you cannot trap images in Illustrator.

But you can trap vector objects with the Pathfinder panel menu.

To trap images use Photoshop: Image menu > Trap

What do you mean by "trapping"?