DM6446 Resizer Question

Is there a way to implicitly do a multiply or gain on a pixel-by-pixel basis using the resizer while doing a copy without utilizing the CPU's ALU?  We'd like to control the gain of our output image without explicitly doing an ALU multiply on each pixel on each frame since this is very processor intensive and costly.  We are using the NTSC DAC encoder on the DM6446, is there a way to control the gain at that point?  Any suggestions would be appreciated.