Channel Blur effect
The
Channel Blur effect blurs a layer’s red, green, blue, or alpha channels
individually.
Note: If you have noise or artifacts primarily in
one color channel—such as MPEG compression artifacts in the blue
channel of DV footage—use Channel Blur to clean up the noise in
that channel, leaving the other channels sharp.
This effect works with 8-bpc, 16-bpc, and 32-bpc color.