How to add pixelation effects to selected areas.
You may want to use pixelation to obscure someone’s face, a brand logo, an address, or other sensitive information in a photo. To pixelate just a portion of your image, create a mask and apply the filter selectively:
1. Work in your Smart Filter.
After you’ve followed steps 1–3 above, click OK. Then select the Smart Filters rectangle in the Layers panel.
2. Select your tool.
Choose the Eraser tool to remove small sections of pixelation. Or opt for the Marquee or Lasso tools to remove larger sections of pixelation.
3. Remove the pixelation.
Use the Eraser on the area you’d like to keep free from the effect. Or select larger areas with the Marquee or Lasso tools, and then hit Delete to remove the effect from that area.
Another way to selectively pixelate is to use the Select Subject tool. Just follow these steps:
1. Select your subject.
From the top menu, click Select › Subject.
2. Invert the selection.
Go back to the top menu and click Select › Inverse to apply it to the background.
3. Pixelate the area.
In the top menu, select Filter › Pixelate › Mosaic.