Using Erase Mode, you are able to apply a specific filter/effect on a particular area of an image. There are two different ways you can apply a partial effect using Erase Mode. This was previously called Paint Mode in BeFunky, and works the exact same way.
The first option will have you apply the effect to the entire image, then use Erase Mode to erase unwanted areas:
Step 2: Click into the effect settings, and select the Erase panel.
Step 3: Adjust your brush size, brush hardness, and brush strength.
Step 4: Begin erasing the areas you wish to not have the effect applied.
Step 5: Use Remove/Keep to either add or subtract parts of the effect on your image.
Step 5: Click the blue checkmark to apply your effect.
The other option will have you manually add the effect onto the desired area:
Step 2: Click into the effect settings, and select Erase.
Step 3: Select the Inverse button to reverse the applied effect.
Step 4: Adjust your brush size, brush hardness, and brush strength.
Step 5: Begin painting on the effect in the areas you wish to apply the effect.
Step 6: Use Remove/Keep to add or subtract the effect to parts of your image.
Step 6: When you've painted your desired area, select the blue checkmark to apply the effect.