The Sponge tool saturates or desaturates areas
of the image. You can use the Sponge tool to bring out or mute the
color on an object or area.
Select the Sponge tool . If
you do not see the Sponge tool, look for the Dodge or Burn tool.
Set the tool options in the Options bar.
Brushes pop‑up menu
Sets the brush tip. Click the arrow next to the brush sample,
choose a brush category from the Brushes pop‑up menu, and then select
a brush thumbnail.
Size
Sets the size of the brush, in pixels. Drag the Size slider
or enter a size in the text box.
Mode
Sets whether to saturate or desaturate.
Flow
Sets the strength of the tool with each stroke. In Saturate
mode, a higher percentage increases the saturation. In Desaturate
mode, a higher percentage increases the desaturation.