The Sponge tool changes the color saturation
or vividness of an area.
Increasing saturation by scrubbing with the Sponge tool
Select the Sponge tool .
Set 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
Increases or decreases color saturation. Choose Saturate
to intensify the color’s saturation. In grayscale, Saturate increases
contrast. Choose Desaturate to dilute the color’s saturation. In grayscale,
Desaturate decreases contrast.
Flow
Sets the rate of saturation change. Drag the Flow pop‑up
slider or enter a value in the text box.
Drag over the part of the image you want to modify.