The Sepia adjustment works like the Color monochrome adjustment, except the sepia color is already selected for you.
A sepia tint can be applied directly to a single layer or, using a color adjustments layer, to multiple layers in a composition.
To apply a sepia tint to the currently selected layer, do one of the following:
To apply a sepia tint to multiple layers in a composition using a color adjustments layer (all layers below this layer will be affected):
Note: If the adjustment isn't visible, you can turn it on from the Customize menu at the bottom of the Color Adjustments pane.
2. Drag the intensity slider to control the strength of the Sepia adjustment.
Show Original: Click the Show Original button or press+ on your keyboard to see what the image looks like without any color adjustments.
Show Split Comparison:– click the Show Original button, press + on your keyboard, or force click the canvas.
To reset all Color Adjustments, click Reset at the bottom of the Color Adjustments pane.