In the Layers window, select the top most layer and use the “Create new adjustment layer” icon to add a new adjustment layer.
Select the type of adjustment layer to use. Any changes to the adjustment layer will affect all the frames and layers below it.
Play around with different types of adjustments to get the desired effect. When you’re ready to save, go to the “Save for Web and Devices” dialog. Select GIF, and the desired number of colors. Be sure check the Transparency, Matte, and Animation Options at the bottom of the dialog. Click “Save” and save the file as a new name.
With the Animation/Timeline window open, select all the frames and click the “trash” icon.
Go to the Layers window, and select the first layer. With the layer selected, click the “fx” icon to reveal the “Blending Options” menu.
Apply the desired blending option to the first layer. A good choice for the black and white icons is Color Overlay.
Once the blending option is set, right-click on the layer and select “Copy Layer Style”. Then select all the other layers, right-click again and select “Paste Layer Style”. All your layers should now have the same effects.
In the Animation/Timeline window, choose the more menu in the upper right. Select “Make Frames from Layers” to turn each layer into an individual frame.
Select all the frames again and click the down arrow beneath any frame. Here you can set the frame speed. To set it to the original speed, select “Other” and enter 0.03.
You’re now ready to save. Select “Save for Web and Devices” from the File menu. Select GIF, and the desired number of colors. Be sure to check the Transparency, Matte, and Animation Options at the bottom of the dialog. Click “Save” and save the file as a new name.