Things You'll Need
Instructions
Purchase several sheets of clear acetate. These are also called overhead projector transparencies.
Create multiple image files with swatches of color that match your desired filter colors. You can look at commercially available lighting filters to see the range of colors they use and copy them. Make each swatch as large as you would like the resultant filter to be. The easiest method is to create several 8-by-10-inch swatches of color that will fill an entire acetate sheet.
Use a professional printing service to print each swatch on one acetate sheet. If your swatches are small, you can print multiple on the same sheet.
Cut each acetate sheet to the size of your swatch so that there is no transparent film remaining.
Cover your flash bulb with one of your colored acetate sheets to create a photo lighting filter. The filters can be attached to a flash bulb or lamp with clear tape. The tape will adhere to the acetate but can be peeled off easily without leaving a residue. You can also use a commercially available gel holder.