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The main steps in this video
Create a New Image: Click the ‘New File’ button to start a new image. You’ll see tabs for common photo sizes and film and video formats.
Choose Image Format: For this example, select the ‘HDTV 1080p’ format under the film and video tab. This is a full HD video format.
Select Background Color: Click on the ‘Background Contents’ color. Use the spectrum slider to find a blue hue, then use the swatch to select the precise shade. Once you’re happy with the color, click ‘OK’.
Create the Image: Click the ‘Create’ button, and you’ll see your new blue background image.
Save the Image: To save your new image, go to ‘File’ > ‘Save As’. Give the image a sensible name for easy identification later, and click ‘Save’.