In this tutorial, I go over 5 different methods of adding a background image to the 3D viewport. The methods I will show you are: A reference image, background image, adding an empty, images as plane and the world background. The last two methods are renderable.
Please see Manipulating The Color, Brightness And Contrast Of Background Images [ Ссылка ] As an addition to this tutorial
Also see Rendering Background Images With Your Scene Using The Alpha Over Node [ Ссылка ]
Also See Render Your Scene With Background Images Using The Alpha Over Node In The Compositor [ Ссылка ]

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