I try to set up an image as background for a basic blender tutorial, but it isn't visible.
This is the image I try to have as background:
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Background images will only be displayed in:
Camera Prespective view (Numpad 0)
Any of the preset Orthographic views:
Front/Back (Numpad 1 or Crl Numpad 1)
Right /Left (Numpad 3 or Crl Numpad 3)
Top/Bottom (Numpad 7 or Crl Numpad 7)
You're in perspective mode instead of orthographic mode (see the upper left hand corner, it has the abbreviation "persp"). Toggle into orthographic view by pressing numpad 5.
Also, the view information at the top left shows you are in right view, and the background image settings at bottom right show that the image is set to appear only in left view. For that, hit CTRLnumpad 3 to go to left view or change the background image axis to Right to make the background image appear in right view.
The image used must be in a format that Blender supports. For example, a .gif file will not be displayed.
As answered by Pisurquatre "use Camera Perspective view (Numpad 0)".
Adjust your scene, in viewport, to your liking.
Ctrl+Alt+Numpad 0 to set the camera to this view.
Select in 'View' the 'Lock Camera to View' option.
In the 'Background Images'option, where you have 'Left' selected, instead select 'Camera'.
While in this view, you will be able to adjust the scene AND see the background, too.