Is there a way to achieve exactly (that's crucial) the same corner bend definition of a plane in blender?
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You can use an armature to deform a sub-divided plane. Select the plane and shift select the Armature to make it the primary selection with the plane as the secondary selection.
Press Ctrlp to parent the plane to the armature. I selected Armature Deform with Automatic Weights.
There is a color picker available to select colors from other areas visible in the UI.
If you hover over the color field of a node and press the e key you can then click on an image that has has been drag 'n dropped into the UV Image Editor. Now you can pick the various colors of the image to use for the Material and Sky colors.
You can use Freestyle to add the edge highlighting.
The setup is shown in the following two images.
(i)Activate Freestyle in the Render tab (ii)Add a Lineset (iii)Change the color to match.
The color of the paper is multiplied by 3.0 to brighten it up.
To get the exact shape of the reference image, you can try a more detailed Armature.
Another option is to add a sphere and use the Snap tool(magnet icon).
Snapping activates when you select one or more vertices and press g and then enter to set the movement.