In my link above there is considerable detail, but I'll repeat a bit of it here.
The layman who sees something which 'looks like' a painting will call it a painting and be none the wiser.
What usually fools people is the image laying on top of canvas.
Canvas is associated with painting.
However . . .
Any image can be transferred (bonded) to canvas from a print.
The offset lithograph is done by a machine. It differs radically from an original print hand-crafted by an artist in an atelier.
It is a glorified photo process.
1. The artist paints an original painting.
2. The painting is photographed.
3. The colors are electronically "separated" and printing on special paper.
4. The combined layers produce a simulacrum of the original image.
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5. iF the lithograph image is then transferred to canvas it takes on the appearance of the original painting.
6. The addition of "brush strokes" with transparent gel which hardens atop the image adds verisimilitude.
7. The unwitting collector assumes he is buying an original painting, but it is dishonestly worded to say so.