Compositing allows artists to play with documentary and fictional effects in infinitely variable combinations in their works. They thus question the spectator on the instability, transitivity and power of images in today's world, commenting on the media confusion maintained by the dominant socio-cultural apparatuses. The aim here is to analyse current developments in composite as a critical tool in art. These questions will be considered by analysing the importance of the composite in the metamorphic image on the one hand. On the other hand, a definition of "transcomposite" will be proposed based on the study of composite images that are transferred from one medium to another.