In general, we’ll use format d’image, or if context is clear, only format. For example:
Écran de résolution 1600 x 900 et de format 16:9.
If you want to emphasize that it’s a ratio, you can also use rapport d’aspect or rapport de l’image.
The technical term is “ratio d’aspect”.
Wikipedia suggests format d’image. Another, maybe more technical term, could be rapport d’aspect, analogous to rapport d’aspect de pixel.
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