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La d\u00e9gradation de la qualit\u00e9 d'image est flagrante en basse luminosit\u00e9 sur un agrandissement \u00e0 100% de l'image.<\/figcaption><\/figure>\n

Pour savoir quel capteur a effectivement shoot\u00e9 une image, rien de plus simple : il suffit de regarder sa taille\u2009! Si elle fait 4608 x 3456 pxls, elle a \u00e9t\u00e9 r\u00e9alis\u00e9e par le capteur principal. Si elle contient 5184 x 3880 pxls, elle a \u00e9t\u00e9 cr\u00e9\u00e9 par le capteur secondaire. Simple, non\u2009? Une m\u00e9thode plus triviale consiste bien entendu \u00e0 poser ses gros doigts successivement sur l\u2019un ou l\u2019autre des objectifs afin de d\u00e9terminer celui qui est en utilisation.<\/p>\n

Intelligent Pixel<\/h2>\n

Mais revenons donc dans le vif du sujet. 10 Lux ce n\u2019est pas grand-chose et on se demande bien comment un capteur dont les photosites plus petits et plus nombreux sur une surface plus petite peuvent diminuer le bruit num\u00e9rique alors que les lois de l\u2019optique proclament<\/strong> haut et fort le contraire\u2026
\nC\u2019est l\u00e0 qu\u2019entre en sc\u00e8ne Intelligent Pixel qui, d\u2019apr\u00e8s OnePlus, agrandit artificiellement la taille des photosites du capteur en les regroupant quatre par quatre<\/strong>. La lumi\u00e8re est donc enregistr\u00e9e bien plus pr\u00e9cis\u00e9ment l\u2019image produite bien moins fruit\u00e9e et tout le monde est content, \u00e0 un d\u00e9tail pr\u00e8s.<\/p>\n

En regroupant les photosites par quatre, la d\u00e9finition devrait logiquement passer \u00e0 5 Mpxls (quatre fois moins que celle produite par le capteur), mais ce n\u2019est pas le cas. Et bien s\u00fbr, OnePlus reste d\u2019une discr\u00e9tion de violette sur la m\u00e9thode employ\u00e9e pour revenir aux 20 Mpxls d\u2019origine : s\u2019agit-il d\u2019une simple interpolation num\u00e9rique\u2009?<\/strong> Ou la teinte et la luminosit\u00e9 de chaque pixel de l\u2019image finale sont-elles calcul\u00e9es en fonction de ceux qui l\u2019entourent\u2009? Myst\u00e8re. Et pour tout dire, on s\u2019en moquerait compl\u00e8tement si le r\u00e9sultat \u00e9tait \u00e0 la hauteur de la promesse, ce qui n\u2019est h\u00e9las pas toujours le cas.<\/p>\n

\"test<\/p>\n

Nous avons ainsi shoot\u00e9 plusieurs images \u00e0 10 lux et moins afin de voir comment se comportait l\u2019appareil du\u00a0OnePlus 5 T. A priori<\/em>, le r\u00e9sultat est correct tant que l\u2019on se contente l\u2019examiner sur l\u2019\u00e9cran du smartphone ou qu\u2019on le partage en ligne<\/strong>. Les choses se g\u00e2tent d\u00e8s que l\u2019on veut recadrer la sc\u00e8ne ou imprimer l\u2019image en grande taille. Intelligent Pixel applique un lissage assez cons\u00e9quent afin d\u2019\u00e9liminer le bruit num\u00e9rique et cela se voit rapidement.<\/p>\n

Heureusement, toutes les images r\u00e9alis\u00e9es avec un OnePlus 5T n\u2019ont pas vocation \u00e0 \u00eatre recadr\u00e9es outrageusement ni \u00e0 \u00eatre imprim\u00e9es.<\/strong> Dans l\u2019immense majorit\u00e9 des cas, on se satisfera du rendu final qui est de toute fa\u00e7on meilleur que ce qu\u2019on obtenait avec le OnePlus 5 d\u2019origine<\/strong> : sur ce point, le constructeur a donc raison.<\/p>\n

Lorsque le capteur principal est \u00e0 l\u2019\u0153uvre, les images sont meilleures et le bruit num\u00e9rique bien mieux ma\u00eetris\u00e9<\/strong>. Jusqu\u2019\u00e0 400 Iso pas de gros probl\u00e8mes si ce n\u2019est une compression Jpeg un peu trop fort \u00e0 notre gout qui amoindrit les d\u00e9tails les plus fins. Le bruit commence \u00e0 \u00eatre vraiment visible \u00e0 800 Iso pour devenir inacceptable au-del\u00e0.<\/p>\n