![:mdr:](https://www.homecinema-fr.com/forum/images/smilies/icon_mrgreen.gif)
[EDIT de Jose - vous avez ci-dessous un mail important de Cine4Home en ANGLAIS. Si vous descendez encore un peu, vous aurez une traduction (par mes soins, pas par Babelfish) en FRANCAIS. Merci.
![;-)](https://www.homecinema-fr.com/forum/images/smilies/icon_wink.gif)
.
.
|
Modérateurs: Modération Forum Home-Cinéma, Le Bureau de l’Association HCFR • Utilisateurs parcourant ce forum: Aucun utilisateur enregistré et 25 invités
Jose Hidalgo a écrit: Ce qui a le mérite de dépassionner le débat. Il n'en reste pas moins que ton affirmation de départ "le gamma n'est PAS calibré" était donc incorrecte ou excessive non ? (simple question, c'est pour comprendre, car il me semble bien que C4H a fait sa part de travail, aussi bien sur la colorimétrie que sur le gamma, sans mentionner le contraste).
C4Home a écrit:The graphs you can see are measured with the Auto Iris in On position. The Auto iris has a certain effect on the gamma curbe. As we want to keep the tuning as universal as possible, we set the gamma of the Z4 so that it works for Iris On and Off. We do that because some people might find the Auto Iris function disturbing (as we noted in our reviews) and have the option then to switch to Auto Iris Off position, without re-adjusting the whole gamma.
Second, the Auto-Iris works differently for different picture-content. Now if you use different gray-patterns (whole screen / frame) you get slightly different gamma results anyway. It is illusionary to think that with a Z4, you can control the gamma to the point for every image-content during a movie. Same goes by the way for a Ruby.
C4Home a écrit:Fifth, we use sensors which are very light sensitive to make the results more representative. For example, if you use the common Gretag Mc Beth Sensor, it might be great as a spectrometer, but it certainly is not very light sensitive, especially not when measuring a Z4 with the iris set to 7000:1 contrast.
C4Home a écrit:Every projector we tune does not lose detail in dark areas and does certainly not clip!! Any other statement based on the Iris-On graphs is pure speculation we have to reject here.
C4Home a écrit:The intra-contrast is definitely not diminished by a margin, that it is visible even in high contrast movie-pictures. We made many tests with different types of filters to check this. In addition, a “professional” should know, that in normal living rooms, the intra contrast of the picture is diminished by a much bigger amount (from 500:1 to way below 100:1 !!) and that any marginal loss in a black room is even less in a room with white walls.
Cine4Home a ses propres critères de calibrage qui sont différents des miens.
Je n'ai absolument pas l'intention de déclencher une polémique sur le sujet.
Unhunter a écrit: me faut une petite image, une focale courte, une chambre noire, et un écran, après ça donnera surement qq chose de correct
|
|