Καλη επιστροφη σε ολους! (Τα κεφαλια μεσα....)
Διαβαζοντας στο Avsforum, μου εκανε εντυπωση ενα ποστ του -παντα εγκριτου- reviewer Greg Rogers, ο οποιος εξηγει με απλα λογια που οφειλεται η καπως μαλακη (CRTικη) εικονα του Ruby σε σχεση με εναν κορυφαιο μονοτσιπο dlp :
What you are seeing as softness in the Ruby is not caused by a high frequency roll off in its digital signal processing. It's caused by the lens, which has a rather poor MTF compared to the Qualia 004 lens (for instance) or the lenses used on some more expensive DLP projectors (the Marantz VP-11S1 to name just one), although it still produces better sharpness than any CRT projector. That is obvious when simply looking at its internally generated menu versus the menu of the Qualia 004 or the VP-11S1, or other projectors with a better lens/optical system (RGB light splitting and 3 panel optical system design, etc.).
Misalignment of the 3 panels will also contribute to image sharpness, although that is a tricky function. If the panels are badly misaligned (as some seem to be) there will be distinctly separate red, green, or blue lines when there should only be a single white line. In that extreme case, sharpness is not affected per se, but it creates color outlining in parts of the picture.
If the misalignment is somewhat better, it produces color fringing that affects both perceived sharpness and produces mis-colored edges.
If the misalignment is relatively good, but not perfect, then it just affects perceived sharpness.
Only if the misalignment is virtually perfect (almost impossible for 1080p panels), will it have negligible effect on sharpness.
So the Ruby has a combination of lens, optical block, and panel misalignment as contributing factors to sharpness. Therefore a single chip DLP projector with a good lens can have much better image sharpness as we have seen, and therefore display the video source image more accurately. Whether it is subjectively desirable to accurately display the video source image, and whatever artifacts it may contain, is another issue. But I believe each component in the video chain should be as accurate as possible and then fix the problems where they originate - which is often in the source, rather than cover them up by de-tuning display components. If you want a softer image, you can always defocus the lens of a really good projector - but I'll bet not too many people will elect to do that with a 1080p projector - as some did with much lower resolution projectors to hide screen door artifacts.
(Πηγη : Avsforum: http://www.avsforum.com/avs-vb/showthread.php?t=707550&page=3&pp=20)
Φυσικα, η ευκρινεια της εικονας, αν και σημαντικη, παραμενει μια μονο παραμετρος για την σωστη εικονα και ειναι παντα υποκειμενικο το ποσο θελει καθενας απο εμας. Ομως, συμφωνω με τον Rogers, οτι προτιμω να εχω εναν υπερευκρινη προβολεα και να μειωσω την ευκρινεια του με defocus, παρα εναν πιο θωλο ο οποιος δεν μου δινει δυνατοτητα να δω την εικονα με την μεγιστη ευκρινεια παρα μονο με τεχνητα μεσα (οπως προσθηκη Edge Enchancement).
Τι λετε εσεις?
Διαβαζοντας στο Avsforum, μου εκανε εντυπωση ενα ποστ του -παντα εγκριτου- reviewer Greg Rogers, ο οποιος εξηγει με απλα λογια που οφειλεται η καπως μαλακη (CRTικη) εικονα του Ruby σε σχεση με εναν κορυφαιο μονοτσιπο dlp :
What you are seeing as softness in the Ruby is not caused by a high frequency roll off in its digital signal processing. It's caused by the lens, which has a rather poor MTF compared to the Qualia 004 lens (for instance) or the lenses used on some more expensive DLP projectors (the Marantz VP-11S1 to name just one), although it still produces better sharpness than any CRT projector. That is obvious when simply looking at its internally generated menu versus the menu of the Qualia 004 or the VP-11S1, or other projectors with a better lens/optical system (RGB light splitting and 3 panel optical system design, etc.).
Misalignment of the 3 panels will also contribute to image sharpness, although that is a tricky function. If the panels are badly misaligned (as some seem to be) there will be distinctly separate red, green, or blue lines when there should only be a single white line. In that extreme case, sharpness is not affected per se, but it creates color outlining in parts of the picture.
If the misalignment is somewhat better, it produces color fringing that affects both perceived sharpness and produces mis-colored edges.
If the misalignment is relatively good, but not perfect, then it just affects perceived sharpness.
Only if the misalignment is virtually perfect (almost impossible for 1080p panels), will it have negligible effect on sharpness.
So the Ruby has a combination of lens, optical block, and panel misalignment as contributing factors to sharpness. Therefore a single chip DLP projector with a good lens can have much better image sharpness as we have seen, and therefore display the video source image more accurately. Whether it is subjectively desirable to accurately display the video source image, and whatever artifacts it may contain, is another issue. But I believe each component in the video chain should be as accurate as possible and then fix the problems where they originate - which is often in the source, rather than cover them up by de-tuning display components. If you want a softer image, you can always defocus the lens of a really good projector - but I'll bet not too many people will elect to do that with a 1080p projector - as some did with much lower resolution projectors to hide screen door artifacts.
(Πηγη : Avsforum: http://www.avsforum.com/avs-vb/showthread.php?t=707550&page=3&pp=20)
Φυσικα, η ευκρινεια της εικονας, αν και σημαντικη, παραμενει μια μονο παραμετρος για την σωστη εικονα και ειναι παντα υποκειμενικο το ποσο θελει καθενας απο εμας. Ομως, συμφωνω με τον Rogers, οτι προτιμω να εχω εναν υπερευκρινη προβολεα και να μειωσω την ευκρινεια του με defocus, παρα εναν πιο θωλο ο οποιος δεν μου δινει δυνατοτητα να δω την εικονα με την μεγιστη ευκρινεια παρα μονο με τεχνητα μεσα (οπως προσθηκη Edge Enchancement).
Τι λετε εσεις?
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