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BenCarlson
Joined: 14 Sep 2016
Posts: 3
Location: Belgium
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| Posted: Wed Sep 14, 2016 8:55 pm Post subject: Luma compression with YCbCr on HDFury2 |
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I understand I'm a bit late with this question, but...
My HDFury2 is obviously compressing the Y video range by about 10~12 % (hint: sounds like mapping full range to legal video ranges). I tried and confirmed with different sources.
This is problematic only in the sense that since gain has to be added after processing by the HDFury2, there is a small loss of video quality, certainly when the video is 8 bit.
Is this a generic problem with the HDFury2 ? Or is there a EPROM update ?
Tx
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Wed Sep 14, 2016 9:15 pm Post subject: |
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You're right, you are a bit late.  We haven't done Fury tech support in years, and the product is now discontinued. you could try emailing the people at HDfury.com, but for a better HDMI to RGB conversion, get one of the Moome products off of our for sale section. there have been several side by side comparisons made between the Fury and the Moome product, and the Moome is much better.
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kal
Forum Administrator
Joined: 06 Mar 2006
Posts: 18114
Location: Ottawa, Canada
TV/Projector: JVC DLA-NZ7
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| Posted: Thu Sep 15, 2016 2:56 am Post subject: Re: Luma compression with YCbCr on HDFury2 |
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| BenCarlson wrote: | | My HDFury2 is obviously compressing the Y video range by about 10~12 % (hint: sounds like mapping full range to legal video ranges). I tried and confirmed with different sources. |
Strange, as it actually does the opposite. From the Hdfury2 manual:
| Quote: | Colour Depth Upscaling
Can I turn the colour depth upscaling feature off?
The HDfury2 expands the regular 16-235 image range to 0-255 for greater contrast
ratio. This may not be disabled. If you require that colour depth upscaling always be
disabled consider the HDfury3. The HDfury3 allows you to enable or disable colour
depth upscaling. |
| Quote: | | This is problematic only in the sense that since gain has to be added after processing by the HDFury2, there is a small loss of video quality, certainly when the video is 8 bit. |
What do you mean by gain? Feeding 16-235 or 0-255 into a display simply means that you'll have to set the displays brightness/contrast depending on the signal. It's one a one time adjustment and if properly set, the two will look identical. No loss or gain of information.
Kal
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BenCarlson
Joined: 14 Sep 2016
Posts: 3
Location: Belgium
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| Posted: Mon Sep 19, 2016 4:16 pm Post subject: |
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| Quote: | | What do you mean by gain? Feeding 16-235 or 0-255 into a display simply means that you'll have to set the displays brightness/contrast depending on the signal. It's one a one time adjustment and if properly set, the two will look identical. No loss or gain of information. |
Well, say I'm feeding into a capture hardware box and editing app with 8 bit color depth; since the actual luma range as received from the HDFury2 is reduced by about 10%, the capture process will map this to 16-212 instead of 16-235, so I'm losing some resolution, no matter how good the editing app is at processing a 10% gain increase (effect added to extend to the full 16-235)
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BenCarlson
Joined: 14 Sep 2016
Posts: 3
Location: Belgium
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| Posted: Mon Sep 19, 2016 4:18 pm Post subject: |
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Note, the capture hardware has no analog gain control; so I can fix the gain shift only on after digitizing (capture)
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