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Install Fonts in N900 (67)
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quipper8 |
2010-05-17
, 14:13
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Posts: 1,096 |
Thanked: 760 times |
Joined on Dec 2008
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#11
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having plugged mine in to many hotel and friends and work tvs, i can tell you that the quality of the picture varies greatly between tvs and is more about the tv than the n900
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2010-05-17
, 14:39
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Posts: 3,319 |
Thanked: 5,610 times |
Joined on Aug 2008
@ Finland
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#12
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Originally Posted by acou
The TV-out is an analog signal so the concept of color depth does not really apply.
So what's the color depth for tv-out?
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Blogging about mobile linux - The Penguin Moves!
Maintainer of PyQt (see introduction and docs), AppWatch, QuickBrownFox, etc
Blogging about mobile linux - The Penguin Moves!
Maintainer of PyQt (see introduction and docs), AppWatch, QuickBrownFox, etc
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2010-05-17
, 14:55
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Posts: 42 |
Thanked: 16 times |
Joined on Jan 2010
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#13
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I have a tv that was "very good" some years ago when I bought it (some Philips 100hz thing), but I also find the picture too dark to be pleasant (I played around with picture settings on the tv, but it's too cumbersome). And also the sound is too silent, even when I put the volume on the N900 to 100%. On the N900 itself the thing is blasting my ears of then, but when connected to the tv, the sound is very low ...
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2010-05-17
, 20:50
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Posts: 136 |
Thanked: 72 times |
Joined on Jan 2010
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#14
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Originally Posted by attila77
Erm, let me rephrase.
The TV-out is an analog signal so the concept of color depth does not really apply.
What is the value of the color depth of the (digital) video signal which is then sent to the TV via (analog) composite?
See also this abandoned thread for further clarification.
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2010-05-17
, 23:29
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Posts: 4,930 |
Thanked: 2,272 times |
Joined on Oct 2007
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#15
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Originally Posted by acou
It comes straight from the framebuffer, so it starts at 16bpp (5/6/5). Whether there's any further reduction, I don't know, but keep in mind TV signals operate in non-RGB colorspaces (YUV/YIQ), so trying to track bit depths is not as meaningful as it might appear. Obviously, converting 16-bit (5/6/5) RGB to 16-bit (?/?/?) YUV will have different effects depending on the relative bit depths, and will include a loss of precision in any case.
Erm, let me rephrase.
What is the value of the color depth of the (digital) video signal which is then sent to the TV via (analog) composite?
See also this abandoned thread for further clarification.
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World's first inductively-charged N900!
World's first inductively-charged N900!
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2010-05-18
, 02:31
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Posts: 36 |
Thanked: 21 times |
Joined on Mar 2010
@ USA
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#16
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Works great on my trusty Sony CRT (KD34-XBR960). I just bump up the brightness and contract and the picture is very acceptable imo. The cool part is using my Nokia BH-604 bluetooth stereo headset to control audio/video playback from across the room.
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2010-05-19
, 11:07
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Posts: 70 |
Thanked: 410 times |
Joined on Sep 2009
@ Fife, Scotland.
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#17
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Originally Posted by Benson
I looked at the datasheet - it's not really clear - but implies there will not be significant truncation - the inputs to the colour generator stages are all as wide as the input data.
It comes straight from the framebuffer, so it starts at 16bpp (5/6/5). Whether there's any further reduction, I don't know, but keep in mind TV signals operate in non-RGB colorspaces (YUV/YIQ), so trying to track bit depths is not as meaningful as it might appear. Obviously, converting 16-bit (5/6/5) RGB to 16-bit (?/?/?) YUV will have different effects depending on the relative bit depths, and will include a loss of precision in any case.
The major loss of precision is in the chroma bandwidth. For NTSC - it's around 150 pixels across the screen of different colour.
The relevant file is http://mxr.maemo.org/fremantle/sourc...ap2/dss/venc.c
You might try playing with the 'gain' values. However - this may saturate the output.
The DAC claims 0.88V into a 75 ohm load.
I tried sticking a scope on it, but diddn't get the video output to turn on - must be doing something silly.
Last edited by SpeedEvil; 2010-05-19 at 11:59.