Re: Native resolution of LCD monitors?

2009-05-17 Thread Clark Martin

PeterH wrote:
 
 On May 16, 2009, at 8:43 PM, Clark Martin wrote:
 
 CRTs have no inherent resolution ...
 
 Sure they do.
 
 They either have one and only one horizontal sweep frequency and one  
 and only one vertical sweep frequency, or they have sets of  
 horizontal and sets of vertical sweep frequencies which are detected  
 by the interface and automatically switched by adding or deleting  
 resonant elements, usually capacitors, to select the new frequencies.
 
 There is a limited capture range for each set of frequencies.

No they don't.  They can operate over a range of frequencies for both 
vertical and horizontal.

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Re: Native resolution of LCD monitors?

2009-05-17 Thread PeterH


On May 16, 2009, at 11:13 PM, Clark Martin wrote:

 They either have one and only one horizontal sweep frequency and one
 and only one vertical sweep frequency, or they have sets of
 horizontal and sets of vertical sweep frequencies which are detected
 by the interface and automatically switched by adding or deleting
 resonant elements, usually capacitors, to select the new frequencies.

 There is a limited capture range for each set of frequencies.

 No they don't.

 They can operate over a range of frequencies for both
 vertical and horizontal.

Which is precisely what I stated: ... they have sets of
horizontal and sets of vertical sweep frequencies which are detected
by the interface ...

I take it you are not an electrical engineer. I am.


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Re: Native resolution of LCD monitors?

2009-05-17 Thread Clark Martin

PeterH wrote:
 
 On May 16, 2009, at 11:13 PM, Clark Martin wrote:
 
 They either have one and only one horizontal sweep frequency and one
 and only one vertical sweep frequency, or they have sets of
 horizontal and sets of vertical sweep frequencies which are detected
 by the interface and automatically switched by adding or deleting
 resonant elements, usually capacitors, to select the new frequencies.

 There is a limited capture range for each set of frequencies.
 No they don't.
 
 They can operate over a range of frequencies for both
 vertical and horizontal.
 
 Which is precisely what I stated: ... they have sets of
 horizontal and sets of vertical sweep frequencies which are detected
 by the interface ...
 
 I take it you are not an electrical engineer. I am.

Yes, I am an EE.  CRTs don't have sets of frequencies they can lock on 
to a range of frequencies.  And whether they use a range or have sets 
they still do not have a single inherent resolution.  And capacitors are 
not resonant elements.  If you were an EE you'd know that.


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Macintosh / Internet Consulting

I'm a designated driver on the Information Super Highway

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Re: Native resolution of LCD monitors?

2009-05-17 Thread dorayme

 From: Paul


 On May 16, 3:41 pm, PeterH peterh5...@rattlebrain.com wrote:
 On May 16, 2009, at 1:05 PM, Paul wrote:

 Many, if not all, LCD monitors have a single best resolution and
 frequency.

 Many, if not all, monitors of ANY TYPE have a single best resolution
 and frequency, moreso with CRTs than with LCDs, however.



 I've usually gotten a very good picture using more than one resolution
 on a CRT, but I haven't yet found more than one clean-looking
 resolution on an LCD monitor. With an LCD, I think what they do is
 cluster a few pixels into one to handle anything less than the maximum
 resolution. That makes the view somewhat fuzzy.


I can second that CRTs seem able to handle different resolutions  
better. Whenever I have looked at an LCD that is not real close to  
its native resolution, I have noticed it to be less than sharp.

However, there are a set number of hardware pixels, no? And both CRTs  
and LCDs need to be software herded into displaying less. I used to  
have a magnifying glass on my desk to look at my old SE30 screens to  
see the little pixels, I forget why, I recall programming a few  
things that involved graphics and measuring things... g

Let me get that old crazy feeling back... mmm

Try this on your monitors

!DOCTYPE HTML PUBLIC -//W3C//DTD HTML 4.01//EN
http://www.w3.org/TR/html4/strict.dtd;
html
head
 meta http-equiv=content-type content=text/html; charset=utf-8
 titleJust one pixel/title
/head
body
div style=width: 1px; height: 1px; background: #c00;/div
/body
/html

(Paste into BBEdit (or some text editor) and call it something.html  
and drag file over any modern browser)

and take a decko at the red pixel with a magnifying glass. Gee, the  
pxs are so fine on an LCD!

dorayme




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Re: Native resolution of LCD monitors?

2009-05-17 Thread Kris Tilford

On May 17, 2009, at 4:12 AM, dorayme wrote:

 However, both CRTs and LCDs need to be software herded into  
 displaying less.

Here's an interesting one how LCDs are TOO SHARP  CRISP and make old  
games look really BAD (too pixelated). Some students figured out how  
to software herd the LCD pixels to have CRT afterimage glow, and  
color bleed and other attributes of old phosphor CRT monitors. Be  
sure to click the links to the ENLARGED images to see how bad the LCD  
looks and how the reverse engineering makes the old games BETTER. This  
is so counter-intuitive that you'd need to reverse engineer a faster,  
sharper, crisper display to appear worse so that the game can appear  
better.

http://www.digitallounge.gatech.edu/gaming/index.html?id=2824


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Re: Native resolution of LCD monitors?

2009-05-17 Thread Doug McNutt

Some personal feelings about this thread.

Color CRT's have pixels. They are small dots of phosphor which are bombarded by 
three electron guns that send rays (the R in CRT) through a mask so they only 
hit their assigned dots. The R, G, and B drives modulate the intensity of the 
electron beams and the horizontal and vertical magnetic fields scan all three 
beams left and right and up and down.

It is common practice to assume the CRT pixels are tiny and thus ignorable in 
the conversion from pixels in computer memory and the analog voltages that 
modulate the electron guns and scan the magnetic fields.  An exception was 
cleartype software that attempted to get sub-pixel resolution in fonts by 
mucking with the actual spacing of color dots along the edges of graphemes.

LCD's have much more obvious pixels in red, blue, and green but the placement 
is not so obvious as the triangular grid used in CRT's. I'm a little fuzzy on 
the details but I believe the grid is 2 x 2 square blocks of four pixels, 1 
red, 1 blue, and 2 green with the  placement of the pixels varying in the 2x2 
squares is some intelligent fashion.

The idea of sending data in a horizontal and vertical scan of serial bits that 
continuously update a whole screen  is a throwback to CRT techniques which is 
likely necessary to make it possible for a CRT monitor to accept things like 
VGA, NTSC, and other television-like  standards.

Much better would be to give an LCD or other digital screen some memory and 
allow a computer to address each pixel while changing only the ones that need 
it.  It would be much like the screen memory in a Mac 128k and could be 
implemented with LVDS, low voltage differential signalling, that has become 
popular in the likes of SATA disks and PCI express.

Wouldn't it be nice to set a background and leave it there? Wouldn't a two wire 
connection to the LCD display be nice? For many things, but perhaps not games, 
the data rate to the LCD display would be tiny and suitable for the likes of 
X-window connections they way they were intended to run - over a network. What 
about putting an implementation of open GL into the monitor?

In any case externally synchronized horizontal and vertical scan rates on an 
LCD or other digital monitor have no real functionality and ought to be 
replaced by addressable pixels.

-- 
--The Creator is the God who provided the void and the rules that matter and 
energy must live by in order to exist in it. Intelligent designers and 
engineers create useful stuff while abiding by the rules.--

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Re: Native resolution of LCD monitors?

2009-05-16 Thread Paul

Many, if not all, LCD monitors have a single best resolution and
frequency. This resolution tends to be the highest possible for the
monitor, and the frequency is often 60 Hz. If you're trying to find it
out without looking up the documentation, there might be software to
query it and display it, or you could just use trial and error.

LCD monitors tend not to support a lot of frequencies. Higher
frequencies aren't necessary to avoid flicker, because of the higher
persistence of the image over CRT's. 60 Hz will almost always work.
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Re: Native resolution of LCD monitors?

2009-05-16 Thread PeterH


On May 16, 2009, at 1:05 PM, Paul wrote:

 Many, if not all, LCD monitors have a single best resolution and
 frequency.

Many, if not all, monitors of ANY TYPE have a single best resolution  
and frequency, moreso with CRTs than with LCDs, however.

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Re: Native resolution of LCD monitors?

2009-05-16 Thread dorayme

 From: Clark Martin


 dorayme wrote:
 At long last, I got a better card than the original that came with my
 QS 933, clearing the way for me to get a bigger screen.

 But one thing that is puzzling is how to find out the native
 resolution of my screens without digging out the documentation. 

 Without check the manf data you'll never really know if the card is
 outputing the maximum resolution of the display.  A simple google  
 search
 of the model number yielded a screen resolution of 1680 x 1050.


Thanks both you and PeterH. It looks like it is throwing up what I am  
calling the native res of the screen and I have changed to 1280 x  
1050 and it looks fine. (It will do. But my thoughts are turning to  
bigger and better screens now that I have this fancier card).

When you put the computer to sleep or the display to sleep (when it  
goes blank, not just screensaver) I assume the fan on the graphics  
card stops in both of these situations?

--
dorayme




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Re: Native resolution of LCD monitors?

2009-05-16 Thread Paul

On May 16, 3:41 pm, PeterH peterh5...@rattlebrain.com wrote:
 On May 16, 2009, at 1:05 PM, Paul wrote:

  Many, if not all, LCD monitors have a single best resolution and
  frequency.

 Many, if not all, monitors of ANY TYPE have a single best resolution  
 and frequency, moreso with CRTs than with LCDs, however.



I've usually gotten a very good picture using more than one resolution
on a CRT, but I haven't yet found more than one clean-looking
resolution on an LCD monitor. With an LCD, I think what they do is
cluster a few pixels into one to handle anything less than the maximum
resolution. That makes the view somewhat fuzzy.
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Re: Native resolution of LCD monitors?

2009-05-16 Thread Paul

One way to tell if the fan stops is to open the case and take a peek.
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Re: Native resolution of LCD monitors?

2009-05-16 Thread Clark Martin

PeterH wrote:
 
 On May 16, 2009, at 1:05 PM, Paul wrote:
 
 Many, if not all, LCD monitors have a single best resolution and
 frequency.
 
 Many, if not all, monitors of ANY TYPE have a single best resolution  
 and frequency, moreso with CRTs than with LCDs, however.

Other way around.  CRTs have no inherent resolution, LCDs.  LCDs have an 
exact number of pixels, x and y.  CRTs can display pixels over a wide 
range and frequently their highest possible resolution isn't their best 
resolution.  And which resolution is best is dependent the user.


-- 
Clark Martin
Redwood City, CA, USA
Macintosh / Internet Consulting

I'm a designated driver on the Information Super Highway

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Re: Native resolution of LCD monitors?

2009-05-16 Thread Clark Martin

dorayme wrote:
 From: Clark Martin


 dorayme wrote:
 At long last, I got a better card than the original that came with my
 QS 933, clearing the way for me to get a bigger screen.

 But one thing that is puzzling is how to find out the native
 resolution of my screens without digging out the documentation. 

 Without check the manf data you'll never really know if the card is
 outputing the maximum resolution of the display.  A simple google  
 search
 of the model number yielded a screen resolution of 1680 x 1050.

 
 Thanks both you and PeterH. It looks like it is throwing up what I am  
 calling the native res of the screen and I have changed to 1280 x  
 1050 and it looks fine. (It will do. But my thoughts are turning to  
 bigger and better screens now that I have this fancier card).
 
 When you put the computer to sleep or the display to sleep (when it  
 goes blank, not just screensaver) I assume the fan on the graphics  
 card stops in both of these situations?

The fan will definitely stop when the computer is asleep.  I don't think 
it would stop when the display is asleep.  While the display isn't 
showing anything the video card is still processing information and 
putting pixels in the display buffer.

-- 
Clark Martin
Redwood City, CA, USA
Macintosh / Internet Consulting

I'm a designated driver on the Information Super Highway

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Re: Native resolution of LCD monitors?

2009-05-16 Thread PeterH


On May 16, 2009, at 8:43 PM, Clark Martin wrote:

 CRTs have no inherent resolution ...

Sure they do.

They either have one and only one horizontal sweep frequency and one  
and only one vertical sweep frequency, or they have sets of  
horizontal and sets of vertical sweep frequencies which are detected  
by the interface and automatically switched by adding or deleting  
resonant elements, usually capacitors, to select the new frequencies.

There is a limited capture range for each set of frequencies.



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Native resolution of LCD monitors?

2009-05-15 Thread dorayme

At long last, I got a better card than the original that came with my  
QS 933, clearing the way for me to get a bigger screen.

But one thing that is puzzling is how to find out the native  
resolution of my screens without digging out the documentation. There  
seems no Mac software that tells this? I have a feeling that one of  
my screens is 1600 by 1080 but this is not quite one of the  
possibilities showing up from the new card. Close is 1600 by 1024,  
sure looks fine but it would be nice to be exactly right. I must say,  
the colours look so much better with this new card with its little  
fan! And being a true Mac card, I might even have a go at using the  
sleep function sometime.

I run two monitors off this card:

ATI Radeon 9800 Pro:

   Chipset Model:   ATY,R350
   Type:Display
   Bus: AGP
   Slot:SLOT-1
   VRAM (Total):128 MB
   Vendor:  ATI (0x1002)
   Device ID:   0x4e48
   Revision ID: 0x
   ROM Revision:113-A07525-130
   Displays:
DELL SP1908FP:
   Resolution:  1280 x 1024 @ 60 Hz
   Depth:   32-bit Color
   Core Image:  Supported
   Mirror:  Off
   Online:  Yes
   Quartz Extreme:  Supported
VA2026w:
   Resolution:  1600 x 1024 @ 60 Hz
   Depth:   32-bit Color
   Core Image:  Supported
   Main Display:Yes
   Mirror:  Off
   Online:  Yes
   Quartz Extreme:  Supported

Anyone know if there is a technique to discover *native res* of the  
monitors. Do the monitors not supply the info somehow to the OS?

Perhaps I might need to get software from the card manufacturer's  
website. I recall the twin turbo software from that old chestnut card  
on my 7300, able to deliver different resolutions...

--
dorayme




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Re: Native resolution of LCD monitors?

2009-05-15 Thread PeterH


On May 15, 2009, at 9:35 PM, dorayme wrote:

 But one thing that is puzzling is how to find out the native
 resolution of my screens without digging out the documentation. There
 seems no Mac software that tells this?

On a modern card connected to a modern monitor, the software reads  
the monitor which returns its various resolutions and maximum  
frequencies.

These resolutions and frequencies are presented as options in the  
Displays control panel.

If a particular resolution or a particular frequency is not shown, it  
is not supported.

Usually, you are given nearly all of the usual suspect resolutions,  
but not necessarily all of the frequencies.

On my present monitor, a 23 LCD, I am given up to 1920 x 1200, bit  
this resolution is a tad unstable on the right side, so I back down  
to 1680 x 1050, and at 1680 x 1050 I am given the frequency options  
of 56, 59 and 60 Hz. I selected 60 Hz.

The corresponding About This Mac ... data is:

ATY,Rage128Pro:

   Chipset Model:   ATY,Rage128Pro
   Type:Display
   Bus: AGP
   Slot:SLOT-1
   VRAM (Total):16 MB
   Vendor:  ATI (0x1002)
   Device ID:   0x5046
   Revision ID: 0x
   ROM Revision:113-72701-130
   Displays:
MB24W:
   Resolution:  1680 x 1050 @ 60 Hz
   Depth:   32-bit Color
   Core Image:  Not Supported
   Main Display:Yes
   Mirror:  Off
   Online:  Yes
   Quartz Extreme:  Not Supported

Bottom line: there are a number of native resolutions, and within  
each, there are a number of native frequencies.



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Re: Native resolution of LCD monitors?

2009-05-15 Thread Clark Martin

dorayme wrote:
 At long last, I got a better card than the original that came with my  
 QS 933, clearing the way for me to get a bigger screen.
 
 But one thing that is puzzling is how to find out the native  
 resolution of my screens without digging out the documentation. There  
 seems no Mac software that tells this? I have a feeling that one of  
 my screens is 1600 by 1080 but this is not quite one of the  
 possibilities showing up from the new card. Close is 1600 by 1024,  
 sure looks fine but it would be nice to be exactly right. I must say,  
 the colours look so much better with this new card with its little  
 fan! And being a true Mac card, I might even have a go at using the  
 sleep function sometime.
 
 I run two monitors off this card:
 
 ATI Radeon 9800 Pro:
 
Chipset Model: ATY,R350
Type:  Display
Bus:   AGP
Slot:  SLOT-1
VRAM (Total):  128 MB
Vendor:ATI (0x1002)
Device ID: 0x4e48
Revision ID:   0x
ROM Revision:  113-A07525-130
Displays:
 DELL SP1908FP:
Resolution:1280 x 1024 @ 60 Hz
Depth: 32-bit Color
Core Image:Supported
Mirror:Off
Online:Yes
Quartz Extreme:Supported
 VA2026w:
Resolution:1600 x 1024 @ 60 Hz
Depth: 32-bit Color
Core Image:Supported
Main Display:  Yes
Mirror:Off
Online:Yes
Quartz Extreme:Supported
 
 Anyone know if there is a technique to discover *native res* of the  
 monitors. Do the monitors not supply the info somehow to the OS?
 
 Perhaps I might need to get software from the card manufacturer's  
 website. I recall the twin turbo software from that old chestnut card  
 on my 7300, able to deliver different resolutions...

Without check the manf data you'll never really know if the card is 
outputing the maximum resolution of the display.  A simple google search 
of the model number yielded a screen resolution of 1680 x 1050.


-- 
Clark Martin
Redwood City, CA, USA
Macintosh / Internet Consulting

I'm a designated driver on the Information Super Highway

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