Re: OT: Sirius rising on my new TFT screen!

chris.b@xxxxxxx wrote: 
Thanks for all the input gentlemen. :-)

I've now set it to 1280 x 1024 as recommended. This shows 80Hz x 75Hz
and "analogue input" in the screen menu.

How on earth do I get a digital input if it only accepts a 15-Pin
D-plug? 

Chris.B




Cris:

Get a VGA (port) to DVI (monitor) cable adapter. Make sure that you get the correct M/F pin in/out configurations. Electronically, the cable conveys to the monitors what the video display adapter card sends out from its ports. Forget digital and analog terms. E.g., if you changed settings to select a VGA 8 bit color display IBM monitor setting while retaining your high res. monitor, you would be able to only display 8 specific colors on screen at ultra low res. Set your display adapter card program, say through <start><control panel><display><settings><advanced monitor>, to select your correct monitor, or get a driver for it from the monitor or card mfr. That will maximize the potential of your equipment.

CRTs that have a triangulated round dot shadow mask, instead of the rectangular slot shadow masks, show pictures and rounded text forms better.
Also better than the square pixels of the TFT screens. The colors available on the TFT screens has improved, and they are now up to the CRTs in color quality. CRTs are not out of the game yet for high end use.

BTW, if you have never seen an SGI 21" CRT monitor that can display 9000 by 8000 pixels on screen you haven't seen nothing. TFTs have a long ways to go to match that. Really fine and smooth and rock steady images.

The display adapter card controls the factors of image quality. The number of on-board display RAM transistors is finite.

Math: Call the total number of display RAM electronic memory transistors (not displayed pixels on screen, which are totally different things) times a coefficient =X.

X= the product of (the number of electronic memory pixels that can be assigned to the screen file, or electronic resolution)*(the frequency or number of screen frames per second non-interlaced in Hz)*(the number of displayable colors for each pixel created in the memory assigned to the screen file, say , in terms of color depth of say 8, 16, 24, or 32). That tells you what the board can display. [* is times.]

If you increase the refresh frequency rate to 85Hz from 60Hz you will have to give up a proportionate amount of either RAM transistors assigned to the screen file, say to 706 instead of 1000 electronic pixels, or suffer a proportionate reduction in number of bits of color information assigned to each electronic pixel. There are the three parameters that govern the appearance of the display.

RAM is usually specified in 'blocks' of 1080 transistors. The product of the width and height of the specified screen file that is sent to the monitor for display is always a multiple of 1080 RAM transistors.

Don't send your monitor a faster refresh rate than its maximum. That, on some monitors can cause damage. In fact, in order to gain electronic pixels in the resolution or screen pixel size category, turn down the refresh rate to a lower rate. You are dealing with still images, and speed of fusion doesn't matter. You want to set your display adapter card to display 24 or 32 bits of color depth. The two numbers mean the same, only that the 32 bit specification does include the always present 8 control bits.

Office monitors often can display a maximum of 255 colors per displayed screen pixel, or 255 gray values. That is 16 bit color. Putting in a high res, high refresh rate, 32 bit display adapter card won't improve matters.

Both the high res. video display adapter card and the high res. monitor should display the full 32 bit colors per pixel. The significance of that is that the total number of combinatorial colors that are displayable on screen will be more than 4.1 million colors at each pixel. Not 255, and not 12 color gradation steps. That is the cube of 255. In 32 bit color there are a total of 255 possible gradations for each of the 3 RGB hues. Astronomers will want those subtle values possible to high res, full 32 bit setups. Many new computers have that type of performance, but you have to check the loss leaders.

In high res. video display cards you don't need a 3D card for 2D imaging. The 2D cards are sufficient, and you can get the high res. 32 bit color at lower cost. The specs. for high millions of rendered triangles per second are specific to 3D, CAD, modeling, rendering, and games. High res. 2D cards work just fine if you don't need 3D and rendering. Check with the card and monitor Mfrs. to see what size resolution can be displayed. Some monitors are more capable and the performance can be improved with a nice 2D high res. card at low cost.

For those that can, turn off the full-screen always-on anti-aliasing. It greatly slows the downloads and displays of everything.

Ralph Hertle


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