Display warping with pixel grids.
Author
Heya -- I was adding a graphical layer to the background of a simple game I was programming..
It consisted of a gridwork of pixels, that alternated between black and white.. ie. like a chessboard, where each black and white square is the size of one pixel.
For some reason the image was warping when it was displayed, like an oil+water effect.. there was slight colour distortion that came through in onion-skin like ripples.
Just out of curiosity.. does anyone know what could be causing this -- the refraction of the light coming through the monitor glass perhaps ?
- Scutt.
it is an optical illision. It is the way the human brain works in "decoding" optical senses - ie what you see.
Lots of images do this, some are spirals, some are a bunch of squares, horizontal lines looking bulgy in the middle.
The colours are from the way the light waves reach the eye.
Ofcourse there is another option when using computers - you are using a tube, not a TFT, so your screen is actually bulging outwards.
The colour is because you are using a tube and it isn''t aligned properly.
If it is digital you may be able to adjust it with the controls - otherwise you need to adjust the trim pots in the back of the case. If you have no idea how to do this DO NOT try it. Go and get a shop to do it.
Beer - the love catalyst
good ol'' homepage
Lots of images do this, some are spirals, some are a bunch of squares, horizontal lines looking bulgy in the middle.
The colours are from the way the light waves reach the eye.
Ofcourse there is another option when using computers - you are using a tube, not a TFT, so your screen is actually bulging outwards.
The colour is because you are using a tube and it isn''t aligned properly.If it is digital you may be able to adjust it with the controls - otherwise you need to adjust the trim pots in the back of the case. If you have no idea how to do this DO NOT try it. Go and get a shop to do it.
Beer - the love catalyst
good ol'' homepage
side note - if you are using a TFT/LCD screen, it is because you aren''t using the maximum resolution.
Beer - the love catalyst
good ol'' homepage
Beer - the love catalyst
good ol'' homepage
argh! not!
its no optical illusion, and its not any LCD effect.
its a CRT effect and comes from the "mask" of the CRT.
there are 3 rays fired that "scan" the display line-by-line (hence the word scanline
).
to "guide" these rays to their corresponding spots of red, green and blue phosphor, a "mask" (sheet of very thin perforated metal) is inserted just before the "screen".
the holes in this mask make sure
since the "switching from one pixel-color to the next" that the graphics-card does is in no way synchronized with the occurance of the holes in the mask, and usually 1.3 or so holes cover one "pixel" from the gfx-card AND the "convergence" is not perfect on any CRT AND the R, G and B spots dont move "out of sight" for the triple-ray-beam, this effect is visible.
thats all.
buy a better CRT, one from EIZO maybe, or push resolution down to 640x480 and the effect will disappear.
--- foobar
We push more polygons before breakfast than most people do in a day
its no optical illusion, and its not any LCD effect.
its a CRT effect and comes from the "mask" of the CRT.
there are 3 rays fired that "scan" the display line-by-line (hence the word scanline
).to "guide" these rays to their corresponding spots of red, green and blue phosphor, a "mask" (sheet of very thin perforated metal) is inserted just before the "screen".
the holes in this mask make sure
// this is "source" just to get me spaces and fixed-font ;)*------------- "red" ray|| *-------- "green" ray| || | *--- "blue" ray| | |V V V\ | / \ | / \ | / ---> the 3 rays are moving in this \ | / direction, this is just a "moment capture" \|/##### ######### ### - this is the "mask" /|\ B G R B G R - these are the "phosphor spots" (current) (next ) (pixel ) (pixel) etc. since the "switching from one pixel-color to the next" that the graphics-card does is in no way synchronized with the occurance of the holes in the mask, and usually 1.3 or so holes cover one "pixel" from the gfx-card AND the "convergence" is not perfect on any CRT AND the R, G and B spots dont move "out of sight" for the triple-ray-beam, this effect is visible.
thats all.
buy a better CRT, one from EIZO maybe, or push resolution down to 640x480 and the effect will disappear.
--- foobar
We push more polygons before breakfast than most people do in a day
This topic is closed to new replies.
Advertisement
Popular Topics
Advertisement
