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Pixel calculation (please help me understand)

Discussion in '101 Display Basics' started by Jarrad, Mar 11, 2019.

  1. Jarrad

    Jarrad I find your lack of Pixels Disturbing

    Dec 28, 2018
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    Busselton WA
    Now this is the part of school i wished i had paid attention a bit more,
    im not getting the hang of calculating how many lights are in 100 nodes.
    so lets have a look at s string of 100 Bullet pixels, is it 100 x 3 =300? so for argument sake a pixel tree of 16 strings would then be 100x3x16= 4800?
    yes its a bit of a stupid question i know and it was covered elsewhere i just feel like im missing something in the calculations.
    go nuts people and explain it to me if the above is wrong, help is always appreciated.
  2. keithsw1111

    keithsw1111 Full Time Elf

    Oct 11, 2012
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    Kellyville, NSW
    Find Me On:
    distinguish between pixels/nodes (which can be used interchangeably) and channels. There are 3 channels per pixel/node. Read the labels carefully because depending on the situation they ask for different things.
  3. MD389

    MD389 New Elf

    May 31, 2018
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    As @keithsw1111 mentioned pixels generally have 3 cahnnels per pixel / node. So in your example you would have 1600 pixels/nodes with a total of 4800 channels.
  4. videoman3857

    videoman3857 Full Time Elf

    Apr 21, 2016
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    Glass House Mountains
    Not a stupid question and is confusing when you first start out.
    Pixels are smart. Nodes are dumb.
    There are RGB LEDS in a single light unit.
    If you have 16 strings of nodes (dumb RGB) you have 16 strings x 3 channels (RGB) (48 Channels) The LEDS on each string all illuminate at the same time. - ie 100 x blue.
    If you have 16 strings of pixels (smart RGB) you have 16 Strings x 3 channels x 100 "lights" (480 channels) Each "light" is programmable to be on , off, or whatever colour you want it to be.

    The difference - Dumb RGB - The whole string illuminates the same colour. The whole string is either on or off
    - Smart RGB - The whole string can be multiple colours throughout - can turn any of the 100 "lights" on or off.
    Tom Zheng likes this.
  5. algerdes

    algerdes Al Gerdes

    Nov 29, 2012
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    Lebanon, Illinois
    There is a real good reason to be asking this question right now. Our standard pixel, today, has 3 LEDs in the package. One red, one green, one blue. It takes a channel to control each of these colors. Hence the statement that it takes 3 channels per pixel/node.

    As pixel/node technology gets farther down the road, we are starting to see some pixels that have 4, 5, 6 or more LEDs per pixel/node. Not only our current Red, Green, Blue, but also Violet, Amber, actual White (not the blended we do to make white) and others. For each of these LEDs that are added to the pixel/node package, another channel must be assigned. I have some pixels I'm using for some stage work where it takes 6 channels for each pixel/node. I don't see this coming to DIYC any time soon, but the R,G,B,W or R,G,B,A versions are just around the corner for some of us.

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