Questions tagged [color]

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How to differentiate which cables is which if there is no color codes [migrated]

Apologies in advance if I am in the wrong forum. I am trying to change my ceiling lamp to ceiling lamp with fan. However, when I took the ceiling lamp off, I see that the cables have the same color so ...
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RGB LED Color Calibration to D65

I am trying to determine resistor values to set the forward current per color of an RGB LED. I would like to achieve approximate D65 (daylight white) when all LED channels are driven at maximum ...
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2 answers
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Why does pixel binning remove colors and provide monochrome image only with CMOS color cameras?

Some industrial cameras (astrophotography or microscopy) offer a hardware digital "binning" feature. Indeed, sending uncompressed 10 megapixels x 3 RGB bytes per pixel x 30 frames per second ...
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Convert RGB to the composite video / S-video (math)

I used to do it in circuits with CXA1645 or AD725. But this question is not about soldering, it is about math and digital processing. Imagine I am designing the entry-level graphics processor using ...
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2 votes
3 answers
166 views

How do bicolor LEDs switch colors?

I recently purchased a decorative light with two different bicolor LEDs connected in alternating series fashion. It has red/green and red/blue LEDs connected in alternating series On the driver side ...
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7 answers
3k views

RGB spectrum of an RGB LED [closed]

What colors is an RGB LED actually able to emit? Obviously, it's not able to represent the whole spectrum of RGB (it will not be black, or brown). I'm referring to a LED like this: I found the ...
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Driving R/G LEDs using constant current driver

I want to use the Texas Instruments TLC5917 LED driver to drive bi-colour LEDs. The TLC5917 is constant current, and has 8 channels, so that would make it possible to drive 4 units of two-colour LEDs. ...
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2 votes
4 answers
151 views

Is the luminous efficiency of a 5000 K incandescent greater than that of a 3000 K bulb?

The color temperature represents the color of light emitting from an ideal black body, when heated to said temperature in kelvin, and how an incandescent bulb emits light is close to a black body. ...
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3 answers
3k views

My DIY RGB LED panel powered by 9V battery works but certain colors like blue, white, and purple don't work

I am able to power on my LED unit here with a 9V battery. I'm using a recharble lithium 9V as well. I can't figure out why I can't get blue, purple, and white. The only colors I get are red, orange, ...
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1 answer
183 views

Wire color standards for a reversible DC motor [closed]

I'm working on a project with a DC motor that runs in both directions. If the motor ran only in one direction, I'd use red/black for positive and ground, but as they reverse, there isn't a consistent ...
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Color Sensor Range

From what I've seen in spec sheets for modern color sensors (as of late 2020), the optimum sensing range is generally on the scale of centimeters. I am curious about the physics that can explain this ...
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1 answer
715 views

Why does color of addressable RGB LED strip change when dimming?

TL;DR I have an addressable LED strip with TM1814 IC's. (So it's actually a RGBW strip. Download datasheet here.) When set to orange at full brightness, it's orange. But when set to orange at 10%, it ...
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2 votes
1 answer
345 views

Analog video chrominance decoding - PAL/NTSC

I'm implementing an analog video decoder on FPGA. I find some difficulties during chrominance decoding. I appreciate if you can help me. These are the steps as I'm doing: I generate an NTSC ColorBar ...
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Headphone Jack wire coding is different

I recently opened my headphone jack because one side of headphones wasn't working There are 6 wires basically Dark green, dark blue, yellow, red and two copper wires Please help which wire should I ...
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Consistency Concerns Between Series RGB LEDs in a String

My concern/question: If one has a string of series RGB LEDs (w/ independent elements) and was to light green to 100% and red to approximately 75% -- in an effort to illuminate the Amber color -- how ...
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2 votes
1 answer
345 views

Calculate RGB color ratio for a color space given a white point?

I am new to the field of displays and color science. I am trying to calculate RGB color ratio for NTSC color space using D65 white point. Can anyone point me to a good reference on it or how I can do ...
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1 vote
1 answer
238 views

HP C8941 Photosensor wire colors

I removed a photosensor from an OLD hp Inkject Printer. The photosensor is called "C8941-80018". I can't find any datasheet online. Does anyone know what wire color is what?
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11 votes
2 answers
900 views

Image position and size controls vs beam alignment in a color CRT

If you look at a the shadow mask of a color CRT, you can have a pattern like this: Most TVs were purely analog and had knobs to move the picture horizontally and vertically. How does the green gun ...
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