Dad Jokes (let's hear your worst! ;-)

[Hedges]

Black is the absence of color.
White is the presence of all colors together.

Then how come my CRT has only three colors of phosphor, three characteristic spectral lines?




Blackness is nothingness, Whiteness is everything? <runs for cover>

 

[SeaGal]

More Dad Jokes. less chit chat.

OK, I'll guide it back whilst keeping with the theme...

What happens when you throw a white hat into the Black Sea?

Spoiler

It gets wet

 

[Supervstech]

Whats black and white and red all over?

Spoiler

a newspaper at a mob hit

 

[wattmatters]

As I was about to be put under before my last operation, I told the surgeon I wanted to do my own wound stitching.

They said to me

Spoiler

Suture self

 

[JoeHam]

More Dad Jokes. less chit chat.

Why couldn’t the duck stop chit chatting ?

Spoiler

Because it was addicted to Quack

 

[Tulex]

It's not a joke without a punchline.

Because it was addicted to quack.

 

[Tulex]

So this duck walks into a drugstore and asks the clerk for a tube of lip balm.
"Will that be cash, sir? asks the clerk.
“No,” the duck replies. “Just put it on my bill.”

 

[JoeHam]

It's not a joke without a punchline.

I was looking up how to do the spoiler thing at the minute you saw it

 

[SeaGal]

Whats black and white and red all over?

That one only really works verbally though

 

[Recovering EE]

Then how come my CRT has only three colors of phosphor, three characteristic spectral lines?

View attachment 295345


Blackness is nothingness, Whiteness is everything? <runs for cover>

You folks are both right, but are talking light vs pigment.

With luminous sources of light (like from an LED bulb), the primary colors are Red, Green, and Blue. The combination of all three gives white light. The absence of light is black.

With reflected light (like off of illuminated pigments), the primary colors are Yellow, Cyan and Magenta. The combination of the primary pigment colors gives Black. The absence of pigment gives White.

The way primary pigments get their color is that they absorb the primary light colors, and reflect what's left:

Yellow pigment absorbs the Blue primary color of light, and reflects Red and Green light. The combination of Red and Green light is Yellow.
Cyan pigment absorbs the Red primary color of light, and reflects Blue and Green light. The combination of Blue and Green light is Cyan.
Magenta pigment absorbs the Green color of light, and reflects Red and Blue light. The combination of Blue and Red light is Magenta.

Note that this is from a Physics perspective, and has its basis in the fact that the human eye has Rods and Cones. Rods detect light in monochrome. Cones detect light in color, and there are three types of cones...those that detect Red light, those that detect Blue Light, and those that detect Green light. The brain combines them into all the visible colors that we perceive.

 

[Hedges]

I understand difference between mixing pigments that absorb some wavelengths, vs. sources that emit.

My point is, RGB phosphors are not full spectrum. They produce three spectral peaks (some wider than others in the image I grabbed.)

I don't think RGB CRT actually produces white light (e.g. in fluorescent tubes or LED bulbs, as well.)
However, our retina has three colors of pixel receptors, correct? Presented with white light, it notes relative intensity of the three receptors and our mind things it sees white. Whether actually due to full spectrum light, or due to three narrow peaks.

Is that correct? Our eye can't actually tell if all the colors are present, or it is being faked?

 

[Tulex]

I just found out I'm color blind.

The diagnosis came completely out of the purple.

 

[Recovering EE]

I understand difference between mixing pigments that absorb some wavelengths, vs. sources that emit.

My point is, RGB phosphors are not full spectrum. They produce three spectral peaks (some wider than others in the image I grabbed.)

I don't think RGB CRT actually produces white light (e.g. in fluorescent tubes or LED bulbs, as well.)
However, our retina has three colors of pixel receptors, correct? Presented with white light, it notes relative intensity of the three receptors and our mind things it sees white. Whether actually due to full spectrum light, or due to three narrow peaks.

Is that correct? Our eye can't actually tell if all the colors are present, or it is being faked?

If the phosphors are truly Red, Green and Blue, one can mix and vary the intensity of each to achieve all the colors of the visible spectrum.

The same is true of Yellow, Cyan and Magenta pigments.

What's interesting is to display a multi-color test image on a CRT, and look at the screen areas with a magnifier. White areas have all three phosphors (Red, Green and Blue) brightly lit up. Other colors have the phosphors lit up with varying intensity, depending on color. This effect can also be seen with other display technologies, but color CRTs seem to work best. Try it!

 

[Tulex]

And for you Canadians/Brits...

A Canadian found out he is colour blind.

The diagnosis came completely out of the grey.

 

[Delmar]

Today I went for a job interview today at IKEA. The manager said: "Come in, make a seat."

 

[SeaGal]

My point is, RGB phosphors are not full spectrum. They produce three spectral peaks (some wider than others in the image I grabbed.)

I don't think RGB CRT actually produces white light (e.g. in fluorescent tubes or LED bulbs, as well.)
However, our retina has three colors of pixel receptors, correct? Presented with white light, it notes relative intensity of the three receptors and our mind things it sees white. Whether actually due to full spectrum light, or due to three narrow peaks.

Is that correct? Our eye can't actually tell if all the colors are present, or it is being faked?

RGB will appear as vaguely white to the human eye, but it is not true white light. Its colour rendering index is not 100, so other (coloured) things will look less bright and vibrant when illuminated by RGB.

 

[HRTKD]

Back to actual Dad Jokes...

 

[Delmar]

Your fingers have fingertips but your toes don't have toetips. Yet you can tiptoe but not tipfinger.

 

[Delmar]

I've combined a laxative with alphabet soup. I call it...

Spoiler

letter rip