Color TV Day 2024 is on Tuesday, June 25, 2024: What is the difference between white colour in TV and that of Day (the Sun light)?

Tuesday, June 25, 2024 is Color TV Day 2024. Holidays of June, Today in 1951, the CBS network broadcast the ... Click to view Hi-Res version.

What is the difference between white colour in TV and that of Day (the Sun light)?

They appear to be the same although the colours are actually quite different.

Our colour vision is the result of us having three sets of colour receptors (cones) in the eye. This means that all the colours we see come from just three stimuli in the eye. By combining red, green and blue lights in the right proportions then we can make a light that produces exactly the same three stimulus values as daylight. (Daylight's technical name is D65.) That means that the eye sends the same signal to the brain when it sees the correct mixture of red, green and blue as it does when it sees the full spectrum of D65.

This is purely a consequence of the way we humans are constructed. Many birds have four sets of colour receptors giving them better colour vision than us. This means that if a bird looks at a TV then all the colours will be wrong. Dogs and cats have only two types of colour receptors - they are partially colour blind. Because the TV has more colours then dogs and cats will see colours on TV about right. However since the colours on TV are adjusted for human vision then the chances are that they will be slightly off for dog vision.

There is a bit more complication. We use D65 as the standard daylight. Real daylight is actually variable. In the polar regions or at the summit of a high mountain then daylight is nearer D75. In the tropics daylight is nearer D60. In India noon daylight is slightly redder than D65. Also the colour of daylight changes during the day. At dawn or dusk the light is around D50 During the morning the light gets steadily more blue until it reaches D65 around noon. (These D numbers represent various colours whose spectral distributions are defined as international standards. The lower the number the redder the light.)

You may also notice a difference in the colour of light that shines into a north facing and a south facing room.

We don't see these changes in white light because our eyes adapt. Whatever light is illuminating a room will appear to be white. This is important because individual TV manufacturers use different red, green and blues phosphors in their screens. So the TV broadcaster transmits a standard picture but the television receiver displays it slightly differently. However because our eyes adapt, we see television white as pure white even though the actual colour may be slightly bluer or slightly yellower than real white.

Anyone know about big screen tvs?

Anyone know about big screen tvs?

Most of the time, color issues can be fixed with minimal effort. These problems are sometimes not caused by the television itself, but the peripherals plugged into it. For most projection screen TVs, you can try replacing the bulb if the colors are dark, or if it seems like there are shadows on parts of the screen. There should be information on the location of the bulb in your owner’s manual or on the back of the television set itself. Your manual should also include step-by-step instructions on how to replace it. Note that bulbs can run upwards of a hundred dollars. But depending on your television’s age and size, it could be less expensive to replace the part than to purchase a new television altogether.

Some sets have service menus that can be accessed with the remote control, but keep in mind that service information is a virtual necessity, as it is extremely easy to foul things up to the point of inflicting permanent damage to your television set. If your set has this feature, the service manual will contain instructions on how to properly use it. If your television requires the use of a computer interface, you may as well give up on the idea of adjusting the internal color settings yourself (unless you happen to know of a shop that will loan you an adapter and instruct you on how to use it). If you do find someone willing to loan you the equipment, it is likely they are doing so because they know you will have to bring your set in anyway and have them help you to unscramble the mess you made.

If your television has no color at all, make sure the source of the image is in color (i.e., not a black and white movie). Next, check your color settings. Sometimes these settings are changed by mistake, whether caused by a child who may have done something to the remote or someone simply pressing buttons without realizing they had changed the settings. If your set has an automatic picture mode, try turning it off and adjusting the color manually. The best way to do this is to turn all options all the way down, and begin adjusting from there. Be aware that color, brightness and contrast are alll interrelated, so you may need to adjust each of these functions a bit. Be sure to use a good image source to make your adjustments, such as a movie or show that you watch often. Adjust the color first to suit flesh tones, and then fine-tune it to get the best color. Also check your connections to make sure a loose cable is not the cause of the problem.

Most of the time, color tubes will not go bad. You should try troubleshooting other potential causes before replacing that part. Sometimes a defect in the tuner can cause a loss of signal strength, which can affect the color. You may also check for defective parts around the chroma chip or circuit, such as the color oscillator. If the chroma chip itself is faulty, be prepared for an expensive fix. Faulty connections in this area will wreak havoc with picture color.

If you are still having problems with your tv losing its color and are unable to accurately diognose the problem yourself, you may need to contact an electronics specialist or repair person.

Who really invented color tv?

Who really invented color tv?

Yes, you are correct. It was John Logie Baird who invented color television.

"John Logie Baird FRSE (13 August 1888 – 14 June 1946) was a Scottish engineer and inventor of the world's first practical, publicly demonstrated television system, and also the world's first fully electronic colour television tube. Although Baird's electromechanical system was eventually displaced by purely electronic systems (such as those of Vladimir Zworykin, Marconi-EMI and Philo Farnsworth), Baird's early successes demonstrating working television broadcasts and his colour and cinema television work earn him a prominent place in television's invention. In 2002, Logie Baird was ranked number 44 in the list of the "100 Greatest Britons" following a UK-wide vote] In 2006, Logie Baird was also named as one of the 10 greatest Scottish scientists in history, having been listed in the National Library of Scotland's 'Scottish Science Hall of Fame'. The "Baird" brand name was first owned by Thorn-EMI and was sold off to a small Chinese manufacturer when Thorn-EMI was dissolved."

Have a pleasant day.

Holidays also on this date Tuesday, June 25, 2024...