Kako projektori projiciraju crno (jednostavno objašnjenje)
Kao što ste naučili na satu prirodoslovlja u petom razredu, crna zapravo nije odraz svjetlosti, već odsutnost bijele. Dakle, kako projektori projiciraju crnu boju na ekran?
Projektori ne moraju odbijati svjetlost da bi projicirali crnu boju na platno. Način na koji projektori projiciraju crno je tako da ga uopće ne projiciraju. Tehnički, projektori ne projiciraju crnu boju.
Također pročitajte:Hoće li projektor raditi na sivim ili crnim zidovima?
Jesi li zbunjen? U ovom članku raspravit ćemo o ironiji projekcije crne boje i o tome kako crnu boju vašeg projektora možemo učiniti još crnjom.
Pogledajte moje najbolje preporuke za projektore.
Kako projektori projiciraju crno (projiciraju li?)
Kao što smo već spomenuli, da bi projektori projicirali natrag, neće ih uopće morati projicirati. To znači da će crna boja svakog projektora značajno varirati s različitim čimbenicima.
Kasnije ćemo razgovarati o tome kako stvoriti bolje crne za vaš projektor. Za sada idemo dublje i duboko zaronimo u to kako vaš projektor stvara crnu boju ili iluziju crne.
Kako vidimo boju?
Jeste li ikada razmišljali o tome kako naše oči upijaju boju i zašto su neki predmeti crveni, a neki plavi? Pa, sve počinje sa znanošću o bijeloj svjetlosti.
Bijelo svjetlo je rezultat kombinacije svih boja vidljivog spektra boja.
Zbog ovog svojstva bijele boje, možemo pretpostaviti da bijela svjetlost sadrži sve boje (osim crne, koja tehnički nije boja nego nijansa).
Kada bijela svjetlost udari u predmet, taj predmet je ili reflektira ili apsorbira. Boja se reflektira i ne apsorbira u boji koju vidimo.
Kada vidimo crvenu boju u jabuci, tehnički ne vidimo crvenu boju u jabuci, već crvenu boju koju reflektira jabuka.
Jabuka upija sve boje bijelog svjetla osim crvene, stoga čunjići u oku (tri vrste očnih čunjića:plavi, zeleni i crveni) koji su zaduženi za otkrivanje crvenog svjetla šalju signale vašem oku-mozgu da vidi crveno.
Dakle, u osnovi, kada vidimo crvenu jabuku, crveno nije zapravo unutar jabuke, već je to boja koju jabuka ne reflektira (tako da tehnički, jabuka nije crvena, ali jabuka reflektira crvenu boju).
Projekcija crne boje
Kad čujete da su crni suprotni bijelom, tehnički su točni! Ako je bijela kombinacija svih boja, crna je odsutnost svih boja, a to se događa kada se sva svjetlost apsorbira, a nijedna se ne reflektira.
Budući da se projektori temelje na svjetlu, ne mogu projicirati nijansu koja predstavlja odsutnost svjetla. To bi bilo ne samo ironično, već i znanstveno nemoguće. Zbog toga projektori ne projiciraju crnu boju kako bi pojednostavili stvari.
Zašto je odnos projektora i crne kompliciran
Budući da projektori ne projiciraju crnu boju, crna boja koju vidite na projekciji uvelike se oslanja na mnoge varijable. Improving the contrast of your projector is something we will tackle later.
In this section of the article, however, we will tackle the variables that affect the color black color in projectors.
The human eyes are a complicated pair of flesh. They are not only very intricate, but together with the brain, they fill their physical limitations with the brain’s cognitive abilities (just like how smartphones have AI post-processing built-in on their cameras).
Our eyes see colors relative to the colors in proximity to them. It means that if a very dark color is put on a sea of white, it may seem even darker than it is. Take the image below as an example.
Image credits:Public Domain, Christopher S. Baird
Notice the two spaces surrounding the dots on the image. Although one seems lighter and the other seems darker, both are the same hue.
Now you may ask how this applies to projectors specifically. If the projected image contains blacks surrounded by many lighters, vibrant colors, it may seem dark. However, if the projected image’s black images are next to relatively dark images, it may not seem dark.
The surface is essential.
Since blacks on a projector are not reflected, the blacks on projected images will vary significantly concerning their projected surface.
It means that if a projector projects at a highly light surface, the black may not be very black as expected. On the contrary, if the projector projects at something dark like a black-painted wall, the blacks will be extremely dark.
For reference, let us refer to the image below. Ideally, a projector would project perfect blacks like the image on the left.
However, in practice, most projector’s blacks will largely depend on how the projected surface looks and will look like the one projected on the right.
Image credits:Public Domain, Christopher S. Baird
The mystery of black:how does a projector make black?
Sadly, a projector does not actually “make” the color black. Since there is no such thing as black-colored light, projecting black is impossible.
Some projectors mix colors to produce a brown-like color used to represent black. Although not wholly black, our eyes perceive it as black nonetheless.
And now you know why a cinema turns the lights off – so the white screen is black in the absence of light. It makes the black items on film truly more black.
Three Frequently Asked Questions About The Projection Of Black
Should I choose a black or white screen?
For better contrast (to display better blacks), you should opt for a black screen. For a brighter image, you should opt for a white screen.
If you are watching in a dark environment, you should consider using a black screen since visibility and brightness are not an issue in light-restricted areas.
Are there HDR projectors?
Yes, there are HDR projectors. However, for an optimal experience, you should still curate your room to be built projector-first (in other words, consider the use of a projector when designing a room at all times).
What should I do to get a better quality image with my projector?
Ensuring that your projector is HDR, has the right amount of brightness, and has the right amount of resolution is critical.
Additionally, projectors are heavily affected by outside influence, so you should make your viewing room as dark as possible. Using black screens and having high-quality HDR video is also essential.
Sources
- https://wtamu.edu/~cbaird/sq/2015/06/16/how-do-projectors-project-the-color-black/
- https://www.amnh.org/ology/features/stufftodo_einstein/see_color.php
- https://www.pantone.com/articles/color-fundamentals/how-do-we-see-color
- https://wtamu.edu/~cbaird/sq/2015/06/16/how-do-projectors-project-the-color-black/
- https://pointerclicker.com/how-do-projectors-project-black/