Thought over LIGHT (and its visual effects)

You may feel strange though, there is no black and White

image in the Nature.  🙂

May be Monochrome image yes. = Pure B/W image is, in fact human

invention, in other words, it exists only in the brain, or a product of

the brain. = Simply because, there is no [no-colored light] exists =

all the light, even if it looks WHITE, it is just well balanced

mixture of the colors.

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So-called Color was created by the vibration of the Photon =

if you divide the distance of a Photon travels in a second in its

literally the speed of Light, by its number of frequency of the vibration = you get the wave-length.

The light-sensitive cells in our Retina called Corn cells (named from its shape) having the colored

pigment which selectively absorbe and stimulated by the particular wave-length, emits the nerve-

signal to the brain. = Hence the brain interpret those different signal created by each different light

as each different color. —– So that, when those Corn cells sending-out all the color signal evenly =

our brain think it is white and if they are less intensive than the white, the brain think it is gray.

But when the light level is very low = in the dark, the Corn cells couldn’t work well.  Instead, only

the Rod cells which doesn’t have color sensitivity, works. = hence, the visual image which lack the

color information were created in the brain = we feel (some what) B/W image. —– ghostly night

scene of grave-yard was conceived like a bluish B/W image = simply because, only the available

light source came from the stars (provided no Cine-light, or Torch-lamp there) = hence,

the Dracula film is the best in B/W = (it is closer to what actually we have seen) 😀

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As long as there is lots of light which is having all the spectrum of the light, we see

white as white and able to see a colored objects as its own color without color-shift.

Therefore, mirrors in the dressing room of a theater back-stage having many light valves fitted

around. = natural Ring light effect. = no shadow and no color-shift = it is essential for the make-up.

(still, even a white under tungsten-light is shifted to much warmer color of about 3000k)

—– yet still, it is often the case, the white is determined by its relative brightness.

Our eyes were adjusted to see the over all brightness or by the brightest object while varying the

size of the pupil.  And among the objects, see the brightest and relatively having all the spectrum

of the light as the white. = Hence, seemingly the yellow sun is so bright, we feel it is white in the sky.

In fact, all the photographers know, even a dark colored object will become

washed off white if it was over-exposed 5~7 stops more.

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In the natural environment, we are not necessary seeing the surroundings with ideal neutral light.

= not only the color-contribution of the light-source (such as Florescent light has Green cast due

to the Mercury atom) , but also the light was colored by the reflection of other object nearby.

—– May be it is the reason why we feel nicely lit image in a photo = too artificial.

While using color-corrected artificial light (Xenon discharge Solar-Light kind) or Studio-type flash

light, which is giving 5500K color temperature.   The more photographer worked to make every

corner in the scene within 2 stops of exposure difference, it become even more unnatural.

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=== So that, in this occasion, as I’m dealing with LED Ring Light, I’m experimenting

“How to design Non-ideal light source to create natural looking image”

= to make Colored Ring Light. 😀

(I’m going to show its result soon)

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PS :  If you’d like to experiment with LEDs, and try to connect different type of them parallel,

you need to connect a register to each types.   Such as; 

[3~4 Batteries (4.5V~6V) +] —> [100 ohm Register]—> [Blue or White LEDs]—>[Battery – ]

[ ———————– same  +] —> [100 ohm Register] —> [Red LEDs] —–> [same Battery – ]

[ ———————– same +] —> [100 ohm Register] —> [Green LEDs] —> [same Battery – ]

( Those Registers are to limit the current to the LEDs = may need change to such as 47 ohm =

If you connect 10 LEDs parallel, which needs 30mA, x10 of them mean, you need 300mA)

(Exact value is [Supply Voltage – Forward Voltage of LED / Resistance = Current  —– where,

Forward Voltage of Blue or White LED is 3.5V,  Red is 2V, Green or Amber are 2.5V ===

6 – 3.5 / 10o = 0.025 = 25mA  ——- As long as the Current is 50~20mA each, it would be OK)

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