Contrast-Calculation between two planes

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SUMMARY

The discussion focuses on calculating the contrast between two planes, specifically a semi-transparent plane and a wall, in relation to a monitor's luminance. The user has identified the luminance of the monitor and the reflectivity of the semi-transparent plane at 20%. They seek assistance in factoring the distance from the plane to the eye and converting luminous flux from the wall into a comparable unit for luminance. The user also references the "Pepper's Ghost" setup and aims to determine the necessary brightness of their display in a room illuminated at 1200 lux.

PREREQUISITES
  • Understanding of luminance and luminous flux concepts
  • Knowledge of semi-transparent materials and their reflectivity
  • Familiarity with the "Pepper's Ghost" optical illusion technique
  • Basic principles of light transmission and measurement in lux
NEXT STEPS
  • Research how to calculate luminance from luminous flux
  • Learn about the effects of distance on perceived brightness
  • Explore the principles of light transmission through semi-transparent materials
  • Investigate methods for measuring and adjusting display brightness in varying lighting conditions
USEFUL FOR

This discussion is beneficial for optical engineers, lighting designers, and anyone involved in visual display technology, particularly those working with semi-transparent materials and contrast calculations in illuminated environments.

QuestionsAsker101
Hi there, I am new to the Forum!

I have a little bit of a tricky Problem. I am trying to calculate the Contrast between two planes as seen here:

Pic1.png

So I started by cutting the Problem in two Parts.
Part 1, The Monitor:
Pic3.png

I know the Luminance of the Monitor X, and the reflectivity of the semi-transparent Plane A2 20%.
Therefor I know that I can now get the Luminance of the semi-transparent Plane by Assuming it as a plane with a smaller Surface A2* with the Luminance of 20% of the Monitor, because the distance of the monitor and the plane is very Small.
Pic4.png

So this is where the Problems beginn: I don't know how to factor in the distance of the plane to the Eye, so that i can later compare it to the Plane A1.

The second Part of the Problem is the Wall:
Pic2.png

The wall is seen from the same angle omega as the semi-transparent plane. The light that passes through the semi-transparent plane gets a factor of 0.34 from the degree of transmission.
I know how to calculate the luminous flux of the Wall, but can't quite get how to transfer the luminous Flux to a unit, that i can compare to the Luminance of the Monitor.

Can anyone here help me?
 
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QuestionsAsker101 said:
Hi there, I am new to the Forum!

I have a little bit of a tricky Problem. I am trying to calculate the Contrast between two planes as seen here:

Is your setup like "Pepper's Ghost"?

https://en.wikipedia.org/wiki/Pepper's_ghost
 

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