Teacher: Kenji Tachibana Digital Photography I Digital Photography I __________________________________. Photographic Gray – 18% Gray Light Meter Base

Teacher: Kenji TachibanaDigital Photography I Digital Photography I __________________________________

..

Photographic Gray – 18% GrayPhotographic Gray – 18% Gray

Light Meter Base - 7 slidesLight Meter Base - 7 slides

Copyright © 2003 - 2009 Kenji Tachibana


Photographic Gray / 18%: Light meter basePhotographic Gray / 18%: Light meter base

EExposure Meter: Standards and factsxposure Meter: Standards and facts

1.1. Image brightness is a relative thing in the real world, Image brightness is a relative thing in the real world, camera LCD, viewfinder, computer screen, and the camera LCD, viewfinder, computer screen, and the print. So, the idea of correct exposure is a print. So, the idea of correct exposure is a combination of science and art.combination of science and art.

2.2. Science – light meter has been based on the 18% Science – light meter has been based on the 18% gray for way over 50 years. And there are two kinds gray for way over 50 years. And there are two kinds of light meters. The reflected type (on your camera) of light meters. The reflected type (on your camera) and the more accurate incident type.and the more accurate incident type.

3.3. Classic Standard – Center Weighted metering was Classic Standard – Center Weighted metering was the culmination of the old metering technology the culmination of the old metering technology before computers. It performed with 80% or better before computers. It performed with 80% or better accuracy.accuracy.



EExposure Meter: Computerizedxposure Meter: Computerized

4.4. The center weighted reading measured only the The center weighted reading measured only the 12% circle area at the center of the frame. The new 12% circle area at the center of the frame. The new standard is based on taking readings from 3 to 9 standard is based on taking readings from 3 to 9 sections of the frame.sections of the frame.

5.5. That exposure meter information is processed by That exposure meter information is processed by the micro computer built into camera. The computer the micro computer built into camera. The computer runs a software referred to as ‘firmware’.runs a software referred to as ‘firmware’.

6.6. Although it’s still far from perfect. It still takes a lot Although it’s still far from perfect. It still takes a lot of skill and the ability to see to get closer to 100%.of skill and the ability to see to get closer to 100%.



MMonitor Calibration Reference:onitor Calibration Reference:

Grayscale : All the tones from 1 to 10 Grayscale : All the tones from 1 to 10 should separate. If 1 & 2 don’t should separate. If 1 & 2 don’t separate, your monitor is too dark. separate, your monitor is too dark. If 9 & 10 don’t separate, your If 9 & 10 don’t separate, your monitor is too light. monitor is too light. Not separating Not separating can also be an issue with Contrastcan also be an issue with Contrast..




Coin: It should look as though Coin: It should look as though it can be picked off the it can be picked off the screen. If it doesn’t, your screen. If it doesn’t, your Contrast may be set too low. Contrast may be set too low. If the highlight looks too If the highlight looks too chalky, the Contrast may be chalky, the Contrast may be set too high.set too high.




Hand/Grayscale: The handHand/Grayscale: The handcolor should look believable.color should look believable.If it looks too warm or cool,If it looks too warm or cool,you will probably have toyou will probably have toadjust your monitor RGBadjust your monitor RGBcolor settings if possible.color settings if possible.

Unfortunately, in most new flat panel LCD monitors, the Unfortunately, in most new flat panel LCD monitors, the color is no longer adjustable.color is no longer adjustable.



SSummary:ummary:

Oil painting technique has not change for a very long Oil painting technique has not change for a very long time. Most of the technical innovations and safe time. Most of the technical innovations and safe ingredients happened a long time ago.ingredients happened a long time ago.

For the digital photographer, it is all about continuously For the digital photographer, it is all about continuously changing technology. Too much emphasis has been changing technology. Too much emphasis has been placed in pixel count. Although a big break through in placed in pixel count. Although a big break through in sensor technology will come into being soon.sensor technology will come into being soon.

There has already been one quiet break through in There has already been one quiet break through in sensor chip technology. More and more CMOS chips sensor chip technology. More and more CMOS chips are replacing the much more expensive CCD’s are replacing the much more expensive CCD’s


EndEnd

Documents

Teacher: Kenji Tachibana Digital Photography I Digital Photography I __________________________________. Photographic Gray – 18% Gray Light Meter Base