Light Meter In The Software
Dear Sir,
I'm a PhaseOne user. I use H10 and C1 DB ver 3.6 for Mac. I want to know how I can get the information (in the software) about an exposure in the specific area of the image has been taken ?For example : I've shot a landscape (the image consists of sky, land and tree). How can I determine what the exposure in the sky ? in the land ? under the tree ? between leaves ?. I mean : is it over / under ? If over / under, what is the under / over value (for example : under 1.5, over 0.3, under 1.7, over 0.6, etc). I've found a kind of spot meter in the software, but the value is not the exposure value. The value is for color (R,G,B). I'm as a photographer doesn't know what the information for ? Does it contain specific meaning ? For example : if R:23, G:250, B:123. What does the exposure mean ? Is it over 1.2, or under 2.1 or over 0.4, or under 0.1 ? I don't know. May be you can explain me what the relationship is between R,G,B values and exposure values. I see that Sinar and Leaf software has that feature (spot meter).
Thank You
I'm a PhaseOne user. I use H10 and C1 DB ver 3.6 for Mac. I want to know how I can get the information (in the software) about an exposure in the specific area of the image has been taken ?For example : I've shot a landscape (the image consists of sky, land and tree). How can I determine what the exposure in the sky ? in the land ? under the tree ? between leaves ?. I mean : is it over / under ? If over / under, what is the under / over value (for example : under 1.5, over 0.3, under 1.7, over 0.6, etc). I've found a kind of spot meter in the software, but the value is not the exposure value. The value is for color (R,G,B). I'm as a photographer doesn't know what the information for ? Does it contain specific meaning ? For example : if R:23, G:250, B:123. What does the exposure mean ? Is it over 1.2, or under 2.1 or over 0.4, or under 0.1 ? I don't know. May be you can explain me what the relationship is between R,G,B values and exposure values. I see that Sinar and Leaf software has that feature (spot meter).
Thank You
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A lightmeter as you described is far from a acurate tool to use, we used it in older software but it does not give a true picture.
RGB stands for Red, Green and Blue which are the three channels a digital sensor records.
the values goes from 0 to 255 which is a 8-bit repesentation of a induvidual image pixels value.
0 is complete black and 255 is complete white.
It can be for example that one channel has been bruned out and a light meter would not tell you that while a RGB value will.
If you a located in Indonesia I am sure that Primacolor has courses to help you figure this out.0 -
Thank You for your reply.
So, what is your suggestion ? Am I still have to use external spot meter to measure specific area (for accurate result) or is there any way to do measuring ?
Second question :
In tool setting (warning color) for highlight and shadow, there is two parameter number, for shadow and for highlight. Is the number indicate a special exposure parameter ? For example : I set parameter for highlight to 200. When I click exposure warning button, there is a special color blocks some areas in the picture to indicate that area is highlight area (no detail). As a photographer I don't know what the exposure is in that area. When I suppose that area is out of detail, I don't think so, because when I change the number parameter in the tool setting (warning color) for highlight and shadow to 215, the color block doesn't appear. May be I need some explanation for that question.
Thank you0 -
The range of digitized images is from black (no information) to white (max information) 0~255. Unfourtunately, I have seen no correlation to f-stops, color filter CC numbers, or other common photo numbers.
It all depends on how you are outputting your image. The ConeTech Piezography system can print detail in shadows as low as 1. A CMYK offset press may loose it at 25. Same with highlights. A CMYK offset press can loose it at 240, but an inkjet output can print detail up into the 250's.
Add to that the colorspace you are in. A black of 25/25/25 in AdobeRGB will give you different numbers in sRGB, and different numbers in ColorMatchRGB, etc.
The following are \"must reads\"
Real World Colormanagement by Bruce Fraser.
Real World Digital Photography by Katrin Eismann
Real World Photoshop by David Blatner
Mastering Digital Printing by Harald Johnson
Professional Photoshop by Dan Margulis0 -
Ok..Thanks for your information 0
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