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Author Topic: Histograms  (Read 600 times)

rabanito

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Histograms
« on: May 08, 2019, 02:25:22 pm »

I gather that the histograms in my camera are "valid" for the .jpg format,
1. My camera permits to adjust among other parameters, contrast. Then the histograms change for the same image.
I assume that this adjustment is only valid for the .jpg format and since I take pictures in RAW, there should be no real change.
Am I right?
2.Now when the RAW file is imported in LR, I have a similar histogram.
I assume that this histogram is the product of the interpretation of the raw data by LR
If I export from LR to PS the histogram in PS is similar but not quite the same.

This is a little confusing to me.
I can live with that but I wonder if I'm missing some tool or "weapon" that could make my life still easier.
Should I ignore this data or take it with a grain of salt? Or is it VERY important?

Thanks for any hints  :)
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digitaldog

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Re: Histograms
« Reply #1 on: May 08, 2019, 04:11:48 pm »

Everything you thought you wanted to know about Histograms

Another exhaustive 40 minute video examining:
What are histograms. In Photoshop, ACR, Lightroom.
Histograms: clipping color and tones, color spaces and color gamut.
Histogram and Photoshop’s Level’s command.
Histograms don’t tell us our images are good (examples).
Misconceptions about histograms. How they lie.
Histograms and Expose To The Right (ETTR).
Are histograms useful and if so, how?

Low rez (YouTube): http://www.youtube.com/watch?v=EjPsP4HhHhE
High rez: http://digitaldog.net/files/Histogram_Video.mov
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Andrew Rodney
Author “Color Management for Photographers"

Guillermo Luijk

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Re: Histograms
« Reply #2 on: May 08, 2019, 04:27:29 pm »

To add some confusion :D I'll show you a genuine RAW histogram (yes, they exist, anything that is represented by a series of numbers has a histogram. Simply your camera and RAW developer makers refuse to provide it):



Such a histogram would be very useful to have in our cameras since it provides accurate exposure information in a very intuitive way (each column in this case represents a stop).

https://www.change.org/p/camera-manufacturers-include-raw-histograms-on-digital-cameras-8ad3dda3-5b22-4438-83e2-0e18689db4ab?use_react=false

Regards

rabanito

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Re: Histograms
« Reply #3 on: May 08, 2019, 05:24:22 pm »

Everything you thought you wanted to know about Histograms



Thank you Andrew. I expect another interesting tutorial  :)
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rabanito

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Re: Histograms
« Reply #4 on: May 08, 2019, 05:26:52 pm »


Such a histogram would be very useful to have in our cameras since it provides accurate exposure information in a very intuitive way (each column in this case represents a stop).


Good idea, Guillermo
Yo tambien firmé
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rabanito

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Re: Histograms
« Reply #5 on: May 09, 2019, 11:08:36 am »

Thank you Andrew. I expect another interesting tutorial  :)
Yes it is
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rabanito

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Re: Histograms
« Reply #7 on: May 10, 2019, 12:52:56 pm »

Some articles to consider.



Thanks Kirk.
I started to read  :)
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