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DPChallenge Forums >> Tips, Tricks, and Q&A >> Can you make a Gray Card
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Showing posts 26 - 30 of 30, (reverse)
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Canon EOS-7D
Canon EF-S 17-85mm f/4-5.6 IS USM
 02/23/2005 02:03:25 PM · #26
Ok, I just did an experiment with my Piece of gray printed paper. (Note I haven't called it a gray card).
Anyway I took 4 pictures where the gray card was a part of the picture each using a different white balance.
I loaded all the pictures into PS. There was a green one a yellow one a blue one and one almost correct.
Then I went into Curves on each picture, and selected the "Set Gray point" pipette, then clicked on the gray card that was showing in all 4 photos.
After this action, all 4 photos looked almost identical.
Canon EOS Rebel T6s
Canon EF 55-200mm f/4.5-5.6 II USM
 02/23/2005 02:06:44 PM · #27
For custom white ballance you shoot a white card and set your WB as per your cameras' instructions. For exposure you let your camera meter a 18% gray card under the lighting conditions you will be shooting under to determine correct exposure for a given scene. That's the way I understand it. Please correct me if I'm wrong.

There doesn't seem to be one "correct" RBG value for 18% gray. Different sources cite different amounts. Probably has to do with different colour spaces. Where an authority when you need one?
Fujifilm FinePix S3 Pro
 02/23/2005 02:12:42 PM · #28
Originally posted by orussell:
For custom white ballance you shoot a white card and set your WB as per your cameras' instructions. For exposure you let your camera meter a 18% gray card under the lighting conditions you will be shooting under to determine correct exposure for a given scene. That's the way I understand it. Please correct me if I'm wrong.

There doesn't seem to be one "correct" RBG value for 18% gray. Different sources cite different amounts. Probably has to do with different colour spaces. Where an authority when you need one?

Wow so did you take the same picture 3 times or pictures of didfferent things please excuse my ignorance in this matter everything we are talking about is completly new to me and i am a visual learner so you have to bare wtih me. Now does the gray card part of your picture or are you putting it in front the camera to help metering and then taking the picture only reason i ask is because shouldnt the camera be able to meter already?...
Thanks leon
Canon EOS Rebel T6s
Canon EF 55-200mm f/4.5-5.6 II USM
 02/23/2005 02:23:45 PM · #29
I often use bright white paper to set a custom white ballance but I've never metered off a gray card. Some people leave the gray card in the scene where it can be cloned or cropped out later. Others as I understand it set their exposure based on the gray card reading. Say in Av mode you choose an aperture, then if you depress the shutter release half way, the camera sets the shutter speed. Then you can use these values in manual mode to shoot your subject. That's how I understand it. I could be wrong. Please correct me if so.
Fujifilm FinePix S3 Pro
 02/23/2005 02:29:51 PM · #30
Originally posted by orussell:
I often use bright white paper to set a custom white ballance but I've never metered off a gray card. Some people leave the gray card in the scene where it can be cloned or cropped out later. Others as I understand it set their exposure based on the gray card reading. Say in Av mode you choose an aperture, then if you depress the shutter release half way, the camera sets the shutter speed. Then you can use these values in manual mode to shoot your subject. That's how I understand it. I could be wrong. Please correct me if so.

This is exactly my understand as well assuming we are correct i never tried setting a custom white balance although i do recall seeing it on the camera i gotta try that ..
Leon
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