Page 1 of 2 12 LastLast
Results 1 to 20 of 28

Thread: White Balancing Question

  1. #1

    Default White Balancing Question

    Hi,

    I am using Nikon D70s. I took a picture of an object on a white paper. However, the photograph shows the paper as grey. Thus I did the following

    Press the WB button and turn the thumb dial until "Pre" is shown on the top panel. Release all buttons. Then, press and hold the WB button for a few seconds. "Pre" will flash. I took a photo of the paper to measure the white balance.
    However, the photograph still shows the paper as lighter grey. How do I solve this?

  2. #2

    Default Re: White Balancing Question

    after shooting at the paper, did you see "good" on the LCD? if not, then the camera has not captured the correct WB.

    Check your EV setting, making sure not EV compensation.

    use AWB to take a shot of the same paper using flash, if the paper turn out grey, something is wrong.

  3. #3

    Default Re: White Balancing Question

    Yes. it shows good. I am using preset white balance. But the image still turns out to be grey

  4. #4
    Moderator catchlights's Avatar
    Join Date
    Sep 2004
    Location
    Punggol, Singapore
    Posts
    21,902

    Default Re: White Balancing Question

    there is nothing wrong, the camera meter does not know this is a piece of white paper, so it produce it as gray paper.

    white paper is two stops lighter than mid tone grey, so you dial +2 when you use A or P mode, or open up two shops in M mode.

    to check whether you do the correct custom WB setting, shoot this white paper and load the image in photoshop, use the eye droplet to check are the RGB value show all same or very close.

    hope this help.
    Last edited by catchlights; 23rd February 2008 at 12:54 AM.
    Shoot to Live, Live to Shoot
    www.benjaminloo.com | iStock portfolio

  5. #5

    Default Re: White Balancing Question

    Can i email you the image i set using custom wb?

  6. #6

    Default Re: White Balancing Question

    as mentioned by catchlights this is not a WB prob but a wrong exposure prob

  7. #7

    Default Re: White Balancing Question

    Quote Originally Posted by Autumnite View Post
    as mentioned by catchlights this is not a WB prob but a wrong exposure prob
    Hmm. I am getting confused. So probably try +2 exposure compensate?

  8. #8
    Moderator catchlights's Avatar
    Join Date
    Sep 2004
    Location
    Punggol, Singapore
    Posts
    21,902

    Default Re: White Balancing Question

    camera meter reads all things in mid tone gray, if you shoot a piece of black paper with A, S or P mode, it will turn out grey also.

    don't bother to change to matrix, center weighted or spot metering mode, the result will be the same.

    you can find a piece of mid tone grey paper, take meter reading on this grey paper, than using the same reading to shoot a piece of white paper and a piece of black paper, both papers will turn out as it is.
    Shoot to Live, Live to Shoot
    www.benjaminloo.com | iStock portfolio

  9. #9
    Senior Member denniskee's Avatar
    Join Date
    Oct 2003
    Location
    bukit batok
    Posts
    5,468

    Default Re: White Balancing Question

    can refer to this thread for why white paper appears grey.

    http://www.clubsnap.com/forums/showthread.php?t=309544
    photography makes one sees things from all angles.

  10. #10

    Default Re: White Balancing Question

    Quote Originally Posted by denniskee View Post
    can refer to this thread for why white paper appears grey.

    http://www.clubsnap.com/forums/showthread.php?t=309544
    I followed the article to set the exposure compensation after I measured the white balance. If I do an exposure compensation of +1.3, it causes the paper to be white but the subject becomes over exposed.

    How can i ensure the paper to be white and the subject to be correctly exposed?

  11. #11
    Senior Member
    Join Date
    Mar 2004
    Location
    singapore
    Posts
    2,522

    Default Re: White Balancing Question

    Quote Originally Posted by qing02051981 View Post
    I followed the article to set the exposure compensation after I measured the white balance. If I do an exposure compensation of +1.3, it causes the paper to be white but the subject becomes over exposed.

    How can i ensure the paper to be white and the subject to be correctly exposed?
    Set up your lighting so that the paper is +1.3 while the subject is 0. Then shoot at 0.

  12. #12

    Default Re: White Balancing Question

    Quote Originally Posted by foxtwo View Post
    Set up your lighting so that the paper is +1.3 while the subject is 0. Then shoot at 0.
    Does that mean a desktop light is not enough to brighten the paper to +1.3?

  13. #13
    Member
    Join Date
    Jan 2008
    Location
    Serangoon, Singapore
    Posts
    855

    Default Re: White Balancing Question

    its not a problem of white balance.
    white balance isnt used to get white paper white and not grey.

    its abt the colour temperature (yellow/blue cast)


    ur problem is the way the camera meters, and u've gotta use exposure compensation to get it right like what others mentioned.

    in layman terms, if u shoot a piece of white paper coving the whole frame, the camera "sees" it as too bright, and thus, u'll get a lower exposure so that highlights isnt blown. similarly, if u do so with a piece of balck paper, the camera finds it too dark, and thus increased the exposure (eg: longer shutter speed, larger aperture, etc) to capture enought light.

    the camera's metering is fooled by the bright/dark paper. so u'll need to compensate the EV accordingly.
    EOS 6D | GH4 | LX100 | HERO4

  14. #14
    Senior Member
    Join Date
    Mar 2004
    Location
    singapore
    Posts
    2,522

    Default Re: White Balancing Question

    Quote Originally Posted by qing02051981 View Post
    Does that mean a desktop light is not enough to brighten the paper to +1.3?
    Open the shutter long enough sure can get to +1.3. So the light source is not so important, just have to ensure lighting ratio of 1.3:0.

    We can help you better if you explain what you want to do, what you shooting, what eqpt you have etc.

  15. #15

    Default Re: White Balancing Question

    Quote Originally Posted by foxtwo View Post
    Open the shutter long enough sure can get to +1.3. So the light source is not so important, just have to ensure lighting ratio of 1.3:0.

    We can help you better if you explain what you want to do, what you shooting, what eqpt you have etc.

    I want to learn product photography.
    I am trying to photograph an object (paper clip, pencil, anything) with a white background like those you see in stock photos.

    My Equipment
    - Nikon D70s
    - Kit lens (18-70mm)
    - Tripod
    - Self made light box
    - Desktop lamp

    Hope this helps! and many thanks for the patience with me

  16. #16
    Member
    Join Date
    Feb 2006
    Location
    Auckland, New Zealand
    Posts
    372

    Default Re: White Balancing Question

    if you want your subject to be properly exposed while the paper appears white in colour, you should dial in a +2 stop, meter the paper, lock the exposure and shoot the subject. you should play with the lighting so that the brightness difference between the subject and paper is within the acceptable range. you can do it by either bringing down the brightness on your subject, or increased the brightness of the paper/background.

  17. #17

    Default Re: White Balancing Question

    Let me try to explain that.

    WB and exposure are two different things. When you set Custom WB to your paper, what the camera do is ensure the paper will not cast any color. That mean the paper will not become yellow, or blue, or green but a certain color from pure black, dark grey, light grey to pure white. So, the term "white" in "white balance" just mean "colorless" and refer to the whole range from black to white, not only pure white.

    To get really white color on the paper, what you need more than WB is your material, lighting, exposure and PS. I suggest as following

    For material, choose a really white paper for your background, do not choose a grey one.

    For lighting, give proper lighting on your paper, not on your subject

    For exposure, use spot metering on your paper, and set exposure to 2+ stop. Ensure that the subject is not overexposed. If cannot get that, use PS.

    For PS, use color picker to measure the lightness of the paper and the subject. Normally, they are in two seperated region (that mean the paper is much brighter than the subject generally. So, use can choose the curve tool to boost lightness of the paper only while keep the lightness of the subject (almost) unchanged.

  18. #18
    Senior Member
    Join Date
    Mar 2004
    Location
    singapore
    Posts
    2,522

    Default Re: White Balancing Question

    Quote Originally Posted by qing02051981 View Post
    I want to learn product photography.
    I am trying to photograph an object (paper clip, pencil, anything) with a white background like those you see in stock photos.

    My Equipment
    - Nikon D70s
    - Kit lens (18-70mm)
    - Tripod
    - Self made light box
    - Desktop lamp

    Hope this helps! and many thanks for the patience with me
    Ok. Some items easily obtainable to help you. Pieces of white and black cards for bounce. You can use mirrors as well to get a more shiny reflection but white bounce cards work well in most situations.

    Depending on how reflective your subject is / how intense your light source is, have plenty of tracing paper or the thicker diamond paper (I got it at almost $1 per A1 from Art Friend) sheets on hand.

    Getting a cheap external flash would be useful, or go look for some bright desk lamps. Play with your lighting. Tip: Not all lights have to be pointed straight at the subject to make a photograph.

    It's going to be a bit hard for you to learn balancing lighting ratios shooting clips and pencils on a simple setup because there is no separation between subject and background. Try shooting something that can stand on it's own and is not too reflective like metal or glass. A block of wood if you must, just for experiment. Get 2 lights, one for subject and other for background. Place background paper beyond your shooting dof. It should not be in focus.

    Eh, it can only get more complicated in shooting product but just shoot within your ability and if it's acceptable to you then that's reasonable enough till you want to go further.
    Last edited by foxtwo; 23rd February 2008 at 01:42 PM.

  19. #19
    Moderator catchlights's Avatar
    Join Date
    Sep 2004
    Location
    Punggol, Singapore
    Posts
    21,902

    Default Re: White Balancing Question

    Quote Originally Posted by qing02051981 View Post
    I want to learn product photography.
    I am trying to photograph an object (paper clip, pencil, anything) with a white background like those you see in stock photos.

    My Equipment
    - Nikon D70s
    - Kit lens (18-70mm)
    - Tripod
    - Self made light box
    - Desktop lamp

    Hope this helps! and many thanks for the patience with me
    basically you place an object on a white paper b/g, you light the object and b/g as it is, you will never get pure white b/g. cos the white paper is only two stops brighter than mid tone, consider "important highlight with details", you want it to be in pure white, most of the time you will over exposed your subject too. so what most people do is either PS it or use a light table as b/g to get pure white b/g.
    Shoot to Live, Live to Shoot
    www.benjaminloo.com | iStock portfolio

  20. #20
    Senior Member denniskee's Avatar
    Join Date
    Oct 2003
    Location
    bukit batok
    Posts
    5,468

    Default Re: White Balancing Question

    the other way is u can expt using 2 flash, 1 behind the paper and the other on the camera. but the flash behind should not touching the paper though, adjust the distant such that it is enough to cover the paper.
    Last edited by denniskee; 24th February 2008 at 02:26 AM.
    photography makes one sees things from all angles.

Page 1 of 2 12 LastLast

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •