The background is not white

Discussion in 'Photography Beginners' Forum' started by akazoly, Jan 13, 2008.

  1. akazoly

    akazoly TPF Noob!

    Joined:
    Jan 3, 2008
    Messages:
    236
    Likes Received:
    0
    This is my light tent (home made) using this tutorial http://digital-photography-school.com/blog/how-to-make-a-inexpensive-light-tent/ :

    [​IMG]

    I take the photo in manual mode, at F4. The background is not perfect white, I use a DAYLIGHT bulb (6400 K). The same problem happen with two bulb.

    This is the result:

    [​IMG]

    I try to shoot in RAW. But I don't know what I need to set to correct the gray background and this settings affect the image ? I think RAW is not the best solution for me. I want to keep the image quality.

    I use spot metering. Now I don't have more idea, anyone has a sugesstion ? How to correct this problem to achieve a white background ?

    Thanks!
    [​IMG]
     
  2. Mav

    Mav TPF Noob!

    Joined:
    Jan 1, 2008
    Messages:
    1,457
    Likes Received:
    2
    Can others edit my Photos:
    Photos OK to edit
    The white balance is correct. All I had to do to get it to pure white is push the exposure by about a half stop in DxO. You could do the same thing on the camera.
     
  3. Battou

    Battou No longer a newbie, moving up!

    Joined:
    May 10, 2007
    Messages:
    7,997
    Likes Received:
    26
    Location:
    Slapamonkey, New York
    Can others edit my Photos:
    Photos NOT OK to edit
    You could try putting up white walls on the sides as well, I have not yet used a setup like that but I am fairly sure a little more reflection from the sides would clear that up.
     
  4. akazoly

    akazoly TPF Noob!

    Joined:
    Jan 3, 2008
    Messages:
    236
    Likes Received:
    0
    Can you help me a bit and explain me in more details what is Dx0 ? I need + or - exposure ?
     
  5. Dominic

    Dominic TPF Noob!

    Joined:
    Dec 4, 2007
    Messages:
    77
    Likes Received:
    0
    Location:
    Maryland
    Can others edit my Photos:
    Photos OK to edit
    You can try using a gray card for your metering.

    Looking at your set-up, have you thought about using some tracing paper as a diffuser?
     
  6. Fate

    Fate TPF Noob!

    Joined:
    Jan 8, 2006
    Messages:
    1,685
    Likes Received:
    67
    Location:
    England - Worcestershire
    Can others edit my Photos:
    Photos NOT OK to edit
    I had silmilar issues with my studio shots at college... mainly cus the backdrop was dirty as lol, but it came out grey. I fixed it by shooting RAW and then making two convertions.. one fairly blown out one for the background and then one correctly exposed one for the subject.

    Worked for me
     
  7. akazoly

    akazoly TPF Noob!

    Joined:
    Jan 3, 2008
    Messages:
    236
    Likes Received:
    0
    I need aluminium foil under white paper?
     
  8. akazoly

    akazoly TPF Noob!

    Joined:
    Jan 3, 2008
    Messages:
    236
    Likes Received:
    0
    I wait more suggestions, please.. Thanks!
     
  9. Dominic

    Dominic TPF Noob!

    Joined:
    Dec 4, 2007
    Messages:
    77
    Likes Received:
    0
    Location:
    Maryland
    Can others edit my Photos:
    Photos OK to edit
    I use a gray card (Available at most any camera store and even in the back of some photography books. Actually, one of the British mags has a gray card included in this month's issue -- the one with the squirrel on the cover) for all of my home studio shots. I didn't want to buy a hand held meter and a gray card will help a great bit.

    As far as the tracing paper goes, if you'd like a cheap fix to harsh lighting, you can create a diffuser by using some tracing paper around the front of the light. I've built my home studio out of such ideas I've read about and numerous trips to the local fabric, hardware, and craft stores. Best of luck.
     
  10. jamesino

    jamesino TPF Noob!

    Joined:
    Dec 9, 2007
    Messages:
    115
    Likes Received:
    0
    Can others edit my Photos:
    Photos OK to edit
    Not sure if this has been mentioned already. The tutorial says to cover up the sides of the box with white paper too. In your picture, the sides were not covered, which would explain the grayish side-vignetting on your photo.
     
  11. akazoly

    akazoly TPF Noob!

    Joined:
    Jan 3, 2008
    Messages:
    236
    Likes Received:
    0
    Is a good idea to light the box from bottom ?
     
  12. Battou

    Battou No longer a newbie, moving up!

    Joined:
    May 10, 2007
    Messages:
    7,997
    Likes Received:
    26
    Location:
    Slapamonkey, New York
    Can others edit my Photos:
    Photos NOT OK to edit
    Yup it's been mentioned.
     

Share This Page