using grey card

Discussion in 'Photography Beginners' Forum' started by mathews, Jul 15, 2010.

  1. mathews

    mathews TPF Noob!

    Joined:
    Jul 6, 2010
    Messages:
    15
    Likes Received:
    0
    Location:
    india
    Can others edit my Photos:
    Photos OK to edit
    what is the lighting conditions most suitable for using the grey card. can i use it in bright sunlight to get a meter reading or in shadows. is an overcast day all right for using a grey card. please help.
     
  2. Alpha

    Alpha Troll Extraordinaire

    Joined:
    Mar 15, 2005
    Messages:
    5,454
    Likes Received:
    41
    Location:
    San Francisco
    Can others edit my Photos:
    Photos NOT OK to edit
    Any lighting condition is suitable for using a gray card. That's the point of the gray card.
     
  3. shmne

    shmne No longer a newbie, moving up!

    Joined:
    Jun 3, 2009
    Messages:
    641
    Likes Received:
    83
    Location:
    Florida
    Can others edit my Photos:
    Photos OK to edit
    The beauty of the gray card is that regardless of what colors are lurking around the world, you can trust that your card will stay the same color within its life span.

    This lets you say, regardless of light, that that card is gray. When you are in photoshop this means that you can use the curves adjustment to color correct your scene by using that card (as well as a source of white and black in the scene)
     
  4. Boomn4x4

    Boomn4x4 TPF Noob!

    Joined:
    Mar 15, 2010
    Messages:
    766
    Likes Received:
    4
    Location:
    Ohio
    Can others edit my Photos:
    Photos OK to edit
    ^ +1

    What you are asking is the same thing as, "what temperture is ideal to use a thermometer?"
     
  5. Flash Harry

    Flash Harry TPF Noob!

    Joined:
    Jun 26, 2006
    Messages:
    1,918
    Likes Received:
    1
    Location:
    Durham, UK
    Can others edit my Photos:
    Photos NOT OK to edit
    basically your cameras meter renders everything 18% grey, (not 12%), green as in grass, is also mid range in colour, hence why a reading from grass or a grey card will give correct exposure for the lighting in the scene you shoot, as long as the reading was in the same light and as long as you lock exposure on the card or grass before firing at the subject. Once you grasp the basics of the meter, (being a liar basically) then you know to overexpose for whites, dependent on how bright the scene is, 1, 2 ,3, stops etc or underexpose by similar for darker colours and shadows. H
     
  6. mathews

    mathews TPF Noob!

    Joined:
    Jul 6, 2010
    Messages:
    15
    Likes Received:
    0
    Location:
    india
    Can others edit my Photos:
    Photos OK to edit
    but doesn't colour change under different lighting conditions.
     
  7. Boomn4x4

    Boomn4x4 TPF Noob!

    Joined:
    Mar 15, 2010
    Messages:
    766
    Likes Received:
    4
    Location:
    Ohio
    Can others edit my Photos:
    Photos OK to edit
    You aren't metering "color"... you are metering available light. The color is irrelevant. Blue can reflect 18%, red can reflect 18%, yellow can reflect 18%... you could just as well use an 18% red card, and 18% blue card, or an 18% yellow card... people just use gray because its a simple color to make.

    Your exposure dosen't have ANYTHING to do with the colors, it has to do with how much light is available.
     
  8. mathews

    mathews TPF Noob!

    Joined:
    Jul 6, 2010
    Messages:
    15
    Likes Received:
    0
    Location:
    india
    Can others edit my Photos:
    Photos OK to edit
    red is 18%. yellow is one stop lighter than red so it cannot be used as a grey card.
     
  9. Bitter Jeweler

    Bitter Jeweler Been spending a lot of time on here!

    Joined:
    Apr 27, 2009
    Messages:
    12,984
    Likes Received:
    4,971
    Location:
    Cleveland, Ohio
    Can others edit my Photos:
    Photos OK to edit
    the internets is full of experts
     
  10. Willl

    Willl TPF Noob!

    Joined:
    Dec 26, 2009
    Messages:
    49
    Likes Received:
    0
    Location:
    CT
    Can others edit my Photos:
    Photos OK to edit
    Yeah that's why everything on the internet has to be true.
     
  11. mathews

    mathews TPF Noob!

    Joined:
    Jul 6, 2010
    Messages:
    15
    Likes Received:
    0
    Location:
    india
    Can others edit my Photos:
    Photos OK to edit
    to be frank, i am totally confused myself.
     
  12. Boomn4x4

    Boomn4x4 TPF Noob!

    Joined:
    Mar 15, 2010
    Messages:
    766
    Likes Received:
    4
    Location:
    Ohio
    Can others edit my Photos:
    Photos OK to edit
    There is no reason you cannot have a shade of yellow that reflects 18% of light.
     

Share This Page

Search tags for this page

15% grey card

,
15 grey card
,
15% grey cards photo
,
15 grey card photography
,
advantages of using 18% grey card for video
,
grey card t2i
,

how to use a grey card canon

,
how to use grey card in eos canon
,
how to use grey card t2i
,

using a grey card with canon