Results 1 to 18 of 18

Thread: What happened ? Help !! :)

  1. #1

    Question What happened ? Help !! :)

    Look at these two photos shot on 10D
    Both using
    F 3.5
    1/250
    ISO 100
    Evaluative
    Auto WB
    No AE lock used

    How come the skin color so different ?

    Using Av mode
    Last edited by myloplex; 1st September 2003 at 04:23 PM.

  2. #2

    Default

    Using Auto mode



    I noticed when using Auto mode ...skin tones all seem better compared to Av,Tv,P mode....
    why ah ?
    Last edited by myloplex; 1st September 2003 at 04:23 PM.

  3. #3
    Member
    Join Date
    Jul 2003
    Location
    Singapore, North Area
    Posts
    507

    Default

    Where did you meter and what's your metering mode? If I'm not wrong, it's mainly cos of these 2 factors....

  4. #4

    Default

    Quote Originally Posted by Kira
    Where did you meter and what's your metering mode? If I'm not wrong, it's mainly cos of these 2 factors....
    Both use evaluative mode

    You mean where I AE lock at ?

    Auto --> automatic metering yah

    Av mode --> I just focus on her, when the red Af box flashes I just shoot.

    Should I have AE locked at her face ?

  5. #5
    Moderator
    Join Date
    May 2002
    Location
    Melbourne, Australia
    Posts
    4,026

    Default The border of the cardboard also different

    Hieee...

    Did you use Auto White Balance??......
    Looks like a change in white balance perhaps....

    regards,
    me

  6. #6

    Default

    Quote Originally Posted by sulhan
    Hieee...

    Did you use Auto White Balance??......
    Looks like a change in white balance perhaps....

    regards,
    me
    Yup AutoWB for both

  7. #7

    Default

    I am curious to know how the auto WB works as well. Seems like your 10D decided to give you a higher color temperature for your 2nd shot. Is this work of Artificial Intelligence here? (Doing my AI tutorial now.... )

  8. #8

    Default

    cannot see the pics...

    but are teh shutter speeds the same?

    if different,
    the one with longer shutter speed allows more of the ambient light to set into the pic... hence might have orangish tones (if in indoor warm light)

  9. #9

    Default

    Quote Originally Posted by sprockett
    longer shutter speed allows more of the ambient light to set into the pic... hence might have orangish tones (if in indoor warm light)
    care to elaborate ?

  10. #10

    Default

    First picture, the camera became a bit nervous because of the expression...

    Seriously, did you accidentally set exposure compensation to +ve for Av mode? That could account for the slight overexposure. Auto mode will presumably ignore exposure compensation settings, thus resulting in correct exposure.

  11. #11
    Senior Member
    Join Date
    Jun 2003
    Location
    Singapore, Bedok
    Posts
    1,785

    Default

    The diff i think is due to the parameters - the sharpening/contrast/tone/whatever setting.

    In Av, 10D uses the parameters you set. In Auto (the green box) the camera makes the decisions.

    The Auto one looks better because it is on 'point and shoot' setting. The Av one actually has the potential to look better because the full range of pixel values are within the dynamic range; however, you need to fiddle with the image to optimise it.

    The Auto looks good off the camera bcoz it uses a 'standard' optimizing algo, however, it may clip off some highlights or shadows, in an attempt to distribute the pixel values across the full working range

  12. #12

    Default

    Quote Originally Posted by sprockett
    cannot see the pics...

    but are teh shutter speeds the same?

    if different,
    the one with longer shutter speed allows more of the ambient light to set into the pic... hence might have orangish tones (if in indoor warm light)

    can see liao i hope : )

  13. #13

    Default

    Experts:

    Should I have used AE lock for this picture ? Aim at her face ?
    Or use partial metering can liao?

    I need some help at this post too:
    http://forums.clubsnap.org/showthread.php?t=43752

    Hope to know how to use AE lock properly

  14. #14
    Moderator
    Join Date
    May 2002
    Location
    Melbourne, Australia
    Posts
    4,026

    Default Looks like its the white balance....

    Hieee...Mylo.....

    I have taken your two originals and measure up its histogram for both faces and its profile is equal(use photoshop....do selection with the rectangle tool and with the selection active, look at the Image->Adjust->Levels....


    Both the photos selected face "levels" profile is identical. However, the only difference in this case, which may have introduced a slight difference in brightness of the photo is the "glare" area of the top photo which is more.(I have compared the differences in the framing and subjects in theframe and shade it - you see that the subjects in the "frame difference " area ,in this case your photo -are things which have significance influence on the overall photo.

    Looks like the color difference is solely due to the Auto White balance(if this was what you have selected). OR.....inconsistency in your IMAGER(sensor) in reproduction of colors(which is less likely).....

    1).......try taking some photos of a subject......repeatedly on a Tripod (same frame) and see if it is consistent......metering on same location.


    .2)......try taking some photos of a subject......repeatedly on a Tripod (slight shift frame left/right like your photos above) and see if it is consistent......metering on same location.


    3) ......Next try with different white balance with the same setup and see the results....

    THis will help you characterize your camera and you will learn to adapt to its behaviour and make your photographs more predictable...


    Hope these inputs did answer part of your question....

    regards,
    me

  15. #15

    Default

    This problem again. Different colors ..why ?!!

    Pardon the underexposure okay guys

    Same settings for ALL modes. Nothing else touched
    ISO100
    1/125
    f 8.0
    Auto WB
    Evaluative metering

    Using Auto Mode


    Progam, Av, Tv Manual all give the same color tone as this:


    How to correct this ? isit my camera problem ?

  16. #16

    Default

    problem solved

    can kick myself ... hahah

    Auto (green box) --> sRBG color space
    Program, AV, Tv was in adobe RBG color space

    Seems like is you use adobe RBG, colors seems to be not very rich.
    anyone know why ?

  17. #17
    Member
    Join Date
    May 2003
    Location
    Singapore
    Posts
    334

    Default

    Quote Originally Posted by myloplex
    Seems like is you use adobe RBG, colors seems to be not very rich.
    anyone know why ?
    That's because web browsers do not recognise the different colourspaces and treat all images as sRGB. If you open the both the sRGB and Adobe RGB images in Photoshop, they will look identical in colour.

    The digital photolabs also only recognise sRGB. If you send your photos for printing using Adobe RGB, they will look flatter as well.

  18. #18

    Default

    Quote Originally Posted by linse
    That's because web browsers do not recognise the different colourspaces and treat all images as sRGB. If you open the both the sRGB and Adobe RGB images in Photoshop, they will look identical in colour.

    The digital photolabs also only recognise sRGB. If you send your photos for printing using Adobe RGB, they will look flatter as well.
    okay thanxs
    funny thing I didn't touch my camera settings when I got it. Color was okay.... only after I send it to clean the CMOS at Canon .... then colors seem off....

    I found out the color temp was 7K (default 5.2K)
    Color space was Adobe RBG (default sRBG)

    maybe they did some testing and changed the settings.

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
  •