User Tag List

Thanks useful information Thanks useful information:  0
Results 1 to 4 of 4

Thread: Highlight/Shadow blowout

  1. #1
    Ausphotography Regular wideangle's Avatar
    Join Date
    28 Sep 2007
    Location
    Hobart
    Posts
    1,460
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Highlight/Shadow blowout

    Why is it that when you have an original full size image up on screen and check levels for highlights/shadows they are fine, but then when you say shrink for web and check there are blown highlights and shadow areas? In saying that they are blown, its not massive, but it is more there.

    I take it that the historgram is just representing pixels that are bunched closer toghther so the 'looser' pixel information is lost?
    please ask before PP my images

    "Life is what happens to you while your busy making other plans"

  2. #2
    Member
    Join Date
    01 Apr 2008
    Location
    Launceston Tasmania
    Posts
    1,172
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I can't say I have ever noticed this myself but what your saying does sort of make sense to me.

    Paul

  3. #3
    Administrator ricktas's Avatar
    Join Date
    24 Jun 2007
    Location
    Hobart
    Posts
    15,640
    Mentioned
    10 Post(s)
    Tagged
    1 Thread(s)
    JPG compresses the range of colours.shades etc in photos, so it could make sense that if you are very close to ultimate black or white, that the JPG compression algorithm moves those slightly and you end up seeing the results you have.

    Good information on how JPG compression works is here
    "It is one thing to make a picture of what a person looks like, it is another thing to make a portrait of who they are" - Paul Caponigro

    Constructive Critique of my photographs is always appreciated
    Nikon, etc!

    RICK
    My Photography

  4. #4
    Member
    Join Date
    08 May 2008
    Location
    **Suburb/Town Required**
    Posts
    36
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Never experienced this issue myself after loads of resizing and conversions.

    All I can assume is that your shooting in Adobe and then converting to sRGB.
    See my website @ http://www.aroundsydneyphotography.com

    Pentax K20D
    D-BG2 Battery Grip
    Sigma 24-70mm f/2.8 EX DG Macro
    Sigma 70-200mm f/2.8 EX DG HSM II
    Slik 300DX Tripod
    Sigma 530 DG Super Flash
    SanDisk 200X 8GB SDHC Cards

Posting Permissions

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