Why are my TIF files three times the size of RAW?

Discussion in 'Beyond the Basics' started by dEARlEADER, May 11, 2008.

  1. dEARlEADER

    dEARlEADER TPF Noob!

    Joined:
    Apr 9, 2008
    Messages:
    1,312
    Likes Received:
    1
    Location:
    Canada
    Can others edit my Photos:
    Photos OK to edit
    I'm loading RAW files from my D60 on ViewNX and converting them to TIF without any editing...

    My average RAW are 6 - 9meg.... most all of the TIF's are 28.8meg after conversion..

    I thought these were both lossless format's... why are my TIF's so fat?
     
  2. MACollum

    MACollum TPF Noob!

    Joined:
    Dec 13, 2006
    Messages:
    404
    Likes Received:
    1
    Location:
    Oklahoma
    Can others edit my Photos:
    Photos OK to edit
    PP adds lots of information to a file that wasn't already there (how to display the colors differently, for example). If it were already there, you wouldn't be doing PP in the first place. ;)
     
  3. dEARlEADER

    dEARlEADER TPF Noob!

    Joined:
    Apr 9, 2008
    Messages:
    1,312
    Likes Received:
    1
    Location:
    Canada
    Can others edit my Photos:
    Photos OK to edit

    This conversion is PRIOR to any PP...

    -Load RAW files onto drive using capture NX

    -Select the RAW and immediately convert to TIF
     
  4. usayit

    usayit No longer a newbie, moving up!

    Joined:
    Nov 15, 2003
    Messages:
    9,523
    Likes Received:
    344
    Location:
    North New Jersey, United States of America
    Can others edit my Photos:
    Photos OK to edit
    Tiffs do have compression (lossless) as well.... it can be turned off. I do believe some RAW formats also implement some sort of compression (lossless). not to be confused with lossy compression of JPEG.

    Perhaps you are going from a compressed RAW file to an uncompressed TIFF?
     
  5. Helen B

    Helen B TPF Noob!

    Joined:
    Sep 16, 2007
    Messages:
    3,296
    Likes Received:
    465
    Location:
    Hell's Kitchen, New York
    Can others edit my Photos:
    Photos NOT OK to edit
    A TIFF file has three channels of information per pixel; red, green and blue. A Raw file only needs one channel per pixel because the colours are calculated during processing. In addition, Raw files may be compressed losslessly as well as slightly lossily.

    Best,
    Helen
     
  6. astrostu

    astrostu Guest

    What Helen said. Also, usually RAW is less than 16-bit (I think the best on-camera A/D converter is 14-bit these days). So 16-bits for 3 channels (R, G, B) takes up much more space.
     

Share This Page

Search tags for this page

myxxxtif