What's RAW IMAGE ?????????

Discussion in 'Digital Discussion & Q&A' started by elie1, Aug 30, 2010.

  1. elie1

    elie1 TPF Noob!

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    i never wrked on raw images, what are they for ? are they easier to manipulate on photoshop ?
    whats he diffrence between them and jpeg???
     
  2. ann

    ann No longer a newbie, moving up!

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    A RAW image is one that has NOT been processed by the camera and must be converted to another file type for use. It gives one a lot more options and personal style and taste .

    A JPEG file is processed incamera based on what the manufactor thinks we want an image to look like. This file is highly compressed

    If you have the proper software and want to control your image then shoot RAW, if your happy with what the images look like and don't want to spend the time working on the files then used jpeg's.

    there is a ton of infomration available, just use google and you will find more information that you probably want.
     
  3. KmH

    KmH Helping photographers learn to fish Supporting Member

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    Check out this web page:
    http://en.wikipedia.org/wiki/Raw_image_file

    To keep it basic and simple - A RAW data file requires post processing to be made ready for printing or display.

    Check out this web page for JPRG image file info:
    http://en.wikipedia.org/wiki/JPEG

    To keep it basic and simple - A JPEG image file is a ready to display or print file, that has been post processed to one degree or another with little or no input from the photographer.
    A JPEG image file is compressed to a much smaller than RAW file size using a lossy compression algorithm, meaning some of the original image data captured when the shutter was released has been discarded. Most of the discarded data is color data.

    The highest quality setting for a JPEG only retains about 25% of the original image data, a 1:4 compression ratio.

    Actually, what the image sensor records is processed fairly extensively processsed even when captured as a RAW data file (de-mosaicing, color intepolation, de-noise algorithms.)


    There are different types of RAW data files:
    • 12-bit color depth (4096 tonal gradations per color channel)
    • 14-bit color depth (16,384 tonal gradations per color channel)
    Some camers offer both, meaning processing by the camera.
    Some dSLR cameras only provide compressed 12-bit RAW data files. For some cameras the compressed RAW data file has also had image data discarded to make the file size smaller, a lossly compressed RAW data file.

    Self-help is a great way to discover things, you didn't know, you didn't know!
     
    Last edited: Aug 30, 2010

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