48mb JPG from a 7mb RAW file?

Discussion in 'Digital Discussion & Q&A' started by Fingers, Oct 31, 2007.

  1. Fingers

    Fingers TPF Noob!

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    Thought I might give this a try www.alamy.com to sell some pics.

    They only want however 48mb jpg's !!

    So how does one do this from a RAW file from a EOS 20D or is this not poss with my kit?
     
  2. gryphonslair99

    gryphonslair99 Been spending a lot of time on here!

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    Follow the guidlines they posted at the site:

    </H2>
     
  3. DHammer

    DHammer TPF Noob!

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    If you really search their requirements, its 48 to 200 megs uncompressed in 8 bit tiff form. So the jpeg will be much smaller.
     
  4. Fingers

    Fingers TPF Noob!

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    Like I say, how can you create a 48mb file JPG from a RAW file?

    Following the instructions does not get me anywhere near 48mb.

    When you try and upload a JPG file it actualy says its under the 48mb so they are indeed after JPGs of this size?!!!!!

    Even saving the RAW file as a TIFF only produces around 40mb.

    Can anyone make any sence of this at all, why are there wanting to bloat the size of a file?

    What sort of size file comes off an EOS D1 ?
     
  5. Jestev

    Jestev TPF Noob!

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    The JPEG that you make to upload onto their site will not be 48mb. The uncompressed file that you create the uploadable JPEG from should be 48-200mb in size.
     
  6. Fingers

    Fingers TPF Noob!

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    Two things

    "The uncompressed file that you create the uploadable JPEG from should be 48-200mb in size."

    How do you do this from an 8mb RAW file.

    "The JPEG that you make to upload onto their site will not be 48mb."

    I tried to upload an 8mb JPG to the site and it said it was too small!

    Forgive my greeness here, but I am new to RAW format and am still no further forward here.
     
  7. Helen B

    Helen B TPF Noob!

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    The 20D is an 8.2 megapixel camera. An uncompressed 8-bit-per-channel RGB file will be about 8.2 x 3 = 24 MB file, give or take a millibit or two.

    Here is what Alamy suggest:

    "Interpolate (upsize) the file to at least 48MB using a specialist, professional software package. We recommend Genuine Fractals&#8482; although other software is equally acceptable, including Abobe Photoshop versions 7 or higher (if the bicubic option is used). Do not use &#8220;step&#8221; or incremental interpolation. Check your software&#8217;s default settings to ensure that sharpening is turned off. All results are assessed on their merits, regardless of the method used."

    A 48 MB uncompressed 8-bit file is the equivalent of about 16 megapixels.

    Best,
    Helen
     
  8. Fingers

    Fingers TPF Noob!

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    Ah OK thanks Helen.....
     
  9. Fingers

    Fingers TPF Noob!

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    Ok So here I am at 3000 dpi !! 139mb

    Can anyone tell me if there is any advantage to this? Does it meen it can be printed off the size of a house?

    I am flumuxed with these massive sizes.
     

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