Jpg file size
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Thread: Jpg file size

  1. #1
    Join Date
    Mar 2001
    Location
    East Horsley, Surrey, UK
    Posts
    2,336

    Jpg file size

    What ho one and all,

    I normally shoot for stock and my MO is shoot RAW, open with ACR, fiddle around and save as the largest pixel offering in 16 bit tif. Then I have plenty of leeway for PS editing.

    However, I have been doing a bit of pro bono work for my local parish council; pretty much reportage of local events, so lots of images have been created. If I go my normal processing route, it will take forever and at the end of the day, they only want jpg, not tif files.

    In the past, I have found that using my normal MO, I can get an A4, 8 bit tif, save it as a jpg, and it is around (for example, 10mb.) Given that I know the pixel measurements, if I open the RAW reportage images in ACR, correct and set the defaults to the same pixel measurement, then hit the Save button, the saved file, although more or less A4 overall, is around half the mb size (or less) than a similar saved from an 8 bit tif.

    So my question is, what is the difference between converting from an A4 tif and saving as a jpg, or saving straight from ACR. Both files are overall, A4, but the mb count is significantly different. What data is being lost? What difference does that 'lost' data make to image quality?

    Toodle pip and thanks

    Rex
    What if the Hokey Cokey IS what it's all about?

  2. #2
    Join Date
    Feb 2000
    Location
    Idaho Falls, Idaho, USA
    Posts
    15,219
    TIFF files are much larger than RAW to start with, so a conversion from TIFF to JPG is likely to be larger than from RAW to JPG.

    Links:

    https://www.lifewire.com/differences...and-raw-493186

    https://www.nikonimgsupport.com/na/N...d=1&lang=en_SG

    http://www.betterphoto.com/article.asp?id=44

  3. #3
    Join Date
    Mar 2001
    Location
    East Horsley, Surrey, UK
    Posts
    2,336
    "TIFF files are much larger than RAW to start with, so a conversion from TIFF to JPG is likely to be larger than from RAW to JPG."

    I know and that is probably the reason. Good call!

    Thanks.
    What if the Hokey Cokey IS what it's all about?

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