reducing photosize without visible quality loss?

Discussion in 'Digital Photography' started by edk, Oct 24, 2013.

  1. edk macrumors regular

    Apr 12, 2006
    Hi, I have a batch of photos (each around 7MB) that I need to reduce to around 1MB in size each.

    Is there a way to do this, without much visible quality loss? Someone mentioned to me that you can reduce the color depth, and it has no visible effect.

    Any tips on how to best do this via photoshop/bridge/picassa, would be greatly appreciated!!
  2. rolsskk macrumors 6502

    Sep 1, 2008
    Why do you need to shrink the file size? Why not just resize the image if you need to shrink the file size. There's no way that you can magically drop 6mb off each image without impacting the quality of it.
  3. edk thread starter macrumors regular

    Apr 12, 2006
    I have to share a batch of photos to a parents group via the school. However, the school uses a very very old ISP account with very little space available.

    (And that's another topic for another day... I'd move them to Flickr if it had a built in download set option... unfortunately it doesn't :( )

    So, rather than uploading 500MB+ of photos, it needs to be more around 150MB.

    The guy who did this before mentioned the 'reducing colour depth' as a way of keeping the files large and usable, while keeping quality. 'it just removes the unused data' was his comments.... and the old photos on the server are all around 800KB and look not too bad.

    Problem is... i've not be able to work out how to do that yet :) (edit: and the guy isn't around to ask at the moment)
  4. NeGRit0 macrumors 6502a


    Apr 19, 2008
    Las Vegas, Nv
    Why not upload to dropbox, and share that way?

    Have you opened one of the old files to check the actual image size/resolution of them? He may have sized them down, especially if these are just for web viewing.
  5. Laird Knox macrumors 68000

    Jun 18, 2010
    What are the images going to be used for? Print, web, billboards?

    If Photoshop check Image > Mode and see if they are set above 8 Bits/Channel. 8-bit should be fine.

    How are you saving the files? If they are TIFFs then switch to JPEG. A reasonable setting on the JPEG quality (8 - high) should be good for most uses.

    If they are just web bound reduce the longest side to no more than 1000 pixels.

    Once you know what you want to do to the files record an action and batch process the files.
  6. compuwar macrumors 601


    Oct 5, 2006
    Northern/Central VA
    It depends on what format the images are in, what resolution they're shot at and what the output medium is. In general, the answer is yes, unless you're pixel peeping you can generally go to JPEG at a quality of 7-8 and re-size to fit your output just fine.

  7. ManhattanBeach macrumors member

    Oct 24, 2013
    As previously stated, use an online host like dropbox or! :cool:

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