1. Windows Central Question's Avatar
    I save all my scanned photos as TIFF files uncompressed but when I edit properties and ex add a Titel and save - Explorer automatically compress the file with LZW TIFF! How do prevent it to do that!?!?
    09-06-2016 01:51 PM
  2. TechFreak1's Avatar
    It is indeed as you say "lossless" but to future proof my pictures, I would not have these compressed in any way. The next question is why does Windows do this without even asking if I want to do this !! ---- and how do I turn it OFF :-(
    Try this
    -> CTRL + X
    -> System
    -> Advanced system settings
    -> Environment Variable
    -> {The top box is for current users / bottom box is for system wide - affecting all users} Click New in either box (depending on where you want the change to impact
    ->Variable Name: NO_COMPRESS_TIFF_LZW & Variable Value: 1.
    ->Click OK, you may need to log off / restart to apply changes.

    And as andycalling mentioned it's primarily to save disk space. I initially thought it was compressing twice a)saving it in LZW and compressing the file (in windows 7 compressed files would appear as blue text, in windows 10 with two arrows). My apologies I misunderstood .
  3. TechFreak1's Avatar
    Please join the site so you can reply in this thread and attach a screenshot (it will show up as an attachment).

    I'm curious as to why this would happen.

    See this link for instructions on how to join Windows Central.
    09-06-2016 05:59 PM
  4. Randih's Avatar
    Hi - I was the one who wrote this question

    After I scanned a photo as a TIFF file - without compression - I go into Windows Explorer and adds properties for the photo such as Title, Author, etc.. That's when I save it I can see that the size of the file is changed. If I access the properties of the picture, I see that it has been compressed with LZW!
    I want to turn off this feature in Windows as I do not want my pictures compressed. I have Windows 10, but have read that this feature was already in Win7 but have not found any solution to the problem
    TechFreak1 and Chintan Gohel like this.
    09-07-2016 05:57 AM
  5. Randih's Avatar
    Screenshots
    save-4.jpg
    save-5.jpg
    09-07-2016 06:12 AM
  6. AndyCalling's Avatar
    Note that LZW compression of TIFFs is lossless, a bit like zip compression for files. It is not like jpeg lossy compression. Unless you have a very specialised reason to avoid it, I would just use LZW compression. Do you have a specific purpose in mind that needs an uncompressed TIFF?
    Chintan Gohel likes this.
    09-07-2016 07:06 AM
  7. Randih's Avatar
    It is indeed as you say "lossless" but to future proof my pictures, I would not have these compressed in any way. The next question is why does Windows do this without even asking if I want to do this !! ---- and how do I turn it OFF :-(
    09-07-2016 07:19 AM
  8. AndyCalling's Avatar
    Firstly, LZW is a very widely used compression method which has been in use for a long time and the chances of future issues due to that are slim to nonexistent. Secondly, the TIFF format is not referred to as 'Thousands of Incompatible File Formats' due to its portability. Seriously, if you are archiving stuff run far away from TIFF. There is no guarantee that a TIFF saved from one package will open in another today, let alone in 50 years time. Personally I would use PNG but if you want simple, a BMP file is probably your best bet.
    Chintan Gohel likes this.
    09-07-2016 01:33 PM
  9. AndyCalling's Avatar
    Oh, just to add, Windows probably does this because there is no reason not to. Everyone saves TIFFs with LZW in the real world. If someone needs uncompressed for a very unusual reason, they can always uncompress the TIFF with whatever graphics software they use (I use Irfan View for such things, but anyone with such exotic image requirements will certainly have their own favourite they always reach for). Problem solved. The real question here is why on earth MS might allow Windows to start generating massive uncompressed TIFFs for no identifiable reason other than to make HDD manufactures happy?
    Chintan Gohel likes this.
    09-07-2016 01:39 PM
  10. TechFreak1's Avatar
    It is indeed as you say "lossless" but to future proof my pictures, I would not have these compressed in any way. The next question is why does Windows do this without even asking if I want to do this !! ---- and how do I turn it OFF :-(
    Try this
    -> CTRL + X
    -> System
    -> Advanced system settings
    -> Environment Variable
    -> {The top box is for current users / bottom box is for system wide - affecting all users} Click New in either box (depending on where you want the change to impact
    ->Variable Name: NO_COMPRESS_TIFF_LZW & Variable Value: 1.
    ->Click OK, you may need to log off / restart to apply changes.

    And as andycalling mentioned it's primarily to save disk space. I initially thought it was compressing twice a)saving it in LZW and compressing the file (in windows 7 compressed files would appear as blue text, in windows 10 with two arrows). My apologies I misunderstood .
    Randih and Chintan Gohel like this.
    09-07-2016 02:30 PM

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