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CVHManchester
Inspiring
November 3, 2016
Question

Rotate 48 bit TIFF files*

  • November 3, 2016
  • 1 reply
  • 4489 views

I am scanning a collection of ca 1500 prints using TIFF at 48 bit depth, each file being ca 819 MB. The scanner imports the the images as portrait, but most need to be rotated to landscape.

When trying to rotate these images using Organiser, this gives an error and says that the images will be reduced to 8 bit.

I am using Adobe Photoshop Elements Version: 14.1 (20151206.m.83730)  x64, Operating System: Windows 10 64-bit, 10 GB free memory.

Can I do a simple rotate in Photoshop without any modification of the internal content. just a transformation of the pixel coordinates?

Thank you

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    1 reply

    Jeff Arola
    Community Expert
    Jeff ArolaCommunity Expert
    Community Expert
    November 3, 2016

    It seems silly to me that the organizer insists on converting the perfectly good 16 bits/channel (48 bit) tifs to 8 bits/channel just to rotate an image 90 degrees left or right, but unfortunately that's the way it is.

    Anyway, you can open the tifs in the pse 14 editor and rotate them by going to Image>Rotate>90° right or 90° left, then File>Save and overwright the existing tiff file.

    C
    CVHManchesterAuthor
    Inspiring
    November 3, 2016

    Thank you for the prompt confirmation of what I did not want to hear.

    When I tried your method using process multiple files, it opens each file taking about 90 seconds each.  I started with a sample directory of 20 of my files and gave up waiting.  I did not get as far as rotating, then saving them.

    Do you know of any image manipulation software that can do what I need in an economical manner?

    Jeff Arola
    Community Expert
    Jeff ArolaCommunity Expert
    Community Expert
    November 4, 2016

    Thank you. I was looking for a complex solution and ignored the simple one.

    The bulk rotation worked fine. However, File Explorer rotate also applied LZW compression, which increased the file size from 839 to 1100 MB.  I cannot find a solution in Microsoft communities either.

    So not quite there yet.


    You can try using Irfanview to resave the tif files without any compression or try Zip compression which should provide smaller file sizes than the original.

    You could experiment with one file in the pse 14 editor and resave the tif with zip compression to see.

    File>Save As>TIFF

    The problem with photoshop elements is while one can batch process the resaving of the scans (tifs), one can't specify any options like compression, so that's why Irfanview would be the one to try and besides it would take a very long time with such large file sizes for photoshop elements to complete the process.

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