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I can import 70000 x 2MB TIFF images (~140GB) using

Image`ImportExportDump`ImageReadTIFF

in about 3 minutes based on @Szabolcs solution to this question by @Kagaratsch which is fantastic.

However, the image data is converted to floating point numbers <1.

Is there an option for Image`ImportExportDump`ImageReadTIFF which will preserve the original integer image data?

I tried using the options "Data", "Bit16", "Automatic" which returned $Failed.

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  • $\begingroup$ Hard to help without the actual file. Can you upload your image somewhere and post a link? $\endgroup$
    – M.R.
    Oct 30, 2018 at 17:15
  • $\begingroup$ Please try to put a TIFF file somewhere we can access it, then include code that shows what you expect to get back and what you actually get back. $\endgroup$
    – Jason B.
    Oct 30, 2018 at 18:26
  • $\begingroup$ @DrBubbles you posted a PNG not a TIFF $\endgroup$
    – M.R.
    Oct 30, 2018 at 18:34
  • $\begingroup$ Sorry, I will generate one inline when I get back to my desk $\endgroup$
    – DrBubbles
    Oct 30, 2018 at 18:37
  • 1
    $\begingroup$ @DrBubbles - if you solved your problem, consider moving the Update section to a self-answer if you think this will help someone in the future. $\endgroup$
    – Jason B.
    Oct 30, 2018 at 19:18

1 Answer 1

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Update: Just found the problem was my use of ImageData[]. I thought I needed to export the data with "Bit16", I didn't realize (or forgot) I needed to use it with ImageData[] too. Now I get the expected 16 bit integers in import using Image`ImportExportDump`ImageReadTIFF :

SetDirectory[NotebookDirectory[]];
im1 = Image[RandomInteger[{0, 65535}, {512, 512}], "Bit16"];
Export["im1.tiff", im1];
im2 = Image`ImportExportDump`ImageReadTIFF[
AbsoluteFileName["im1.tiff"]][[1]];
ImageData[im1, "Bit16"][[1, 1]]
ImageData[im2, "Bit16"][[1, 1]]
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