Missing Exif metadata when `vips copy` to JXL #4173

cmahnke · 2024-09-29T08:27:24Z

cmahnke
Sep 29, 2024

I'm not sure if this is a missing feature, a bug or something else:
When converting a TIFF file to JXL using vips copy the Exif metadata is missing, in general Exif in JXL is a problem, the encoder provided by LibJXL, cjxl has it's problem as well. I also tried to use exiv2 and exiftool but had no luck. Theew are indications on the web that the later might work, but didn't manage to get it to work with an image created by vips copy - maybe there is a required container missing?

How are other doing this?

Edit

It seems that exiftool installed via brew doesn't bundle IO::Compress::Brotli and IO::Uncompress::Brotli required for JXL, see https://github.com/exiftool/exiftool/blob/master/README
I've created an issue: Homebrew/homebrew-core#192273

But am still interested in your workflows / ideas

jcupitt · 2024-09-29T10:47:31Z

jcupitt
Sep 29, 2024
Maintainer

Hello @cmahnke,

TIFF has its own strange way of handling exif (it appears as a TIFF subdirectory) and libvips doesn't support this. We've talked a few times about adding EXIF support to the tiff loader, but it's not straightforward and no one's done it. The libvips TIFF loader does support XMP, IPTC, ICC etc. and they should all work with JXL.

libvips 8.16, due soon, supports EXIF in JXL. For example with this test image:

$ vipsheader -a k2.jpg
k2.jpg: 1450x2048 uchar, 3 bands, srgb, jpegload
width: 1450
height: 2048
bands: 3
format: uchar
coding: none
interpretation: srgb
xoffset: 0
yoffset: 0
xres: 2.835
yres: 2.835
filename: k2.jpg
vips-loader: jpegload
jpeg-multiscan: 0
jpeg-chroma-subsample: 4:2:0
exif-data: 186 bytes of binary data
resolution-unit: in
exif-ifd0-Orientation: 1 (Top-left, Short, 1 components, 2 bytes)
exif-ifd0-XResolution: 72009/1000 (72.009, Rational, 1 components, 8 bytes)
exif-ifd0-YResolution: 72009/1000 (72.009, Rational, 1 components, 8 bytes)
exif-ifd0-ResolutionUnit: 2 (Inch, Short, 1 components, 2 bytes)
exif-ifd0-YCbCrPositioning: 1 (Centred, Short, 1 components, 2 bytes)
exif-ifd2-ExifVersion: Exif Version 2.1 (Exif Version 2.1, Undefined, 4 components, 4 bytes)
exif-ifd2-ComponentsConfiguration: Y Cb Cr - (Y Cb Cr -, Undefined, 4 components, 4 bytes)
exif-ifd2-FlashpixVersion: FlashPix Version 1. (FlashPix Version 1., Undefined, 4 components, 4 bytes)
exif-ifd2-ColorSpace: 65535 (65535, Short, 1 components, 2 bytes)
exif-ifd2-PixelXDimension: 1450 (1450, Long, 1 components, 4 bytes)
exif-ifd2-PixelYDimension: 2048 (2048, Long, 1 components, 4 bytes)
orientation: 1

I see:

$ vips copy k2.jpg x.jxl
$ vipsheader -a memory: high-water mark 11.90 MB
x.jxl: 1450x2048 uchar, 3 bands, srgb, jxlload
width: 1450
height: 2048
bands: 3
format: uchar
coding: none
interpretation: srgb
xoffset: 0
yoffset: 0
xres: 2.835
yres: 2.835
filename: x.jxl
vips-loader: jxlload
icc-profile-data: 536 bytes of binary data
exif-data: 186 bytes of binary data
resolution-unit: in
exif-ifd0-Orientation: 1 (Top-left, Short, 1 components, 2 bytes)
exif-ifd0-XResolution: 72009/1000 (72.009, Rational, 1 components, 8 bytes)
exif-ifd0-YResolution: 72009/1000 (72.009, Rational, 1 components, 8 bytes)
exif-ifd0-ResolutionUnit: 2 (Inch, Short, 1 components, 2 bytes)
exif-ifd0-YCbCrPositioning: 1 (Centred, Short, 1 components, 2 bytes)
exif-ifd2-ExifVersion: Exif Version 2.1 (Exif Version 2.1, Undefined, 4 components, 4 bytes)
exif-ifd2-ComponentsConfiguration: Y Cb Cr - (Y Cb Cr -, Undefined, 4 components, 4 bytes)
exif-ifd2-FlashpixVersion: FlashPix Version 1. (FlashPix Version 1., Undefined, 4 components, 4 bytes)
exif-ifd2-ColorSpace: 65535 (65535, Short, 1 components, 2 bytes)
exif-ifd2-PixelXDimension: 1450 (1450, Long, 1 components, 4 bytes)
exif-ifd2-PixelYDimension: 2048 (2048, Long, 1 components, 4 bytes)
orientation: 1
bits-per-sample: 8

3 replies

cmahnke Sep 29, 2024
Author

Thanks, I guess I'm not really stuck with Exif. Sure the scanner provides this (no XMP data is added) but it should be possible to add some translation step into the processing workflow before passing it to vips, but I need to check if tool like jxlpy can handle them.

I also figured out how to solve the container problem with exiftool, one needs to add the -m option to create missing containers.

Qhilm Oct 22, 2024

Just a clarification, -m is for --ignoreMinorErrors not really for creating missing containers.

cmahnke Oct 23, 2024
Author

Thanks @Qhilm
But it works as expected anyways

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jcupitt Sep 29, 2024 Maintainer

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cmahnke Oct 23, 2024 Author

Missing Exif metadata when `vips copy` to JXL #4173

cmahnke
Sep 29, 2024

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jcupitt
Sep 29, 2024
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cmahnke Sep 29, 2024
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cmahnke Oct 23, 2024
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