Can't generate thumbnail for some DNG file #2395

fuji246 · 2021-08-14T04:30:46Z

fuji246
Aug 14, 2021

Questions, enhancements, tips, etc.

Please use libvips discussions for other topics.

https://github.com/libvips/libvips/discussions

Bug report

Describe the bug
A clear and concise description of what the bug is.

$ vipsthumbnail 33496.dng 

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.600: Nonstandard tile width 504, convert file

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.601: Nonstandard tile length 378, convert file

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.601: Unknown field with tag 50935 (0xc6f7) encountered

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.601: Unknown field with tag 51022 (0xc74e) encountered

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.601: Unknown field with tag 51041 (0xc761) encountered

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.602: Nonstandard tile width 504, convert file

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.602: Nonstandard tile length 378, convert file

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.602: Unknown field with tag 50935 (0xc6f7) encountered

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.602: Unknown field with tag 51022 (0xc74e) encountered

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.602: Unknown field with tag 51041 (0xc761) encountered

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.602: Nonstandard tile width 504, convert file

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.602: Nonstandard tile length 378, convert file

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.602: Unknown field with tag 50935 (0xc6f7) encountered

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.602: Unknown field with tag 51022 (0xc74e) encountered

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.602: Unknown field with tag 51041 (0xc761) encountered

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.603: Nonstandard tile width 504, convert file

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.603: Nonstandard tile length 378, convert file

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.603: Unknown field with tag 50935 (0xc6f7) encountered

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.603: Unknown field with tag 51022 (0xc74e) encountered

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.603: Unknown field with tag 51041 (0xc761) encountered

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.603: Nonstandard tile width 504, convert file

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.603: Nonstandard tile length 378, convert file

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.603: Unknown field with tag 50935 (0xc6f7) encountered

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.603: Unknown field with tag 51022 (0xc74e) encountered

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.603: Unknown field with tag 51041 (0xc761) encountered

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.603: Nonstandard tile width 504, convert file

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.603: Nonstandard tile length 378, convert file

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.603: Unknown field with tag 50935 (0xc6f7) encountered

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.603: Unknown field with tag 51022 (0xc74e) encountered

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.603: Unknown field with tag 51041 (0xc761) encountered

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.604: Nonstandard tile width 504, convert file

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.604: Nonstandard tile length 378, convert file

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.604: Unknown field with tag 50935 (0xc6f7) encountered

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.604: Unknown field with tag 51022 (0xc74e) encountered

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.604: Unknown field with tag 51041 (0xc761) encountered

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.605: Nonstandard tile width 504, convert file

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.605: Nonstandard tile length 378, convert file

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.605: Unknown field with tag 50935 (0xc6f7) encountered

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.605: Unknown field with tag 51022 (0xc74e) encountered

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.605: Unknown field with tag 51041 (0xc761) encountered

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.605: Nonstandard tile width 504, convert file

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.605: Nonstandard tile length 378, convert file

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.605: Unknown field with tag 50935 (0xc6f7) encountered

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.605: Unknown field with tag 51022 (0xc74e) encountered

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.605: Unknown field with tag 51041 (0xc761) encountered

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.605: Nonstandard tile width 504, convert file

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.605: Nonstandard tile length 378, convert file

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.605: Unknown field with tag 50935 (0xc6f7) encountered

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.605: Unknown field with tag 51022 (0xc74e) encountered

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.605: Unknown field with tag 51041 (0xc761) encountered

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.605: Nonstandard tile width 504, convert file

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.605: Nonstandard tile length 378, convert file

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.605: Unknown field with tag 50935 (0xc6f7) encountered

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.605: Unknown field with tag 51022 (0xc74e) encountered

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.605: Unknown field with tag 51041 (0xc761) encountered

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.613: Nonstandard tile width 504, convert file

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.613: Nonstandard tile length 378, convert file

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.613: Unknown field with tag 50935 (0xc6f7) encountered

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.613: Unknown field with tag 51022 (0xc74e) encountered

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.613: Unknown field with tag 51041 (0xc761) encountered

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.613: Nonstandard tile width 504, convert file

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.613: Nonstandard tile length 378, convert file

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.613: Unknown field with tag 50935 (0xc6f7) encountered

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.613: Unknown field with tag 51022 (0xc74e) encountered

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.613: Unknown field with tag 51041 (0xc761) encountered

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.613: Nonstandard tile width 504, convert file

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.613: Nonstandard tile length 378, convert file

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.613: Unknown field with tag 50935 (0xc6f7) encountered

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.613: Unknown field with tag 51022 (0xc74e) encountered

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.613: Unknown field with tag 51041 (0xc761) encountered

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.615: error in tile 0 x 0

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.617: error in tile 504 x 0

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.618: error in tile 1008 x 0

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.621: error in tile 1512 x 0

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.621: error in tile 2016 x 0

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.622: error in tile 2520 x 0

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.622: error in tile 3024 x 0

(vipsthumbnail:33468): VIPS-WARNING **: 21:24:53.626: error in tile 3528 x 0
vipsthumbnail: unable to thumbnail 33496.dng
JPEGLib: Unsupported JPEG process: SOF type 0xc3
JPEGLib: Unsupported JPEG process: SOF type 0xc3
JPEGLib: Unsupported JPEG process: SOF type 0xc3
JPEGLib: Unsupported JPEG process: SOF type 0xc3
JPEGLib: Unsupported JPEG process: SOF type 0xc3
JPEGLib: Unsupported JPEG process: SOF type 0xc3
JPEGLib: Unsupported JPEG process: SOF type 0xc3
JPEGLib: Unsupported JPEG process: SOF type 0xc3

To Reproduce
Steps to reproduce the behavior:

Use Image '...'
Use Configuration '....'
See error
IMG_885.DNG.zip

use "vipsthumbnail" to run with the DNG file uploaded

Expected behavior
A clear and concise description of what you expected to happen.

Thumbnail generated

Actual behavior
A clear and concise description of what actually happen.

Error printed and no thumbnail generated

Screenshots
If applicable, add screenshots to help explain your problem.

Environment
(please complete the following information)

OS: [e.g. Ubuntu 16.04, MacOS 10.13]
Vips: [e.g. 8.8, 8.9, etc]

MacOS 11.3

vipsthumbnail --vips-version
libvips 8.11.2-Sat Jul 3 14:17:10 UTC 2021

Additional context
Add any other context about the problem here.

jcupitt · 2021-08-14T08:34:52Z

jcupitt
Aug 14, 2021
Maintainer

Hello @fuji246, libvips does not support DNG files. You'll need a specialized converter.

0 replies

kleisauke · 2025-08-15T13:21:52Z

kleisauke
Aug 15, 2025
Maintainer

A dedicated LibRaw loader is now available on the master branch (which will be part of the upcoming 8.18 release).

0 replies

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Can't generate thumbnail for some DNG file #2395

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fuji246 Aug 14, 2021

Questions, enhancements, tips, etc.

Bug report

Replies: 2 comments

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jcupitt Aug 14, 2021 Maintainer

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kleisauke Aug 15, 2025 Maintainer

fuji246
Aug 14, 2021

jcupitt
Aug 14, 2021
Maintainer

kleisauke
Aug 15, 2025
Maintainer