Dicom 1.2.840.10008.1.2.4.70 not supported?

[blazespinnaker]

Have you searched the existing issues (both open and closed) in the libjpeg-turbo issue tracker to ensure that this bug report is not a duplicate?

Yes

Does this bug report describe one of the two known and unsolvable issues with the JPEG format?
No

Clear and concise description of the bug:
Getting error when decoding dicom jpg with transfer syntax 1.2.840.10008.1.2.4.70

Unsupported JPEG process: SOF type 0xc3

Steps to reproduce the bug (using only libjpeg-turbo):

This works:

from libjpeg import decode
arr = decode('/kaggle/working/1_2_840_10008_1_2_4_70.jpg')
import matplotlib.pyplot as plt
plt.imshow(arr)
plt.show() 

This does not:

jpeg = TurboJPEG()
in_file = open('/kaggle/working/1_2_840_10008_1_2_4_70.jpg', 'rb')
arr = jpeg.decode(in_file.read())

OSError: Unsupported JPEG process: SOF type 0xc3

Image(s) needed in order to reproduce the bug (if applicable):

https://github.com/blazespinnaker/klibs/blob/main/1_2_840_10008_1_2_4_70.jpg

Expected behavior:

Expected turbojpeg to decode the file

Observed behavior:

Error

Platform(s) (compiler version, operating system version, CPU) on which the bug was observed:

Linux Ubuntu

libjpeg-turbo release(s), commit(s), or branch(es) in which the bug was observed (always test the tip of the main branch or the latest stable pre-release to verify that the bug hasn't already been fixed):

Using this library https://github.com/lilohuang/PyTurboJPEG

If the bug is a regression, the specific commit that introduced the regression (use git bisect to determine this):
I don't think it's a regresssion

Additional information:

[dcommander]

Duplicate of #402. Not a bug. This is simply that, historically, libjpeg and its derivatives never supported lossless JPEG. I am in the process of implementing that support under contract.

[dcommander]

8-bit, 12-bit, and 16-bit lossless JPEG is fully implemented in both the libjpeg and TurboJPEG APIs in the dev branch, and the beta release containing the feature will land early next week.