Decoding J2K RGB files - invalid value for 'PhotometricInterpretation' (YBR_RCT)

[Michael-Preibisch]

Hello,

I'm having an issue when trying to decode RGB JPEG2000 files by using this codec. DCMTK console log is as follows:

E: invalid value for 'PhotometricInterpretation' (YBR_ICT)

or

E: invalid value for 'PhotometricInterpretation' (YBR_RCT)

The problem is with many files, but to this post I attach two of them (YBR_RCT anf YBR_ICT).
All of failing files share the same image-related attributes:
"BitsStored" -> 8,
"BitsAllocated" -> 8,
"HighBit" -> 7,
"SamplesPerPixel" -> 3

"PhotometricInterpretation" -> YBR_ICT or YBR_RCT

I am able to read MONOCHROME2 JPEG2000 files with your codec.

Example files:
https://drive.google.com/open?id=10JsJpsp3zNc2vUBdEkn8QK3UmL0Tq9HT

I'd be really grateful if you could help me.
Cheers,
M

[stiftovich]

Hello,

i had the same problem like you with some dicom files i got from an institution.
I looked into the DICOM standard and found out, that the photometric interpretation must be changed to RGB after decompression. Found here http://dicom.nema.org/medical/dicom/2017e/output/chtml/part05/sect_8.2.4.html in Note 5)

So, to successfully decode the dataset i have done the following:
DcmFileFormat format;
format.loadFile(fileName, EXS_Unknown, EGL_noChange, DCM_MaxReadLength, ERM_autoDetect);
DcmDataset* ds = format.getAndRemoveDataset();
ds->putAndInsertString(DCM_PhotometricInterpretation, "RGB");

I create a DicomImage then and process it further. This works for the test files you provided.
Hope that helps you!

Cheers
Chris