DICOM tag value changes after resaving

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Xen
Xen 2022-7-15
I modified a DICOM tag from a DICOM image that has an embedded color lut (photometric interpretation = PALETTE COLOR). When I resave the DICOM image with the modified tag the photometric interpretation is changed to MONOCHROME2, therefore the image is shown in grayscale rather than the original colors when viewed in a DICOM viewer. I am using the
'CreateMode', 'Copy'
argument which preserves the whole original header except that specific tag. How can I preserve this also?
Thanks.

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