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devel / comp.protocols.dicom / Combine Photometric Interpretation and Presentation LUT Shape

SubjectAuthor
* Combine Photometric Interpretation and Presentation LUT ShapeNicolas Roduit
`* Re: Combine Photometric Interpretation and Presentation LUT ShapeDavid Clunie
 `- Re: Combine Photometric Interpretation and Presentation LUT ShapeNicolas Roduit

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Combine Photometric Interpretation and Presentation LUT Shape

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Subject: Combine Photometric Interpretation and Presentation LUT Shape
From: nicolas.roduit@gmail.com (Nicolas Roduit)
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 by: Nicolas Roduit - Thu, 9 Feb 2023 10:53 UTC

Thank you if someone can help me to understand how the image below should be rendered.

DICOM image: https://github.com/nroduit/Weasis/files/10694697/inverted2.zip

The values are
(0028,0004) CS PhotometricInterpretation MONOCHROME1
(2050,0020) CS PresentationLUTShape INVERSE

According to this post (https://groups.google.com/g/comp.protocols.dicom/c/Wzt_06RbF5c), the result should make a double LUT inversion and we should obtain the following result:
https://user-images.githubusercontent.com/993975/217784490-0050286b-0cd1-4f65-bfe7-24fe25cca0db.png

Re: Combine Photometric Interpretation and Presentation LUT Shape

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Subject: Re: Combine Photometric Interpretation and Presentation LUT Shape
From: dclunie@dclunie.com (David Clunie)
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 by: David Clunie - Thu, 9 Feb 2023 12:56 UTC

No.

The rendered image is incorrectly inverted.

The stored pixel values in the DICOM image "inverted2" are such that background air numeric values are higher than soft tissue, and PhotometricInterpretation MONOCHROME1/PresentationLUTShape INVERSE (which are consistent as required per Jörg's explanation) says that higher stored pixel values should be black, not white.

Jörg's post does NOT call for a "double LUT inversion" as you suggest, but rather explains where in the standard it says that PhotometricInterpretation and PresentationLUTShape are required to be consistent (not in conflict with each other).

David

On Thursday, February 9, 2023 at 5:53:03 AM UTC-5, Nicolas Roduit wrote:
> Thank you if someone can help me to understand how the image below should be rendered.
>
> DICOM image: https://github.com/nroduit/Weasis/files/10694697/inverted2.zip
>
> The values are
> (0028,0004) CS PhotometricInterpretation MONOCHROME1
> (2050,0020) CS PresentationLUTShape INVERSE
>
> According to this post (https://groups.google.com/g/comp.protocols.dicom/c/Wzt_06RbF5c), the result should make a double LUT inversion and we should obtain the following result:
> https://user-images.githubusercontent.com/993975/217784490-0050286b-0cd1-4f65-bfe7-24fe25cca0db.png

Re: Combine Photometric Interpretation and Presentation LUT Shape

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Subject: Re: Combine Photometric Interpretation and Presentation LUT Shape
From: nicolas.roduit@gmail.com (Nicolas Roduit)
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 by: Nicolas Roduit - Thu, 9 Feb 2023 13:33 UTC

Thank you David for this clarification. That was my first understanding.

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