No, there was no expectation that during printing of a
color image that an actual Presentation LUT would ever
be applied to a color image, whether it be to the
luminance channel or otherwise. This is distinct from
printing a grayscale image on a color printer.

We never really considered the issues involved in using
DICOM color printing from a consistency perspective;
the ICC profile stuff that we add for color presentation
states was only considered from a softcopy perspective;
we did not add a mechanism for conveying the ICC profile
in the print request, though in retrospect that might
be a good thing to do.

Also, in general, folks rarely if ever actually use a
Presentation LUT that is not IDENTITY or INVERSE, for
softcopy or printing, with the one exception being to
try to stuff a > 8 bit image through an 8 bit printer
path by choosing a LUT shape that avoids quantization
in regions where it is a problem.

Or, to put it another way, avoid the Presentation LUT.

David

When we added the color presentation stat

Grave Digger wrote:
> In the 2004 DICOM Standard 04_03pu2 page 271
> Table C.7-9 General Image Module Attributes the following text appears
> in the far right side of the table
>
> "When present, specifies an identity
> transformation for the Presentation LUT
> such that the output of all grayscale
> transformations, if any, are defined to be
> in P-Values.
> Enumerated Values are:
> IDENTITY - output is in P-Values - shall
> be used if Photometric Interpretation
> (0028,0004) is MONOCHROME2 or any
> color photometric interpretation.
> INVERSE - output after inversion is in PValues
> - shall be used if Photometric
> Interpretation (0028,0004) is
> MONOCHROME1.
> When this attribute is used with a color
> photometric interpretation then the
> luminance component is in P-Values."
>
> But I am not able to find any other instance of applying a Presentation
> LUT sequence to color images.
>
> Is it valid to apply Presentation LUT sequences to the Luminance channel
> of an image when providing Hard copy functionality ?
> In other words I am trying to determine is a Print SCU implementation
> may apply a Presentation LUT sequence to a color image or not.
> Thank you in advance, and also for previous responders about
> Presentation LUTs.

Thank you. Now my job is a whole lot easier.

David Clunie wrote:
> No, there was no expectation that during printing of a
> color image that an actual Presentation LUT would ever
> be applied to a color image, whether it be to the
> luminance channel or otherwise. This is distinct from
> printing a grayscale image on a color printer.
>
> We never really considered the issues involved in using
> DICOM color printing from a consistency perspective;
> the ICC profile stuff that we add for color presentation
> states was only considered from a softcopy perspective;
> we did not add a mechanism for conveying the ICC profile
> in the print request, though in retrospect that might
> be a good thing to do.
>
> Also, in general, folks rarely if ever actually use a
> Presentation LUT that is not IDENTITY or INVERSE, for
> softcopy or printing, with the one exception being to
> try to stuff a > 8 bit image through an 8 bit printer
> path by choosing a LUT shape that avoids quantization
> in regions where it is a problem.
>
> Or, to put it another way, avoid the Presentation LUT.
>
> David
>
> When we added the color presentation stat
>
> Grave Digger wrote:
>> In the 2004 DICOM Standard 04_03pu2 page 271
>> Table C.7-9 General Image Module Attributes the following text appears
>> in the far right side of the table
>>
>> "When present, specifies an identity
>> transformation for the Presentation LUT
>> such that the output of all grayscale
>> transformations, if any, are defined to be
>> in P-Values.
>> Enumerated Values are:
>> IDENTITY - output is in P-Values - shall
>> be used if Photometric Interpretation
>> (0028,0004) is MONOCHROME2 or any
>> color photometric interpretation.
>> INVERSE - output after inversion is in PValues
>> - shall be used if Photometric
>> Interpretation (0028,0004) is
>> MONOCHROME1.
>> When this attribute is used with a color
>> photometric interpretation then the
>> luminance component is in P-Values."
>>
>> But I am not able to find any other instance of applying a Presentation
>> LUT sequence to color images.
>>
>> Is it valid to apply Presentation LUT sequences to the Luminance channel
>> of an image when providing Hard copy functionality ?
>> In other words I am trying to determine is a Print SCU implementation
>> may apply a Presentation LUT sequence to a color image or not.
>> Thank you in advance, and also for previous responders about
>> Presentation LUTs.