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Subject: [OASIS Issue Tracker] Created: (OFFICE-3830) draw:gamma has no algorithm for calculating the output color


draw:gamma has no algorithm for calculating the output color
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                 Key: OFFICE-3830
                 URL: http://tools.oasis-open.org/issues/browse/OFFICE-3830
             Project: OASIS Open Document Format for Office Applications (OpenDocument) TC
          Issue Type: Sub-task
          Components: Graphics
    Affects Versions: ODF 1.2
            Reporter: Regina Henschel
             Fix For: ODF 1.3


The attribute draw:gamma (section 20.128, ODF1.2 part 1) has no description, how to calculate the output color. Such description is needed, because there exists no standard for "gamma". For example in some situations ^value and in other situations ^(1/value) is used.

The .png format has a chunk gAMA, which holds a gamma value. http://www.w3.org/TR/PNG/#3gamma. And in that specification you get a detailed description, how this value is to be used for displaying a .png picture. http://www.w3.org/TR/PNG/#13Decoder-gamma-handling.

ODF should provide a description too. The mail https://www.oasis-open.org/apps/org/workgroup/office/email/archives/201304/msg00030.html has an attachment, which describes how Apache OpenOffice calculates the output color. I don't know how other application do it. 

The specification needs in addition a rule for the order in which the color and tone adjustments are applied, see other subtask.

The value of draw:gamma should be restricted to positive values, because negative values and zero make no sense. 

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