[Bug 25752] Brightnes and contrast level not same

[bu...@apache.org]

https://issues.apache.org/ooo/show_bug.cgi?id=25752

Regina Henschel <rb...@t-online.de> changed:

           What    |Removed                     |Added
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                 CC|                            |rb.henschel@t-online.de

--- Comment #8 from Regina Henschel <rb...@t-online.de> ---
Created attachment 80871
  --> https://issues.apache.org/ooo/attachment.cgi?id=80871&action=edit
Document with one picture

In AOO luminance and contrast are not absolute values but offset to the
original colors of the image. Therefore a negative value makes sense, it means
a decrease of the color value and a positive number means an increase of the
color value.

Old versions of Word uses a range from 0% to 100%, where 50% means the original
values. Newer versions of Word like Word 2010 use a range from -100% to 100%
with 0% as original values. A picture with luminance -20% in new Word version
has luminance 30% in in old Word version and contrast of +10% in new Word
version is 60% in old Word versions.

If you open the attached document in Word 2010 and use the picture tools on the
picture, you see the new values directly in the drop-down list and the old
values when you open the more... field from the drop-down list.

The import in AOO is wrong. Instead of -20% the value -40% is used and instead
of +10% the value +20% is used.

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