Color Brightness correction

Question

Open XML Tag

<a:schemeClr val="accent1">
     <a:shade val="67500" />
    <a:satMod val="115000" />
    <a:lumMod val="75000" />
</a:schemeClr>

I set -25% brightness from power-point. How to set lumMod in color my accent1 color value is #897ABA. and how to check in openxml color brightness is -25%;

Answer 1

Hi adesh1606,

Thank you for submitting this question. One of our staff members will investigate this and follow-up soon.

Regards,

Edgar

Answer 2

Hi adesh1606,

[MS-OI29500] 2.1.1230 "Part 1 Section 20.1.2.3.20, lumMod (Luminance Modulation)" (https://docs.microsoft.com/en-us/openspecs/office_standards/ms-oi29500/bbae8916-01d7-48ac-ae07-ff5d30130967) states: 

For additional notes that apply to this portion of the standard, please see the notes for blue,
§20.1.2.3.4(a).
a. The standard states that ST_PositiveFixedPercentage is read and written as a percent with a
trailing percent sign.
Office will read in percentages formatted with a trailing percent sign or as 1000th of a percent
without trailing percent sign, but only write out percentages as 1000th's of a percent without
trailing percent sign.

The value you entered translates to the emitted value of 75000 which is 1000th of a percent * 75000 or 75%. This means you've reduced the luminance of the color by 25% or to 75%. 

Tom