# Adjusting Brightness of Object

**URL:** <https://forum.kirupa.com/t/adjusting-brightness-of-object/260423>\
**Category:** flash\
**Created:** [May 15, 2008, 1:59pm UTC](https://forum.kirupa.com/t/adjusting-brightness-of-object/260423 "2008-05-15T13:59:23Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![vivaretro](https://avatars.discourse-cdn.com/v4/letter/v/a3d4f5/32.png) [@vivaretro](https://forum.kirupa.com/u/vivaretro)\
**Post date:** [May 15, 2008, 1:59pm UTC](https://forum.kirupa.com/t/adjusting-brightness-of-object/260423/1 "2008-05-15T13:59:23Z")

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Having trouble understanding how to adjust the brightness of an object (in this case  
a symbol from an imported Illustrator file). I’ve read the help sections on it but remain  
clueless. Any help much appreciated!

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<div class="post-metadata">

**Author:** ![Felixz](https://avatars.discourse-cdn.com/v4/letter/f/ecb155/32.png) [@Felixz](https://forum.kirupa.com/u/Felixz)\
**Post date:** [May 15, 2008, 4:39pm UTC](https://forum.kirupa.com/t/adjusting-brightness-of-object/260423/2 "2008-05-15T16:39:37Z")

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I use this

```auto
const LUM_R:Number=0.212671,LUM_G:Number=0.715160,LUM_B:Number=0.072169;
var strength:Number=getStrength(),invert:Number=1 - strength,r:Number=0x00,g:Number=0x00,b:Number=0x00;
content.filters=[new ColorMatrixFilter([invert + strength * r * LUM_R, strength * r * LUM_G, strength * r * LUM_B, 0, 0, strength * g * LUM_R, invert + strength * g * LUM_G, strength * g * LUM_B, 0, 0, strength * b * LUM_R, strength * b * LUM_G, invert + strength * b * LUM_B, 0, 0, 0, 0, 0, 1, 0])];

```

getStrength() is a function returning var from -1 to 1

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<div class="post-metadata">

**Author:** ![vivaretro](https://avatars.discourse-cdn.com/v4/letter/v/a3d4f5/32.png) [@vivaretro](https://forum.kirupa.com/u/vivaretro)\
**Post date:** [May 15, 2008, 5:23pm UTC](https://forum.kirupa.com/t/adjusting-brightness-of-object/260423/3 "2008-05-15T17:23:56Z")

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Thanks!  
What is the syntax for applying this to a movieclip?  
forgive the newbie question:)  
And does that only work on bitmap?

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<div class="post-metadata">

**Author:** ![Felixz](https://avatars.discourse-cdn.com/v4/letter/f/ecb155/32.png) [@Felixz](https://forum.kirupa.com/u/Felixz)\
**Post date:** [May 15, 2008, 8:12pm UTC](https://forum.kirupa.com/t/adjusting-brightness-of-object/260423/4 "2008-05-15T20:12:09Z")

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content is your MovieClip

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<div class="post-metadata">

**Author:** ![vivaretro](https://avatars.discourse-cdn.com/v4/letter/v/a3d4f5/32.png) [@vivaretro](https://forum.kirupa.com/u/vivaretro)\
**Post date:** [May 16, 2008, 3:39pm UTC](https://forum.kirupa.com/t/adjusting-brightness-of-object/260423/5 "2008-05-16T15:39:02Z")

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Thanks! Now I get it. Thank you very much!