wow, gdiplus is so difficult ! this is what i got so far in my Image Editing project (a little bit chaotic, yes i know) :
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#include <GDIPlus.au3>
#include <SliderConstants.au3>
Opt("GUIOnEventMode",1)
Global Const $SRCCOPY=0xCC0020
Global Const $SB_ENDSCROLL=8
Global Const $SB_THUMBPOSITION=4
Global Const $GDIP_BRIGHTNESSCONTRASTEFFECT="{D3A1DBE1-8EC4-4c17-9F4C-EA97AD1C343D}"
Global Const $GDIP_BLUREFFECT="{633C80A4-1843-482b-9EF2-BE2834C5FDD4}"
Global Const $GDIP_SHARPENEFFEC