;-- TIME_STAMP   2022-09-30 12:10:37

_TestBrightness(0xF5F5DC, 2)
_TestBrightness(0x0000FF, 10)
_TestBrightness(0xE9967A, 4)



Func _TestBrightness($_RGB, $_step)
    Local $hGui = GUICreate('Test Brightness', 400, 200)
    Local $RGB2 = $_RGB, $aL1[6], $aL2[6], $y
    GUICtrlCreateLabel('AUFHELLEN', 10, 10)
    GUICtrlCreateLabel('ABDUNKELN', 200, 10)
    For $i = 0 To UBound($aL1) -1
        $y = 30 + $i*21
        $aL1[$i] = GUICtrlCreateLabel('', 10, $y, 180, 20)
        $aL2[$i] = GUICtrlCreateLabel('', 200, $y, 180, 20)
    Next
    GUICtrlSetBkColor($aL1[0], $_RGB)
    GUICtrlSetBkColor($aL2[0], $RGB2)
    For $i = 1 To UBound($aL1) -1
        $_RGB = _GetColorWithBrightness($_RGB, $_step)
        GUICtrlSetBkColor($aL1[$i], $_RGB)
        $RGB2 = _GetColorWithBrightness($RGB2, (-1)*$_step)
        GUICtrlSetBkColor($aL2[$i], $RGB2)
    Next

    GUISetState()
    Do
    Until GUIGetMsg() = -3
    GUIDelete($hGui)
EndFunc


; #FUNCTION# =======================================================================================
; Name ..........: _GetColorWithBrightness
; Description ...: Gibt zu einer Farbe die auf einen Helligkeitswert geänderte Farbe zurück
; Parameter(s)...: $_RGB
; ....[optional].: $_iStep        Zur Änderung der Helligkeit um einzelne Schritte (+/-), (Default: 0)
; ...............:                Nur wirksam, wenn "$_iBrightness=Null".
; ....[optional].: $_iBrightness  Zur Änderung der Helligkeit auf einen fixen Wert (Default: Null)
; Return values .: Success        Der neue Farbwert
; ...............: Failure        Der Farbwert, wie übergeben ($_iStep/$_iBrightness nicht angegeben)
; Author ........: BugFix
; ==================================================================================================
Func _GetColorWithBrightness($_RGB, $_iStep=0, $_iBrightness=Null)
    Local $R = BitAND(BitShift($_RGB, 16), 0xFF)
    Local $G = BitAND(BitShift($_RGB, 8), 0xFF)
    Local $B = BitAND($_RGB, 0xFF)
    Local $R1 = $R, $G1 = $G, $B1 = $B
    Local $Brightness = Int(Sqrt($R^2*0.299 + $G^2*0.587 + $B^2*0.114))
    If $_iBrightness = Null Then ; Schrittweite wird verwendet
        $_iBrightness = $Brightness + ($_iStep)
    EndIf
    $_iBrightness = $_iBrightness < 0 ? 0 : ($_iBrightness > 255 ? 255 : $_iBrightness)
    If $_iBrightness > $Brightness Then
        While $Brightness < $_iBrightness
            $R1 = $R1 +1 > 255 ? 255 : $R1 +1
            $G1 = $G1 +1 > 255 ? 255 : $G1 +1
            $B1 = $B1 +1 > 255 ? 255 : $B1 +1
            $Brightness = Int(Sqrt($R1^2*0.299 + $G1^2*0.587 + $B1^2*0.114))
        WEnd
    ElseIf $_iBrightness < $Brightness Then
        While $Brightness > $_iBrightness
            $R1 = $R1 -1 < 0 ? 0 : $R1 -1
            $G1 = $G1 -1 < 0 ? 0 : $G1 -1
            $B1 = $B1 -1 < 0 ? 0 : $B1 -1
            $Brightness = Int(Sqrt($R1^2*0.299 + $G1^2*0.587 + $B1^2*0.114))
        WEnd
    EndIf
    Return '0x' & Hex($R1,2) & Hex($G1,2) & Hex($B1,2)
EndFunc