Need advice for color comparison

[RichardAR]

Hello. I am working on a script that constantly needs to check pixel color within a tolerance. This is because the program I am scripting for has text and other window elements that constantly change within a tolerance depending on the view of the camera in the 3d environment, or if the background is dark or bright. I haven't figured out what the tolerance range is, however I have wrote this function to do a color comparison and I need advice on how to do it properly.

Func IsColorMatch($color1, $color2, $threshMax, $threshMin = 0)
    $r1 = _ColorGetRed($color1)
    $g1 = _ColorGetGreen($color1)
    $b1 = _ColorGetBlue($color1)
    $r2 = _ColorGetRed($color2)
    $g2 = _ColorGetGreen($color2)
    $b2 = _ColorGetBlue($color2)
    $dr = Abs($r1 - $r2)
    $dg = Abs($g1 - $g2)
    $db = Abs($b1 - $b2)
    $tr = (($dr >= $threshMin) And ($dr <= $threshMax))
    $tg = (($dg >= $threshMin) And ($dg <= $threshMax))
    $tb = (($db >= $threshMin) And ($db <= $threshMax))
    Return $tr And $tg And $tb
EndFunc

[jvanegmond]

Snippet from my code library:

Func _ColorInBounds($pMColor, $pTColor, $pVariation)
    $lMCBlue = _ColorGetBlue($pMColor)
    $lMCGreen = _ColorGetGreen($pMColor)
    $lMCRed = _ColorGetRed($pMColor)
    
    $lTCBlue = _ColorGetBlue($pTColor)
    $lTCGreen = _ColorGetGreen($pTColor)
    $lTCRed = _ColorGetRed($pTColor)
    
    $a = Abs($lMCBlue - $lTCBlue)
    $b = Abs($lMCGreen - $lTCGreen)
    $c = Abs($lMCRed - $lTCRed)
    
    If ( ( $a < $pVariation ) AND ( $b < $pVariation ) AND ( $c < $pVariation ) ) Then
        Return 1
    Else
        Return 0
    EndIf
EndFunc

[martin]

Hello. I am working on a script that constantly needs to check pixel color within a tolerance. This is because the program I am scripting for has text and other window elements that constantly change within a tolerance depending on the view of the camera in the 3d environment, or if the background is dark or bright. I haven't figured out what the tolerance range is, however I have wrote this function to do a color comparison and I need advice on how to do it properly.

Func IsColorMatch($color1, $color2, $threshMax, $threshMin = 0)
    $r1 = _ColorGetRed($color1)
    $g1 = _ColorGetGreen($color1)
    $b1 = _ColorGetBlue($color1)
    $r2 = _ColorGetRed($color2)
    $g2 = _ColorGetGreen($color2)
    $b2 = _ColorGetBlue($color2)
    $dr = Abs($r1 - $r2)
    $dg = Abs($g1 - $g2)
    $db = Abs($b1 - $b2)
    $tr = (($dr >= $threshMin) And ($dr <= $threshMax))
    $tg = (($dg >= $threshMin) And ($dg <= $threshMax))
    $tb = (($db >= $threshMin) And ($db <= $threshMax))
    Return $tr And $tg And $tb
EndFunc

It doesn't look quite right to me. For example

$tr = (($dr >= $threshMin) And ($dr <= $threshMax))

is to decide if the red component is out of tolerance, but it will only be true if both conditions are met which is when the difference is exactly equal to the allowed tolerance. I think it should be

$tr = $dr > $threshMin

Then the return should not be the Anded result but the Ored result

Return $tr Or $tb Or $tg

Func IsColorMatch($color1, $color2, $threshMax, $threshMin = 0)
    If $threshMin = 0 And color1 <> $color2 Then Return False
    $threshMin = Abs($threshMin)
    $r1 = _ColorGetRed($color1)
    $g1 = _ColorGetGreen($color1)
    $b1 = _ColorGetBlue($color1)
    $r2 = _ColorGetRed($color2)
    $g2 = _ColorGetGreen($color2)
    $b2 = _ColorGetBlue($color2)
    $dr = Abs($r1 - $r2)
    $dg = Abs($g1 - $g2)
    $db = Abs($b1 - $b2)
    $tr = $dr > $threshMin
    $tg = $dg > $threshMin
    $tb = $db > $threshMin
    Return $tr Or $tg Or $tb
EndFunc   ;==>IsColorMatch