public function WhiteBalance(&$gdimg, $targetColor = '') { if (phpthumb_functions::IsHexColor($targetColor)) { $targetPixel = array('red' => hexdec(substr($targetColor, 0, 2)), 'green' => hexdec(substr($targetColor, 2, 2)), 'blue' => hexdec(substr($targetColor, 4, 2))); } else { $Analysis = phpthumb_filters::HistogramAnalysis($gdimg, false); $targetPixel = array('red' => max(array_keys($Analysis['red'])), 'green' => max(array_keys($Analysis['green'])), 'blue' => max(array_keys($Analysis['blue']))); } $grayValue = phpthumb_functions::GrayscaleValue($targetPixel['red'], $targetPixel['green'], $targetPixel['blue']); $scaleR = $grayValue / $targetPixel['red']; $scaleG = $grayValue / $targetPixel['green']; $scaleB = $grayValue / $targetPixel['blue']; for ($x = 0; $x < ImageSX($gdimg); $x++) { for ($y = 0; $y < ImageSY($gdimg); $y++) { $currentPixel = phpthumb_functions::GetPixelColor($gdimg, $x, $y); $newColor = phpthumb_functions::ImageColorAllocateAlphaSafe($gdimg, max(0, min(255, round($currentPixel['red'] * $scaleR))), max(0, min(255, round($currentPixel['green'] * $scaleG))), max(0, min(255, round($currentPixel['blue'] * $scaleB))), $currentPixel['alpha']); ImageSetPixel($gdimg, $x, $y, $newColor); } } return true; }
function GrayscalePixel($OriginalPixel) { $gray = phpthumb_functions::GrayscaleValue($OriginalPixel['red'], $OriginalPixel['green'], $OriginalPixel['blue']); return array('red' => $gray, 'green' => $gray, 'blue' => $gray); }