161 	public function Brightness(&$gdimg, $amount=0) {  argument
162 		if ($amount == 0) {
165 		$amount = max(-255, min(255, $amount));
168 			if (imagefilter($gdimg, IMG_FILTER_BRIGHTNESS, $amount)) {
171 …$this->DebugMessage('FAILED: imagefilter($gdimg, IMG_FILTER_BRIGHTNESS, '.$amount.')', __FILE__, _…
175 		$scaling = (255 - abs($amount)) / 255;
176 		$baseamount = (($amount > 0) ? $amount : 0);
192 	public function Contrast(&$gdimg, $amount=0) {  argument
193 		if ($amount == 0) {
196 		$amount = max(-255, min(255, $amount));
200 			$amount = ($amount / 255) * -100;
201 			if (imagefilter($gdimg, IMG_FILTER_CONTRAST, $amount)) {
204 …$this->DebugMessage('FAILED: imagefilter($gdimg, IMG_FILTER_CONTRAST, '.$amount.')', __FILE__, __L…
208 		if ($amount > 0) {
209 			$scaling = 1 + ($amount / 255);
211 			$scaling = (255 - abs($amount)) / 255;
228 	public function Colorize(&$gdimg, $amount, $targetColor) {  argument
229 		$amount      = (is_numeric($amount)                          ? $amount      : 25);
230 		$amountPct   = $amount / 100;
233 		if ($amount == 0) {
267 …$NewPixel[$key] = round(max(0, min(255, ($OriginalPixel[$key] * ((100 - $amount) / 100)) + ($Targe…
306 	public function Desaturate(&$gdimg, $amount, $color='') {  argument
307 		if ($amount == 0) {
310 …return $this->Colorize($gdimg, $amount, (phpthumb_functions::IsHexColor($color) ? $color : 'gray')…
507 	public function Gamma(&$gdimg, $amount) {  argument
508 		if (number_format($amount, 4) == '1.0000') {
511 		return imagegammacorrect($gdimg, 1.0, $amount);
921 	public function Saturation(&$gdimg, $amount, $color='') {  argument
922 		if ($amount == 0) {
924 		} elseif ($amount > 0) {
925 			$amount = 0 - $amount;
927 			$amount = abs($amount);
929 		return $this->Desaturate($gdimg, $amount, $color);
933 	public function Sepia(&$gdimg, $amount, $targetColor) {  argument
934 		$amount      = (is_numeric($amount) ? max(0, min(100, $amount)) : 50);
935 		$amountPct   = $amount / 100;
938 		if ($amount == 0) {
990 	public function Smooth(&$gdimg, $amount=6) {  argument
991 		$amount = min(25, max(0, $amount));
992 		if ($amount == 0) {
996 			if (imagefilter($gdimg, IMG_FILTER_SMOOTH, $amount)) {
999 …$this->DebugMessage('FAILED: imagefilter($gdimg, IMG_FILTER_SMOOTH, '.$amount.')', __FILE__, __LIN…
1003 …$this->DebugMessage('FAILED: phpthumb_filters::Smooth($gdimg, '.$amount.') [function not implement…