bigevilbrain com // --------------- // Color Functions // --------------- function hsv_to_rgb( $hue, $saturation, $brightness ) { // Convert HSV to RGB values // // $hue = 0.0 to 360.0 // $saturation = 0.0 to 100.0 // $brightness = 0.0 to 100.0 // // HSV to RGB $r = 0; $g = 0; $b = 0; $degree_hue = $hue; // Do $hue Calcutaion if ( $degree_hue<=60 ) { $r = 255; $g = round( 255 * ( $degree_hue / 60 ) ); } else if ( $degree_hue<=120 ) { $r = round( 255 * ( ( ( 120 - $degree_hue ) / 60 ) ) ); $g = 255; } else if ( $degree_hue<=180 ) { $g = 255; $b = round( 255 * ( 1 - ( ( 180 - $degree_hue ) / 60 ) ) ); } else if ( $degree_hue<=240 ) { $g = round( 255 * ( ( ( 240 - $degree_hue ) / 60 ) ) ); $b = 255; } else if ( $degree_hue<=300 ) { $r = round( 255 * ( 1 - ( ( 300 - $degree_hue ) / 60 ) ) ); $b = 255; } else if ( $degree_hue<=360 ) { $r = 255; $b = round( 255 * ( ( ( 360 - $degree_hue ) / 60 ) ) ); } // $r += ( 255 - $r ) * ( 1 - ( $saturation / 100 ) ); $g += ( 255 - $g ) * ( 1 - ( $saturation / 100 ) ); $b += ( 255 - $b ) * ( 1 - ( $saturation / 100 ) ); // $r *= ( $brightness / 100 ); $g *= ( $brightness / 100 ); $b *= ( $brightness / 100 ); // $r = round( $r ); $g = round( $g ); $b = round( $b ); // return Array( $r, $g, $b ); } function rgb_to_hsv( $r, $g, $b ) { // Convert RGB to HSV values // // $r = 0 to 255 // $g = 0 to 255 // $b = 0 to 255 // // // Figure Out $saturation and $brightness $min_val = min( min( $r, $g ), $b ); $max_val = max( max( $r, $g ), $b ); if ( $max_val == 0 ) { $s = 0; } else { $s = ( $max_val - $min_val ) / $max_val; } $v = $max_val / 255; // Default Values $h = 0; // $nr = $brightness; // $ng = $brightness; // $nb = $brightness; // Figure out $hue if ( ( $max_val - $min_val ) != 0 ) { // Normalized Values $nr = ( $r - $min_val ) / ( $max_val - $min_val ); $ng = ( $g - $min_val ) / ( $max_val - $min_val ); $nb = ( $b - $min_val ) / ( $max_val - $min_val ); if ( $nb == 0 ) { // Red & Green if ( $nr == 1 ) { // 0 - - > 60 $h = round( 60 * $ng ); } else { // 60 - - > 120 $h = round( 120 - ( 60 * $nr ) ); } } else if ( $nr == 0 ) { // Blue & Green if ( $ng == 1 ) { // 120 - - > 180 $h = round( ( 60 * $nb ) + 120 ); } else { // 180 - - > 240 $nb == 1 $h = round( 240 - ( 60 * $ng ) ); } } else if ( $ng == 0 ) { // Red & Blue if ( $nb == 1 ) { // 240 - - > 300 $h = round( ( 60 * $nr ) + 240 ); } else { // 300 - - > 360 $nb == 1 $h = round( 360 - ( 60 * $nb ) ); } } } return Array( $h, $s, $v, $nr, $ng, $nb ); } function HexToDec( $hex_value ) { $r = hexdec( substr( $hex_value, 0, 2 ) ); $g = hexdec( substr( $hex_value, 2, 2 ) ); $b = hexdec( substr( $hex_value, 4, 2 ) ); return Array( $r, $g, $b ); } function DecToHex( $colorArr ) { $r = dechex( $colorArr[0] ); $g = dechex( $colorArr[1] ); $b = dechex( $colorArr[2] ); if ( strlen($r) == 1 ) { $r = '0' . $r; } if ( strlen($g) == 1 ) { $g = '0' . $g; } if ( strlen($b) == 1 ) { $b = '0' . $b; } return( $r . $g . $b ); } ?>