diff --git a/4dev/tests/Convert/CoreLibsConvertColorTest.php b/4dev/tests/Convert/CoreLibsConvertColorTest.php
new file mode 100644
index 00000000..3b5d950f
--- /dev/null
+++ b/4dev/tests/Convert/CoreLibsConvertColorTest.php
@@ -0,0 +1,345 @@
+<?php
+
+declare(strict_types=1);
+
+namespace tests;
+
+use PHPUnit\Framework\TestCase;
+use CoreLibs\Convert\Color;
+
+/**
+ * Test class for Convert\Color\Color
+ * @coversDefaultClass \CoreLibs\Convert\Color\Color
+ * @testdox \CoreLibs\Convert\Color\Color method tests
+ */
+final class CoreLibsConvertColorTest extends TestCase
+{
+	// 12 precision allowed, RGB and back has a lot of float imprecisions here
+	private const DELTA = 0.000000000001;
+
+	// sRGB base convert test, should round around and come out the same
+	// use for RGB 0, 0, 0 in 60 steps and then max 255
+	// for Hxx 0 + 60 until 360 == 0
+	// other values for this depend
+
+	// convert to/from oklab/cielab: just from RGB (or HSL) as pre conversion are all the same
+
+	public static function adjustToIntForRgb(array $values): array
+	{
+		return array_map(
+			fn ($v) => round($v),
+			$values
+		);
+	}
+
+	public function testSingle()
+	{
+		$this->assertTrue(true, 'Single test');
+	// 	$rgb = Color\Coordinates\RGB::__constructFromArray([0, 0, 60]);
+	// 	print "IN: " . print_r($rgb, true) . "\n";
+	// 	$hsl = Color\Color::rgbToHsl($rgb);
+	// 	print "to HSL: " . print_r($hsl, true) . "\n";
+	// 	$hsb = Color\Color::hslToHsb($hsl);
+	// 	print "to HSB: " . print_r($hsb, true) . "\n";
+	// 	$hwb = Color\Color::hsbToHwb($hsb);
+	// 	print "to HWB: " . print_r($hwb, true) . "\n";
+	// 	// and reverse
+	// 	$hsb_r = Color\Color::hwbToHsb($hwb);
+	// 	print "R to HSB: " . print_r($hsb_r, true) . "\n";
+	// 	$hsl_r = Color\Color::hsbToHsl($hsb_r);
+	// 	print "R to HSB: " . print_r($hsl_r, true) . "\n";
+	// 	$rgb_r = Color\Color::hslToRgb($hsl_r);
+	// 	print "R to RGB: " . print_r($rgb_r, true) . "\n";
+
+		// $hsl = Color\Coordinates\HSL::__constructFromArray([0, 0, 0]);
+		// print "IN HSL: " . print_r($hsl, true) . "\n";
+		// $hsb = Color\Color::hslToHsb($hsl);
+		// print "to HSB: " . print_r($hsb, true) . "\n";
+		// $hwb = Color\Color::hsbToHwb($hsb);
+		// print "to HWB: " . print_r($hwb, true) . "\n";
+		// // and reverse
+		// $hsb_r = Color\Color::hwbToHsb($hwb);
+		// print "R to HSB: " . print_r($hsb_r, true) . "\n";
+		// $hsl_r = Color\Color::hsbToHsl($hsb_r);
+		// print "R to HSL: " . print_r($hsl_r, true) . "\n";
+		// print "--------\n";
+		// $hsb = Color\Coordinates\HSB::__constructFromArray([0, 20, 0]);
+		// print "IN HSB: " . print_r($hsb, true) . "\n";
+		// $hsl = Color\Color::hsbToHsl($hsb);
+		// print "to HSL: " . print_r($hsl, true) . "\n";
+		// $hwb = Color\Color::hslToHwb($hsl);
+		// print "to HWB: " . print_r($hwb, true) . "\n";
+		// // and reverse
+		// $hsl_r = Color\Color::hwbToHsl($hwb);
+		// print "R to HSB: " . print_r($hsb_r, true) . "\n";
+		// $hsb_r = Color\Color::hslToHsb($hsl_r);
+		// print "R to HSL: " . print_r($hsb_r, true) . "\n";
+		// print "--------\n";
+		// $hwb = Color\Coordinates\HWB::__constructFromArray([0, 20, 100]);
+		// print "IN: " . print_r($hwb, true) . "\n";
+		// $hsl = Color\Color::hwbToHsl($hwb);
+		// print "to HSL: " . print_r($hsl, true) . "\n";
+		// $hwb_r = Color\Color::hslToHwb($hsl);
+		// print "HSL to HWB: " . print_r($hwb_r, true) . "\n";
+		// $hsb = Color\Color::hwbToHsb($hwb);
+		// print "to HSB: " . print_r($hsb, true) . "\n";
+		// $hwb_r = Color\Color::hsbToHwb($hsb);
+		// print "HSL to HWB: " . print_r($hwb_r, true) . "\n";
+	}
+
+	/**
+	 * From/To RGB <-> ... conversion tests
+	 *
+	 * @covers ::rgbToHsb
+	 * @covers ::rgbToHsl
+	 * @covers ::rgbToHwb
+	 * @covers ::hsbToRgb
+	 * @covers ::hslToRgb
+	 * @covers ::hwebToRgb
+	 * @testdox Convert from and to RGB via HSL, HWB, HSB/V
+	 *
+	 * @return void
+	 */
+	public function testRgbColorCoordinateConvertToAndBack(): void
+	{
+		for ($r = 0; $r <= 300; $r += 60) {
+			for ($g = 0; $g <= 300; $g += 60) {
+				for ($b = 0; $b <= 300; $b += 60) {
+					// for this test we stay in the correct lane
+					if ($r > 255) {
+						$r = 255;
+					}
+					if ($g > 255) {
+						$g = 255;
+					}
+					if ($b > 255) {
+						$b = 255;
+					}
+					// base is always the same
+					$color = Color\Coordinates\RGB::__constructFromArray([$r, $g, $b]);
+					$base = 'rgb';
+					foreach (['hsb', 'hsl', 'hwb'] as $coord) {
+						// print "COORD: " . $coord . ", RGB: " . print_r($color->returnAsArray(), true) . "\n";
+						// rgb to X and back must be same
+						$target = $base . 'To' . ucfirst($coord);
+						$source = $coord . 'To' . ucfirst($base);
+						$converted_color = Color\Color::$target($color);
+						$color_b = Color\Color::$source($converted_color);
+						// $converted_color = Color\Color::rgbToHsb($color);
+						// $rgb_b = Color\Color::hsbToRgb($converted_color);
+						$this->assertEqualsWithDelta(
+							$color->returnAsArray(),
+							$color_b->returnAsArray(),
+							self::DELTA,
+							'Convert ' . $base . ' to ' . $coord . ': ' . print_r($color->returnAsArray(), true) . '/'
+								. print_r($color_b->returnAsArray(), true)
+						);
+					}
+				}
+			}
+		}
+	}
+
+	// HSL / HSB / HWB conversion are not reversable if
+	// HSL: lightness 0 or 100
+	// HSB: saturation or brightness 0
+	// HWB: blackness >= 80 and whitness >= 20 or B>=20 & W>=20 or B>=50 & W>=50
+
+	/**
+	 * Undocumented function
+	 *
+	 * @covers ::hslToHsb
+	 * @covers ::hsbToHsl
+	 * @covers ::hslToHwb
+	 * @covers ::hwbToHsl
+	 * @testdox Convert from and to HSL via RGB, HWB, HSB/V
+	 *
+	 * @return void
+	 */
+	public function testHslColorCoordinateConvertToAndBack(): void
+	{
+		for ($H = 0; $H <= 360; $H += 60) {
+			for ($S = 0; $S <= 100; $S += 20) {
+				for ($L = 0; $L <= 100; $L += 20) {
+					// if lightness 0 or 100 then we cannot reverse (B/W)
+					if (($L == 0 or $L == 100)) {
+						continue;
+					}
+					$color = Color\Coordinates\HSL::__constructFromArray([$H, $S, $L]);
+					$base = 'hsl';
+					foreach (['hsb', 'hwb', 'rgb'] as $coord) {
+						// for rgb hue on S = 0 is irrelevant (B/W)
+						if ($H > 0 && $coord == 'rgb') {
+							continue;
+						}
+						$target = $base . 'To' . ucfirst($coord);
+						$source = $coord . 'To' . ucfirst($base);
+						$converted_color = Color\Color::$target($color);
+						$color_b = Color\Color::$source($converted_color);
+						// print "COORD: " . $coord . ", HSL: " . print_r($color->returnAsArray(), true) . "\n";
+						$this->assertEqualsWithDelta(
+							$color->returnAsArray(),
+							$color_b->returnAsArray(),
+							self::DELTA,
+							'Convert HSL to ' . $coord . ': ' . print_r($color->returnAsArray(), true) . '/'
+								. print_r($color_b->returnAsArray(), true)
+						);
+					}
+				}
+			}
+		}
+	}
+
+	/**
+	 * Undocumented function
+	 *
+	 * @covers ::hsbToHsl
+	 * @covers ::hslToHsb
+	 * @covers ::hsbToHwb
+	 * @covers ::hwbToHsb
+	 * @testdox Convert from and to HSB via RGB, HWB, HSL
+	 *
+	 * @return void
+	 */
+	public function testHsbColorCoordinateConvertToAndBack(): void
+	{
+		for ($H = 0; $H <= 360; $H += 60) {
+			for ($S = 0; $S <= 100; $S += 20) {
+				for ($B = 0; $B <= 100; $B += 20) {
+					// if sat or brightness is 0 then we cannot reverse correctly (B/W)
+					if ($S == 0 or $B == 0) {
+						continue;
+					}
+					$color = Color\Coordinates\HSB::__constructFromArray([$H, $S, $B]);
+					$base = 'hsb';
+					foreach (['hwb', 'hsl', 'rgb'] as $coord) {
+						$target = $base . 'To' . ucfirst($coord);
+						$source = $coord . 'To' . ucfirst($base);
+						$converted_color = Color\Color::$target($color);
+						$color_b = Color\Color::$source($converted_color);
+						// print "COORD: " . $coord . ", HSL: " . print_r($color->returnAsArray(), true) . "\n";
+						$this->assertEqualsWithDelta(
+							$color->returnAsArray(),
+							$color_b->returnAsArray(),
+							self::DELTA,
+							'Convert ' . $base . ' to ' . $coord . ': ' . print_r($color->returnAsArray(), true) . '/'
+								. print_r($color_b->returnAsArray(), true)
+						);
+					}
+				}
+			}
+		}
+	}
+
+
+	/**
+	 * Undocumented function
+	 *
+	 * @covers ::hwbToHsl
+	 * @covers ::hslToHwb
+	 * @covers ::hwbToHsb
+	 * @covers ::hsbToHwb
+	 * @testdox Convert from and to HWB via RGB, HSL, HSB/V
+	 *
+	 * @return void
+	 */
+	public function testHwbColorCoordinateConvertToAndBack(): void
+	{
+		for ($H = 0; $H <= 360; $H += 60) {
+			for ($W = 0; $W <= 100; $W += 20) {
+				for ($B = 0; $B <= 100; $B += 20) {
+					// if W>=20 and B>=80 or B>=20 and W>=20 or both >=50
+					// we cannot reverse correctl (B/W)
+					if (
+						($W >= 20 && $B >= 80) ||
+						($W >= 80 && $B >= 20) ||
+						($W >= 50 && $B >= 50)
+					) {
+						continue;
+					}
+					$base = 'hwb';
+					$color = Color\Coordinates\HWB::__constructFromArray([$H, $W, $B]);
+					foreach (['hsl', 'hsb', 'rgb'] as $coord) {
+						// for rgb hue on S = 0 is irrelevant (B/W)
+						if ($H > 0 && $coord == 'rgb') {
+							continue;
+						}
+						$target = $base . 'To' . ucfirst($coord);
+						$source = $coord . 'To' . ucfirst($base);
+						$converted_color = Color\Color::$target($color);
+						$color_b = Color\Color::$source($converted_color);
+						// print "COORD: " . $coord . ", HSL: " . print_r($color->returnAsArray(), true) . "\n";
+						$this->assertEqualsWithDelta(
+							$color->returnAsArray(),
+							$color_b->returnAsArray(),
+							self::DELTA,
+							'Convert ' . $base . ' to ' . $coord . ': ' . print_r($color->returnAsArray(), true) . '/'
+								. print_r($color_b->returnAsArray(), true)
+						);
+					}
+				}
+			}
+		}
+	}
+
+	/**
+	 * Undocumented function
+	 *
+	 * covers ::returnAsHex()
+	 * covers ::__constructFromHexString()
+	 * @testdox Convert from RGB to hex and back
+	 *
+	 * @return void
+	 */
+	public function testRgbToFromHex(): void
+	{
+		for ($r = 0; $r <= 300; $r += 60) {
+			for ($g = 0; $g <= 300; $g += 60) {
+				for ($b = 0; $b <= 300; $b += 60) {
+					// for this test we stay in the correct lane
+					if ($r > 255) {
+						$r = 255;
+					}
+					if ($g > 255) {
+						$g = 255;
+					}
+					if ($b > 255) {
+						$b = 255;
+					}
+					// with or without prefix
+					foreach ([true, false] as $hex_prefix) {
+						$hex_color = Color\Coordinates\RGB::__constructFromArray([$r, $g, $b])
+							->returnAsHex($hex_prefix);
+						// parse into hex to rgb and see if we get the same r/g/b
+						$color = Color\Coordinates\RGB::__constructFromHexString($hex_color)->returnAsArray();
+						//
+						$this->assertEquals(
+							[$r, $g, $b],
+							$color,
+							'Convert rgb to hex and back: ' . print_r([$r, $g, $b], true) . '/'
+								. print_r($color, true)
+						);
+					}
+				}
+			}
+		}
+	}
+
+	// oklab
+
+	// cie lab
+
+	// create exceptions for all color spaces
+
+	public function testExceptionHSB(): void
+	{
+		// for H/S/B exception the same
+		$this->expectException(\LengthException::class);
+		Color\Coordinates\HSB::__constructFromArray([900, 10, 10]);
+
+		// invalid access to class
+		// $this->expectException(\ErrorException::class);
+	}
+}
+
+// __END__
diff --git a/www/admin/class_test.convert.colors.php b/www/admin/class_test.convert.colors.php
index 84d70ce5..131bc642 100644
--- a/www/admin/class_test.convert.colors.php
+++ b/www/admin/class_test.convert.colors.php
@@ -68,8 +68,63 @@ print "<body>";
 print '<div><a href="class_test.php">Class Test Master</a></div>';
 print '<div><h1>' . $PAGE_NAME . '</h1></div>';
 
+// out of bounds test
+
 // define a list of from to color sets for conversion test
 
+$hwb = Color::hsbToHwb(Coordinates\HSB::__constructFromArray([
+	160,
+	0,
+	50,
+]));
+print "HWB: " . DgS::printAr($hwb) . "<br>";
+$hsb = Color::hwbToHsb($hwb);
+print "HSB: " . DgS::printAr($hsb) . "<br>";
+
+$oklch = Color::rgbToOkLch(Coordinates\RGB::__constructFromArray([
+	250,
+	0,
+	0
+]));
+print "OkLch: " . DgS::printAr($oklch) . "<br>";
+$rgb = Color::okLchToRgb($oklch);
+print "OkLch -> RGB: " . DgS::printAr($rgb) . "<br>";
+
+$oklab = Color::rgbToOkLab(Coordinates\RGB::__constructFromArray([
+	250,
+	0,
+	0
+]));
+print "OkLab: " . DgS::printAr($oklab) . "<br>";
+print display($oklab->toCssString(), $oklab->toCssString(), 'Oklab');
+$rgb = Color::okLabToRgb($oklab);
+print "OkLab -> RGB: " . DgS::printAr($rgb) . "<br>";
+print display($rgb->toCssString(), $rgb->toCssString(), 'OkLab to RGB');
+
+$rgb = Coordinates\RGB::__constructFromArray([250, 100, 10])->toLinear();
+print "RGBlinear: " . DgS::printAr($rgb) . "<br>";
+$rgb = Coordinates\RGB::__constructFromArray([0, 0, 0])->toLinear();
+print "RGBlinear: " . DgS::printAr($rgb) . "<br>";
+
+$cie_lab = Color::okLabToLab($oklab);
+print "CieLab: " . DgS::printAr($cie_lab) . "<br>";
+print display($cie_lab->toCssString(), $cie_lab->toCssString(), 'OkLab to Cie Lab');
+
+$rgb = Coordinates\RGB::__constructFromArray([0, 0, 60]);
+$hsb = Color::rgbToHsb($rgb);
+$rgb_b = Color::hsbToRgb($hsb);
+print "RGB: " . DgS::printAr($rgb) . "<br>";
+print "RGB->HSB: " . DgS::printAr($hsb) . "<br>";
+print "HSB->RGB: " . DgS::printAr($rgb_b) . "<br>";
+
+$hsl = Coordinates\HSL::__constructFromArray([0, 20, 0]);
+$hsb = Coordinates\HSB::__constructFromArray([0, 20, 0]);
+$hsl_from_hsb = Color::hsbToHsl($hsb);
+print "HSL from HSB: " . DgS::printAr($hsl_from_hsb) . "<br>";
+
+print "<hr>";
+print "<h2>LEGACY</h2>";
+
 // A(out of bounds)
 try {
 	print "C::S/COLOR invalid rgb->hex (gray 125): -1, -1, -1: "
@@ -83,6 +138,7 @@ try {
 } catch (\LengthException $e) {
 	print "**Exception: " . $e->getMessage() . "<br><pre>" . print_r($e, true) . "</pre><br>";
 }
+print "<hr>";
 // B(valid)
 $rgb = [50, 20, 30];
 $hex = '#0a141e';
@@ -125,6 +181,8 @@ print "S::COLOR hsb->rgb: $hsb[0], $hsb[1], $hsb[2]: "
 		Colors::hsb2rgb($hsb[0], $hsb[1], $hsb[2])
 	)) . "<br>";
 
+print "<hr>";
+
 // Random text
 $h = rand(0, 359);
 $s = rand(15, 70);
@@ -134,49 +192,12 @@ print "RANDOM IN: H: " . $h . ", S: " . $s . ", B/L: " . $b . "/" . $l . "<br>";
 print "RANDOM hsb->rgb: <pre>" . DgS::printAr(SetVarType::setArray(Colors::hsb2rgb($h, $s, $b))) . "</pre><br>";
 print "RANDOM hsl->rgb: <pre>" . DgS::printAr(SetVarType::setArray(Colors::hsl2rgb($h, $s, $l))) . "</pre><br>";
 
+print "<hr>";
+
 $rgb = [0, 0, 0];
 print "rgb 0,0,0: " . Dgs::printAr($rgb) . " => " . Dgs::printAr(Colors::rgb2hsb($rgb[0], $rgb[1], $rgb[2])) . "<br>";
 
-// TODO: run compare check input must match output
-
-$hwb = Color::hsbToHwb(Coordinates\HSB::__constructFromArray([
-	160,
-	0,
-	50,
-]));
-print "HWB: " . DgS::printAr($hwb) . "<br>";
-$hsb = Color::hwbToHsb($hwb);
-print "HSB: " . DgS::printAr($hsb) . "<br>";
-
-$oklch = Color::rgbToOkLch(Coordinates\RGB::__constructFromArray([
-	250,
-	0,
-	0
-]));
-print "OkLch: " . DgS::printAr($oklch) . "<br>";
-$rgb = Color::okLchToRgb($oklch);
-print "OkLch -> RGB: " . DgS::printAr($rgb) . "<br>";
-
-$oklab = Color::rgbToOkLab(Coordinates\RGB::__constructFromArray([
-	250,
-	0,
-	0
-]));
-print "OkLab: " . DgS::printAr($oklab) . "<br>";
-print display($oklab->toCssString(), $oklab->toCssString(), 'Oklab');
-$rgb = Color::okLabToRgb($oklab);
-print "OkLab -> RGB: " . DgS::printAr($rgb) . "<br>";
-print display($rgb->toCssString(), $rgb->toCssString(), 'OkLab to RGB');
-
-$rgb = Coordinates\RGB::__constructFromArray([250, 100, 10])->toLinear();
-print "RGBlinear: " . DgS::printAr($rgb) . "<br>";
-$rgb = Coordinates\RGB::__constructFromArray([0, 0, 0])->toLinear();
-print "RGBlinear: " . DgS::printAr($rgb) . "<br>";
-
-$cie_lab = Color::okLabToLab($oklab);
-print "CieLab: " . DgS::printAr($cie_lab) . "<br>";
-print display($cie_lab->toCssString(), $cie_lab->toCssString(), 'OkLab to Cie Lab');
-
+print "<hr>";
 
 print "</body></html>";
 
diff --git a/www/lib/CoreLibs/Convert/Color/Color.php b/www/lib/CoreLibs/Convert/Color/Color.php
index 3b490e9b..49e6bd96 100644
--- a/www/lib/CoreLibs/Convert/Color/Color.php
+++ b/www/lib/CoreLibs/Convert/Color/Color.php
@@ -354,15 +354,21 @@ class Color
 	{
 		$saturation = $hsl->S / 100;
 		$lightness = $hsl->L / 100;
-		$value  = $lightness + $saturation * min($lightness, 1 - $lightness);
+		// if lightness is 0, then we cannot return convert to hsb
+		$value = $lightness + $saturation * min($lightness, 1 - $lightness);
+		// print "Orig: " . print_r($hsl, true) . "\n";
+		// print "SAT: " . $saturation . ", Lightness: " . $lightness . ", Value: " . $value . "\n";
+		// var_dump($value);
+
 		// check for black and white
-		$saturation = ($value === 0) ?
+		$saturation = $value == 0 ?
 			0 :
 			200 * (1 - $lightness / $value);
+		$value *= 100;
 		return HSB::__constructFromArray([
 			$hsl->H,
 			$saturation,
-			$value * 100,
+			$value,
 		]);
 	}
 
@@ -377,11 +383,11 @@ class Color
 		// hsv/toHsl
 		$hue = $hsb->H;
 		$saturation = $hsb->S / 100;
-		$value = $hsb->V / 100;
+		$value = $hsb->B / 100;
 
 		$lightness = $value * (1 - $saturation / 2);
 		// check for B/W
-		$saturation = in_array($lightness, [0, 1], true) ?
+		$saturation = in_array($lightness, [0, 1]) ?
 			0 :
 			100 * ($value - $lightness) / min($lightness, 1 - $lightness)
 		;
@@ -456,6 +462,7 @@ class Color
 		$blackness = $hwb->B / 100;
 
 		$sum = $whiteness + $blackness;
+		// print "S: B/W: " . $sum . " /W: " . $whiteness . " /B: " . $blackness . "\n";
 		// for black and white
 		if ($sum >= 1) {
 			$saturation = 0;
@@ -475,8 +482,6 @@ class Color
 
 	// MARK: LAB <-> LCH
 
-	// toLch
-
 	/**
 	 * CIE Lab to LCH
 	 *
diff --git a/www/lib/CoreLibs/Convert/Color/Coordinates/HSB.php b/www/lib/CoreLibs/Convert/Color/Coordinates/HSB.php
index 7ebb2dc6..40a74dab 100644
--- a/www/lib/CoreLibs/Convert/Color/Coordinates/HSB.php
+++ b/www/lib/CoreLibs/Convert/Color/Coordinates/HSB.php
@@ -62,10 +62,10 @@ class HSB
 		}
 		switch ($name) {
 			case 'H':
-				if ($value == 360) {
+				if ((int)$value == 360) {
 					$value = 0;
 				}
-				if ($value < 0 || $value > 359) {
+				if ((int)$value < 0 || (int)$value > 359) {
 					throw new \LengthException(
 						'Argument value ' . $value . ' for hue is not in the range of 0 to 359',
 						1
@@ -73,7 +73,7 @@ class HSB
 				}
 				break;
 			case 'S':
-				if ($value < 0 || $value > 100) {
+				if ((int)$value < 0 || (int)$value > 100) {
 					throw new \LengthException(
 						'Argument value ' . $value . ' for saturation is not in the range of 0 to 100',
 						2
@@ -81,7 +81,7 @@ class HSB
 				}
 				break;
 			case 'B':
-				if ($value < 0 || $value > 100) {
+				if ((int)$value < 0 || (int)$value > 100) {
 					throw new \LengthException(
 						'Argument value ' . $value . ' for brightness is not in the range of 0 to 100',
 						3
diff --git a/www/lib/CoreLibs/Convert/Color/Coordinates/HSL.php b/www/lib/CoreLibs/Convert/Color/Coordinates/HSL.php
index 15005471..1b5b4ecc 100644
--- a/www/lib/CoreLibs/Convert/Color/Coordinates/HSL.php
+++ b/www/lib/CoreLibs/Convert/Color/Coordinates/HSL.php
@@ -63,10 +63,10 @@ class HSL
 		}
 		switch ($name) {
 			case 'H':
-				if ($value == 360) {
+				if ((int)$value == 360) {
 					$value = 0;
 				}
-				if ($value < 0 || $value > 359) {
+				if ((int)$value < 0 || (int)$value > 359) {
 					throw new \LengthException(
 						'Argument value ' . $value . ' for hue is not in the range of 0 to 359',
 						1
@@ -74,7 +74,7 @@ class HSL
 				}
 				break;
 			case 'S':
-				if ($value < 0 || $value > 100) {
+				if ((int)$value < 0 || (int)$value > 100) {
 					throw new \LengthException(
 						'Argument value ' . $value . ' for saturation is not in the range of 0 to 100',
 						2
@@ -82,7 +82,7 @@ class HSL
 				}
 				break;
 			case 'L':
-				if ($value < 0 || $value > 100) {
+				if ((int)$value < 0 || (int)$value > 100) {
 					throw new \LengthException(
 						'Argument value ' . $value . ' for luminance is not in the range of 0 to 100',
 						3
diff --git a/www/lib/CoreLibs/Convert/Color/Coordinates/HWB.php b/www/lib/CoreLibs/Convert/Color/Coordinates/HWB.php
index 1dd6eb23..39999f41 100644
--- a/www/lib/CoreLibs/Convert/Color/Coordinates/HWB.php
+++ b/www/lib/CoreLibs/Convert/Color/Coordinates/HWB.php
@@ -63,10 +63,10 @@ class HWB
 		}
 		switch ($name) {
 			case 'H':
-				if ($value == 360) {
+				if ((int)$value == 360) {
 					$value = 0;
 				}
-				if ($value < 0 || $value > 360) {
+				if ((int)$value < 0 || (int)$value > 360) {
 					throw new \LengthException(
 						'Argument value ' . $value . ' for hue is not in the range of 0 to 360',
 						1
@@ -74,7 +74,7 @@ class HWB
 				}
 				break;
 			case 'W':
-				if ($value < 0 || $value > 100) {
+				if ((int)$value < 0 || (int)$value > 100) {
 					throw new \LengthException(
 						'Argument value ' . $value . ' for saturation is not in the range of 0 to 100',
 						2
@@ -82,7 +82,7 @@ class HWB
 				}
 				break;
 			case 'B':
-				if ($value < 0 || $value > 100) {
+				if ((int)$value < 0 || (int)$value > 100) {
 					throw new \LengthException(
 						'Argument value ' . $value . ' for luminance is not in the range of 0 to 100',
 						3
diff --git a/www/lib/CoreLibs/Convert/Color/Coordinates/RGB.php b/www/lib/CoreLibs/Convert/Color/Coordinates/RGB.php
index 7fc3eda0..17dbeb6c 100644
--- a/www/lib/CoreLibs/Convert/Color/Coordinates/RGB.php
+++ b/www/lib/CoreLibs/Convert/Color/Coordinates/RGB.php
@@ -85,11 +85,10 @@ class RGB
 			throw new \ErrorException('Creation of dynamic property is not allowed', 0);
 		}
 		// if not linear
-		if (!$this->linear && ($value < 0 || $value > 255)) {
+		if (!$this->linear && ((int)$value < 0 || (int)$value > 255)) {
 			throw new \LengthException('Argument value ' . $value . ' for color ' . $name
 				. ' is not in the range of 0 to 255', 1);
-		} elseif ($this->linear && ($value < -10E10 || $value > 1)) {
-			// not allow very very small negative numbers
+		} elseif ($this->linear && ((int)$value < 0 || (int)$value > 1)) {
 			throw new \LengthException('Argument value ' . $value . ' for color ' . $name
 				. ' is not in the range of 0 to 1 for linear rgb', 1);
 		}