ilaj PHP में एचएसवी से आरजीबी




हर्पिस कति पर्कार हुन छ (2)

PHP में, एचएसवी मूल्यों के लिए आरजीबी त्रिपाठी को बदलने का सबसे सीधा तरीका क्या है?


यहां एक सरल, सरल पद्धति है जो एचएसवी मान को डिग्री और प्रतिशत के रूप में देता है, जो कि फ़ोटोशॉप का रंग पिकर का उपयोग करता है।

ध्यान दें कि रिटर्न वैल्यू गोल नहीं है, यदि आप आवश्यक हैं तो आप खुद कर सकते हैं ध्यान रखें कि H(360) == H(0) , इसलिए H 359.5 के 359.5 और अधिक से अधिक 0 तक होनी चाहिए

सीखने के उद्देश्यों के लिए भारी दस्तावेज।

/**
 * Licensed under the terms of the BSD License.
 * (Basically, this means you can do whatever you like with it,
 *   but if you just copy and paste my code into your app, you
 *   should give me a shout-out/credit :)
 */

<?php

function RGBtoHSV($R, $G, $B)    // RGB values:    0-255, 0-255, 0-255
{                                // HSV values:    0-360, 0-100, 0-100
    // Convert the RGB byte-values to percentages
    $R = ($R / 255);
    $G = ($G / 255);
    $B = ($B / 255);

    // Calculate a few basic values, the maximum value of R,G,B, the
    //   minimum value, and the difference of the two (chroma).
    $maxRGB = max($R, $G, $B);
    $minRGB = min($R, $G, $B);
    $chroma = $maxRGB - $minRGB;

    // Value (also called Brightness) is the easiest component to calculate,
    //   and is simply the highest value among the R,G,B components.
    // We multiply by 100 to turn the decimal into a readable percent value.
    $computedV = 100 * $maxRGB;

    // Special case if hueless (equal parts RGB make black, white, or grays)
    // Note that Hue is technically undefined when chroma is zero, as
    //   attempting to calculate it would cause division by zero (see
    //   below), so most applications simply substitute a Hue of zero.
    // Saturation will always be zero in this case, see below for details.
    if ($chroma == 0)
        return array(0, 0, $computedV);

    // Saturation is also simple to compute, and is simply the chroma
    //   over the Value (or Brightness)
    // Again, multiplied by 100 to get a percentage.
    $computedS = 100 * ($chroma / $maxRGB);

    // Calculate Hue component
    // Hue is calculated on the "chromacity plane", which is represented
    //   as a 2D hexagon, divided into six 60-degree sectors. We calculate
    //   the bisecting angle as a value 0 <= x < 6, that represents which
    //   portion of which sector the line falls on.
    if ($R == $minRGB)
        $h = 3 - (($G - $B) / $chroma);
    elseif ($B == $minRGB)
        $h = 1 - (($R - $G) / $chroma);
    else // $G == $minRGB
        $h = 5 - (($B - $R) / $chroma);

    // After we have the sector position, we multiply it by the size of
    //   each sector's arc (60 degrees) to obtain the angle in degrees.
    $computedH = 60 * $h;

    return array($computedH, $computedS, $computedV);
}

?>

<?php
function RGB_TO_HSV ($R, $G, $B)  // RGB Values:Number 0-255
{                                 // HSV Results:Number 0-1
   $HSL = array();

   $var_R = ($R / 255);
   $var_G = ($G / 255);
   $var_B = ($B / 255);

   $var_Min = min($var_R, $var_G, $var_B);
   $var_Max = max($var_R, $var_G, $var_B);
   $del_Max = $var_Max - $var_Min;

   $V = $var_Max;

   if ($del_Max == 0)
   {
      $H = 0;
      $S = 0;
   }
   else
   {
      $S = $del_Max / $var_Max;

      $del_R = ( ( ( $var_Max - $var_R ) / 6 ) + ( $del_Max / 2 ) ) / $del_Max;
      $del_G = ( ( ( $var_Max - $var_G ) / 6 ) + ( $del_Max / 2 ) ) / $del_Max;
      $del_B = ( ( ( $var_Max - $var_B ) / 6 ) + ( $del_Max / 2 ) ) / $del_Max;

      if      ($var_R == $var_Max) $H = $del_B - $del_G;
      else if ($var_G == $var_Max) $H = ( 1 / 3 ) + $del_R - $del_B;
      else if ($var_B == $var_Max) $H = ( 2 / 3 ) + $del_G - $del_R;

      if ($H<0) $H++;
      if ($H>1) $H--;
   }

   $HSL['H'] = $H;
   $HSL['S'] = $S;
   $HSL['V'] = $V;

   return $HSL;
}




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