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POconvert hsl to hsb
 

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  1. POconvert hsl to hsb
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    <p>what is the formula to convert HSL to HSB? I could only find code that I could easily port for RGB to HSL. According to <a href="https://stackoverflow.com/questions/3423214/convert-hsb-color-to-hsl">this stack overflow answer</a> I can conver hsb to hsl using this formula: </p> <p>(b - s) / 2</p> <p>but I want to go the other way, and (b+s) * 2 returns significantly different values than photoshop's conversion, for example:</p> <p>?rgbtohsb(100,100,100) s: 0 h: 0 b: 200 whereas photoshop returns 0,0,39</p> <p>here is my code based on the <a href="http://www.easyrgb.com/index.php?X=MATH&amp;H=18#text18" rel="nofollow noreferrer">easyrgb.com</a> website's rgb to hsl code (this is written in Brightscript, a Basic like language for the <a href="http://www.roku.com" rel="nofollow noreferrer">Roku Digital Video Player</a>):</p> <pre><code>function RGBtoHSB(r as integer, g as integer, b as integer) as object hue=0.0 var_R = ( R / 255 ) ?"var_R=";var_r var_G = ( G / 255 ) ?"var_g=";var_g var_B = ( B / 255 ) ?"var_b=";var_b var_Min = min([ var_R, var_G, var_B ]) 'Min. value of RGB ?"var_min=";var_min var_Max = max([ var_R, var_G, var_B ]) 'Max. value of RGB ?"var_max=";var_max del_Max = var_Max - var_Min 'Delta RGB value ?"del_max=";del_max LUM = ( var_Max + var_Min ) / 2 ?"LUM=";LUM if ( del_Max = 0 ) 'This is a gray, no chroma... ?"del_max=0" HUE = 0 'HSL results from 0 to 1 SAT = 0 else 'Chromatic data... ?"del_max";del_max if ( LUM &lt; 0.5 ) then SAT = del_Max / ( var_Max + var_Min ) ?"Lum &lt; 0.5 so SAt=";sat else ?"LUM &gt; 0.5, LUM=";LUM SAT = del_Max / ( 2 - var_Max - var_Min ) ?"SAT=";SAT del_R = ( ( ( var_Max - var_R ) / 6 ) + ( del_Max / 2 ) ) / del_Max ?"del_r=";del_r del_G = ( ( ( var_Max - var_G ) / 6 ) + ( del_Max / 2 ) ) / del_Max ?"del_g=";del_g del_B = ( ( ( var_Max - var_B ) / 6 ) + ( del_Max / 2 ) ) / del_Max ?"del_b=";del_b if var_R = var_Max THEN HUE = del_B - del_G ?"var_r=var_max, so HUE=";hue else if ( var_G = var_Max ) then HUE = ( 1 / 3 ) + del_R - del_B ?"var_g=var_max so HUE=";hue else if ( var_B = var_Max ) then HUE = ( 2 / 3 ) + del_G - del_R ?"var_b=var_max so HUE=";hue end if if ( HUE &lt; 0 ) then HUE = HUE + 1 ?"hue &lt; 0 so hue=";hue end if if ( HUE &gt; 1 ) then HUE = HUE - 1 ?"hue &gt; 1 so hue=";hue end if end if end if ?"sleeping" sleep(5000) bri=0.0 bri=(lum+sat) *2 ?"hue=";HUE;" SAT=";sat;" LUM=";lum;" bri=";bri return {h:int(hue*255),s:int(sat*255),l:int(lum*255),b:int(bri*255)} end function </code></pre>
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