Given an RGB value how do I create a tint or shade

Question

Given an RGB value  like 168  0  255  how do I create tints  make it lighter  and shades  make it darker  of the color

User · Answer

I m currently experimenting with canvas and pixels    I m finding this logic works out for me better    Use this to calculate the grey-ness   luma      but with both the existing value and the new  tint  value calculate the difference   I found I did not need to multiply   add to offset the  tint  value  var grey     r   g   b    3      var grey2    new r   new g   new b    3   var dr    grey - grey2   1      var dg    grey - grey2   1     var db    grey - grey2   1     tint r   new r   dr      tint g   new g   dg     tint b   new b   db     or something like that

User · Answer

Among several options for shading and tinting    For shades  multiply each component by 1 4  1 2  3 4  etc   of its previous value  The smaller the factor  the darker the shade  For tints  calculate  255 - previous value   multiply that by 1 4  1 2  3 4  etc   the greater the factor  the lighter the tint   and add that to the previous value  assuming each component is a 8-bit integer     Note that color manipulations  such as tints and other shading  should be done in linear RGB  However  RGB colors specified in documents or encoded in images and video are not likely to be in linear RGB  in which case a so-called inverse transfer function needs to be applied to each of the RGB color s components  This function varies with the RGB color space  For example  in the sRGB color space  which can be assumed if the RGB color space is unknown   this function is roughly equivalent to raising each sRGB color component  ranging from 0 through 1  to a power of 2 2   Note that  linear RGB  is not an RGB color space    See also Violet Giraffe s comment about  gamma correction

User · Answer

Some definitions   A shade is produced by  darkening  a hue or  adding black  A tint is produced by  ligthening  a hue or  adding white    Creating a tint or a shade  Depending on your Color Model  there are different methods to create a darker  shaded  or lighter  tinted  color    RGB    To shade    newR   currentR    1 - shade factor  newG   currentG    1 - shade factor  newB   currentB    1 - shade factor   To tint   newR   currentR    255 - currentR    tint factor newG   currentG    255 - currentG    tint factor newB   currentB    255 - currentB    tint factor  More generally  the color resulting in layering a color RGB currentR currentG currentB  with a color RGBA aR aG aB alpha  is   newR   currentR    aR - currentR    alpha newG   currentG    aG - currentG    alpha newB   currentB    aB - currentB    alpha    where  aR aG aB    black    0 0 0  for shading  and  aR aG aB    white    255 255 255  for tinting HSV or HSB    To shade  lower the Value   Brightness or increase the Saturation To tint  lower the Saturation or increase the Value   Brightness  HSL    To shade  lower the Lightness To tint  increase the Lightness    There exists formulas to convert from one color model to another  As per your initial question  if you are in RGB and want to use the HSV model to shade for example  you can just convert to HSV  do the shading and convert back to RGB  Formula to convert are not trivial but can be found on the internet  Depending on your language  it might also be available as a core function     RGB to HSV color in javascript  Convert RGB value to HSV   Comparing the models   RGB has the advantage of being really simple to implement  but    you can only shade or tint your color relatively you have no idea if your color is already tinted or shaded  HSV or HSB is kind of complex because you need to play with two parameters to get what you want  Saturation  amp  Value   Brightness  HSL is the best from my point of view    supported by CSS3  for webapp  simple and accurate    50  means an unaltered Hue  gt 50  means the Hue is lighter  tint   lt 50  means the Hue is darker  shade   given a color you can determine if it is already tinted or shaded you can tint or shade a color relatively or absolutely  by just replacing the Lightness part        If you want to learn more about this subject  Wiki  Colors Model For more information on what those models are  Wikipedia  HSL and HSV

[colors] Given an RGB value, how do I create a tint (or shade)?

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