Quick 'n dirty script which increases color brightness (e.g. by 15%) for a given set of colors using the HSV (a.k.a HSB) color space.
I used this to generate bright variants of the atom One Dark syntax color scheme
for my Xresources.
name | hex | rgb | hsl | hsv
--------------+---------+--------------------+--------------------+--------------------
black_normal | #282C34 | rgb(40, 44, 52) | hsl(220, 13%, 18%) | hsv(220, 23%, 20%)
black_bright | #454C59 | rgb(69, 76, 89) | hsl(220, 13%, 31%) | hsv(220, 23%, 35%)
red_normal | #E06C75 | rgb(224, 108, 117) | hsl(355, 65%, 65%) | hsv(355, 52%, 88%)
red_bright | #FF7A85 | rgb(255, 122, 133) | hsl(355, 100%, 74%)| hsv(355, 52%, 100%)
green_normal | #98C379 | rgb(152, 195, 121) | hsl(95, 38%, 62%) | hsv(95, 38%, 76%)
green_bright | #B5E890 | rgb(181, 232, 144) | hsl(95, 66%, 74%) | hsv(95, 38%, 91%)
yellow_normal | #E5C07B | rgb(229, 192, 123) | hsl(39, 67%, 69%) | hsv(39, 46%, 90%)
yellow_bright | #FFD68A | rgb(255, 214, 138) | hsl(39, 100%, 77%) | hsv(39, 46%, 100%)
blue_normal | #61AFEF | rgb(97, 175, 239) | hsl(207, 82%, 66%) | hsv(207, 59%, 94%)
blue_bright | #69BBFF | rgb(105, 187, 255) | hsl(207, 100%, 71%)| hsv(207, 59%, 100%)
magenta_normal| #C678DD | rgb(198, 120, 221) | hsl(286, 60%, 67%) | hsv(286, 46%, 87%)
magenta_bright| #E48AFF | rgb(228, 138, 255) | hsl(286, 100%, 77%)| hsv(286, 46%, 100%)
cyan_normal | #56B6C2 | rgb(86, 182, 194) | hsl(187, 47%, 55%) | hsv(187, 56%, 76%)
cyan_bright | #66D9E8 | rgb(102, 217, 232) | hsl(187, 74%, 66%) | hsv(187, 56%, 91%)
white_normal | #ABB2BF | rgb(171, 178, 191) | hsl(219, 14%, 71%) | hsv(219, 10%, 75%)
white_bright | #CFD7E6 | rgb(207, 215, 230) | hsl(219, 31%, 86%) | hsv(219, 10%, 90%)
#282C34 #98C379 #E5C07B #61AFEF #C678DD #56B6C2 #ABB2BF
#3E4451 #E05252 #43D08A #E0C285 #528BFF #C678DD #56B6C2 #D8DEE9
#D19A66 #33A0FF
#BE5046 #73c990 #e2c08d
#3E4451 #5C6370 #636D83 #828997