rgb2hsl - Something fun I wrote today about pure-bash-bible HOT 3 OPEN

On Tue, Oct 1, 2019 at 8:12 AM dylan ***@***.***> wrote: This is very likely not perfect but it seems to pass any RGB color I throw at it. # rgb2hsl - usage: rgb2hsl r g b rgb_to_hsl() { local r g b local h s l local min max # Ensure input is greater than 0. ((r=r < 0 ? 0 : ${1:-0})) ((g=g < 0 ? 0 : ${2:-0})) ((b=b < 0 ? 0 : ${3:-0})) # Ensure input is lesser than 255. ((r=r > 255 ? 255 : r)) ((g=g > 255 ? 255 : g)) ((b=b > 255 ? 255 : b)) # Convert RGB value to a 0-100 range. # # This is usually a 0-1 range but we # multiply by 100 to "fake" floating # point. ((r=r * 100 / 255)) ((g=g * 100 / 255)) ((b=b * 100 / 255)) # Give the min variable the maximum # possible value. We must set it to # something. ((min=255)) # Find the minimum and maximum RGB # values for use below. ((min=r < min ? r : min)) ((max=r > max ? r : max)) ((min=g < min ? g : min)) ((max=g > max ? g : max)) ((min=b < min ? b : min)) ((max=b > max ? b : max)) # Calculate the luminace using the # above values. ((l=(min + max) / 2)) # Calculate the saturation using a # different formula based on its # value. # # Again, we multiply the values by # 100 to "fake" floating points. ((s=min == max ? 0 : l < 50 ? (max - min) * 100 / (max + min) : (max - min) * 100 / (200 - max - min) )) # Calculate the hue based on which # RGB value is the maximum. ((h=s == 0 ? 0 : r == max ? (g - b) * 100 / (max - min) : g == max ? 200 + (b - r) * 100 / (max - min) : b == max ? 400 + (r - g) * 100 / (max - min) : 0 )) # Convert the calculation result into # degrees. Divide by 100 to reverse the # floating point hacks. ((h=h * 60 / 100)) printf '%s\n' "$h $s $l" } rgb_to_hsl 18 233 45 — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub, or mute the thread.