LIFX Developer Zone

Having Trouble Finding a Good Resource To Convert Between RGB and HSVK

#1

I’m using the Python LANLifx library for a project and I’m working on and I’m trying to find resources to understand how the HSVK values work. I guess what I’m really asking is for a good resource to understand representing Hue on a level of 0-65k. I see some other topics on this forum about this question but really am curious on how it works not just how to convert.

If I look on this site (and many others),
http://colorizer.org/
I see Hue represented on a scale of degrees to 360. I’m curious of how we get from this 0-360 to the much greater level, and how it factors in with the current libraries out there. Just out of putting random values in there I get
current_bulb.set_color( [5000, 65535, 65535, 3500]) # Red
current_bulb.set_color( [20000, 65535, 65535, 3500]) # Green

        current_bulb.set_color(	[10000, 65535, 65535, 3500]) # Yellow

I’m coming from an RGB world so just getting pointed in the right direction would be really helpful!
Cheers!

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#2

Hi,

In the case of our HSBK, the conversion is

hue = lifxhue / 65535 * 360
saturation = lifxsaturation / 65535
brightness = lifxbrightness / 65535
kelvin = lifxkelvin
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#3

Hi @delfick thanks for the reply. Where would you get those values from though. If HSB is on a value from 0-360 and we need a integer value why would we need to divide by 65535 and multiply by 360. If I have a hue of
250 I would put it into the formula of
250 / 65535 * 360 = 1.3,

which isn’t on the scale of 0 - 65535. So I’m still a bit confused. Thanks for the help.

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#4

So for example, if you ask the bulb for a GetColor then you’ll get back the following in the payload:

hue         : 10922
saturation  : 65535
brightness  : 19660
kelvin      : 3500

Which corresponds to a hsbk value of

hue         : 60
saturation  : 1
brightness  : 0.3
kelvin      : 3500
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