Coding question: I was using leds[i].nscale8(fade); in a loop to fade leds. I found fadeUsingColor in colorutils.h: “void fadeUsingColor( CRGB* leds, uint16_t numLeds, const CRGB& colormask);” and I tried several syntaxes including leds[i].fadeUsingColor(237, 100, 155), and leds[i].fadeUsingColor(CRGB(redFade, greenFade, blueFade)); but they both say
“‘struct CRGB’ has no member named ‘fadeUsingColor’”. In colorutils the syntax for fadeUsingColor is similar to nscale8 so I’m not sure why it doesn’t work. Actually I don’t know why nscale8 works in the first place according to the function. Can someone enlighten me ? (pardon the pun 
I figured this out, thanks anyway!
Glad you got it sorted out @Stephen_Kramer . Would you like to share the enlightenment here too?
I’m interested too - most of the examples in http://fastled.io/docs/3.1/group___colorutils.html need examples cause is really difficult to figure out the right way of using theese functions
// fadeUsingColor - scale down the brightness of an array of pixels,
// as though it were seen through a transparent
// filter with the specified color.
// For example, if the colormask is
// CRGB( 200, 100, 50)
// then the pixels’ red will be faded to 200/256ths,
// their green to 100/256ths, and their blue to 50/256ths.
// This particular example give a ‘hot fade’ look,
// with white fading to yellow, then red, then black.
// You can also use colormasks like CRGB::Blue to
// zero out the red and green elements, leaving blue
// (largely) the same.
Usage example:
fadeUsingColor( leds, NUM_LEDS, CRGB(200, 100, 50));
(no loop needed)
Can same be used in for loop for fading particular “i” leds instead of whole strip? For ex. leds[i] = …? Or just replace NUM_LEDS with “i” ?
You can do something like
fadeUsingColor( leds + i, 1, CRGB(254, 253, 150));
to manipulate just one single rgb set of leds data.
It took me a while as well to understand this pointer magic…
Or fadeUsingColor( leds+10, 20, CRGB(254, 253, 150)); to manipulate leds from index 9 to 29.
Stefan’s got it right, thanks. Now I have a Knight Rider “Kitt” House. I think I’ll call it the KID - Knight Industries Domicile.