RGB relative dimming from KNX

[alexll]

Pure conversion of this script in to dimming of 3 objects is this but I'm not sure if this is what you need. Most likely you would have to calculate saturation.

Code:

addressbyteoutput1 = '32/1/1'
addressbyteoutput2 = '32/1/2'
addressbyteoutput3 = '32/1/3'

stepsize = 10

value = event.getvalue()

current1 = grp.getvalue(addressbyteoutput1)
current2 = grp.getvalue(addressbyteoutput2)
current3 = grp.getvalue(addressbyteoutput3)
if value < 8 and value ~= 0 then
  log('down',value)
  if current1 <= stepsize then
    output = 0
    if current1 ~= output then
      grp.write(addressbyteoutput1, output)
       end
  else
    output = current1 - stepsize
    if current1 ~= output then
      grp.write(addressbyteoutput1, output)
    end
  end
if current2 <= stepsize then
    output = 0
    if current2 ~= output then
      grp.write(addressbyteoutput2, output)
       end
  else
    output = current2 - stepsize
    if current2 ~= output then
      grp.write(addressbyteoutput2, output)
    end
  end 

if current3 <= stepsize then
    output = 0
    if current3 ~= output then
      grp.write(addressbyteoutput3, output)
       end
  else
    output = current3 - stepsize
    if current3 ~= output then
      grp.write(addressbyteoutput3, output)
    end
  end 
 
 
elseif value > 8 then
  log('up',value)
  if current1 >= (100 - stepsize) then
    output = 100
    if current1 ~= output then
      grp.write(addressbyteoutput1, output)
    end
  else
    output = current1 + stepsize
    if current1 ~= output then
      grp.write(addressbyteoutput1, output)
    end
  end
 


  if current2 >= (100 - stepsize) then
    output = 100
    if current2 ~= output then
      grp.write(addressbyteoutput2, output)
    end
  else
    output = current2 + stepsize
    if current2 ~= output then
      grp.write(addressbyteoutput2, output)
    end
  end
 

  if current3 >= (100 - stepsize) then
    output = 100
    if current3 ~= output then
      grp.write(addressbyteoutput3, output)
    end
  else
    output = current3 + stepsize
    if current3 ~= output then
      grp.write(addressbyteoutput3, output)
    end
  end
end

Thanks for the quick answer. That would work, but like dimming 3 independent lights.

I think the theorical way should be, first, to convert those 3 1byte objects in a 3byte RGB value (232.600). After that, to "dim" that value and, finally, go the other way round.
The problem is I can't achieve that   .