Using Illustrator CC 2015.
I created a circle shape and the I select the fill color to be a bright red Red:255 G:0 B:0.
Problem is that the shown color of the circle is not red but a kind of orange.
I made sure that the circle:
- has Opacity: 100%
- the layer is at the very top of all other layers
- No masks
The Color Mode of the document is RGB
That looks like:
- You have got the object fill (circle / square) set to OVERPRINT (check in the
ATTRIBUTESpanel) this will cause the colours to mix.
- You have got
OVERPRINT PREVIEWturned on (which is why the colour is showing as a mix of red and yellow, i.e. orange).
- You have
PROOF SETUPset to
WORKING CMYK(which is why the colour appears dull, because you can’t print bright oranges out of CMYK).
Hopefully one, more or all of the above will help.