Adjusting sky colours

[John-M (Melbourne, Australia - Win10)]

@Sigi

Have a look at Nik Color Efex

Yes, the Graduated Filter therein works well to emphasise blue in the sky.

@mandarin

Gradient Filter [as Local Adjustment tool in PhotoLab] doesn’t seem to allow manipulation of a single colour within the gradient area

True - but there’s a Request for this that you can vote for here.

Regards, John M