retina MBP 15 inch 2015 temperature and fan speed noise?...

Any help or input would be helpful about this... ( hopefully i'm just paranoid) lol

But..

A few hours ago I was resizing some HD photos in pixelmator and Acorn and had safari running in the background when my MacBook pro's fans began whirling up pretty loud-ish, the temperature was around between 43-70c I think. I closed the programs and

it took about 30 or less seconds for the temps to drop from 70c-is to in the 60-50c-ish then it dropped significantly faster (back to normal) when the fans were around 4000-5000 speeds, (the fans died down after 3 minutes.)

The next thing I did was I opened disk utility and right after opening it the fans and temp became loud and hot again, is this normal? I don't recall if my 2014 had this issue as I didn't have pixelmator. (but disk utility did cause the fans to go on in my 2014 MBP.)

The reason I started that up today was to try and get a reading of the CPU temps....

anyhoo...

I really don't want to have to take this guy in to Apple if I don't have to.

So does anyone know if pixelmator/or other art programs (acorn) and safari are heat hogs?

Like is this all pretty normal?

Thanks again for any help, it is much appreciated. 🙂

Kal.