Thank you for your reply.
I have been thinking about it and did some prints tests from various places using different settings.
I have taken photographs of the prints, and have arrived at this conclusion: the image in Affinity is not as good quality as when l do a direct photocopy with my scanner printer.
I use Windows Fax and Scan program to scan and save the pictures l then print from affinity.
Those scans with that program are not as good regardless of the setting l choose.
I use colour scanning setting on Windows Fax and Scan because black and white scanning makes more black dots happen all over the page.
As you will be able to see in one of the pictures, the print from affinity is worse quality as the print from the same scan with 300dpi colour, printed from Windows Fax and Scan.
Now this is where it didn't make sense to me, l have done nothing on Affinity, just opened it, and it adds lots of grey which doesn't show in the Windows scan and Print program.
I have had this problem a long time, and someone who rarely visits once took my document which was showing pixels when printed in Affinity, and opened it using another program, maybe something like Words which I don't understand how how to use, and he managed to get the prints with less pixels showing, smoother pictures.
As I said, l never used to have this occasion issue with Photoshop, ( even though Photoshop is worse to use for light users like me, Affinity is slightly easier to understand and work with, shame it hasn't its own scanner option like Photoshop had).
It works be nice to sort it, if you recommend to use another scanner program rather than this Windows Scan and Fax, one to experiment with, fell free to tell me and I will try to download it and scan with it.
Close-up of Affinity print without doing anything to it Close-up of the Windows and Fax scanner, 300 DPI, in colour setting
Prints from the fax Windows program, using both 600DPI scanning and 300 DPI, both in colour. Prints from Afinity (nothing done to it, just opened) and on the right the direct photocopy scan which is the most perfect.
Printed from both Affinity and Windows Scanner, after scanning using the black and white option: it is full of added dots.