Enlarging bitmap images

[William Overington]

I have some digital photographs. In fact gathered from a web cam. They are action images of a steam locomotive.

I want to enlarge them using the Transform panel of Affinity Designer. I am working in pixels as the meaurement unit.

I have previously used exactly twice and exactly three times, calculating new values from those shown in the Transform panel.

Yet given the size of the image, and the size needed or the card, aspect ratios different so some cropping somewhere for a full field result, a magnification somewhere between 2 and 3 would seem best as a factor of 2 leaves white space vertically, yet a factor of 3 would crop a lot off both horizontally and vertically.

I appreciate that ideally I would not do this enlarging, but i want prints of customized greetings cards and it is a matter of either get something with what i have got or go without.

My question is this please. What multipliers are safest and which are likely to give results that have pecuiar effects if the enlargement factor is other than a small integer?

More generally, do people enlarge digital photographs and if so, how please?

How does Affinity Designer enlarge please?

William

 

[v_kyr]

Affinity Photo (bitmap images):

• Five Ways to Resize Images in Affinity Photo
• Change image Size without losing Quality
• Sci-Fi is Now Reality - (Affinity Photo Tutorial)
• ImageEnlager (Online)
• ... and so on, do an internet search ...

Affinity Designer (vector images):

• Should be a nobrainer for plain vector imags here