Quote:
Originally Posted by eeyore  strictly speaking you shoulnt use the bicubic interpolation setting for downsizing - only for upsizing.
Interpolation is basically asking the computer to caculate the colour of new pixels based on the colour of those surrounding it - therefore if upsizing you should go up in incremental steps so it only has to caluculate a few at a time - however going down you dont need the interpolation because there are no new pixels to colour in. |
That was the advice when I started learning digital editing around 8 years ago; but current thinking tends to suggest that with today's massive image starting sizes it is better to use BiCubic when doing a substantial downsize.
When starting with, say for example, more than 3000 x 2000 pixels and ending up with around 800 x 500 approx it means that a lot of pixels are being discarded.
My photo editing programme (Serif Photo Plus X3) recommends BiCubic (or better) for substantial resizing in either direction; however, I have asked this question on the Cambridge in Colour photo forums site to see what is the general opinion on this subject worldwide.
I will report back.