Preferred method of reduction

[j3rry]

what is your preferred method of image resizing? My pictures often have to be reduced from 5000 ... 3000px to 1500... 1000px, is there an optimal method to keep the sharpness or do you have to handle this differently from picture to picture? I mostly use the bicubic algorithm.

[Jowday]

1 hour ago, j3rry said:

what is your preferred method of image resizing? My pictures often have to be reduced from 5000 ... 3000px to 1500... 1000px, is there an optimal method to keep the sharpness or do you have to handle this differently from picture to picture? I mostly use the bicubic algorithm.

I don't use Affinity Photo for anything photo related (it is nowhere near Photoshop), so I don't know much about how well the different algorithms perform, but when I checked Photo out I did suggest improved usability - more meaningful labels.

From the help file

Quote

Resampling methods

The following resample settings are available:

• Nearest Neighbor—simple resampling which has the fastest processing time. Use for hard-edge images.
• Bilinear—algorithmic resampling for use when shrinking images.
• Bicubic—algorithmic resampling for use when enlarging images. Resampling is smoother than Bilinear but has a slower processing time.
• Lanczos 3—complex algorithmic resampling which gives the best results but with the longest processing time. Available as 'separable' and 'non-separable'; the latter gives marginally better results, but is slightly slower than 'separable'.

Be advised  that these algorithms can not be compared 1:1 to those in Photoshop. Adobe made a great job on optimizing and enhancing them to their specific purposes fx "reduce size" or "enlarge preserving details."