Available as 'separable' and 'non-separable' the latter gives marginally better results, but is slightly slower than 'separable'.
Lanczos 3-complex algorithmic resampling that offers sharp results but with the longest processing time. Resampling is smoother than Bilinear but has a slower processing time. Bicubic-algorithmic resampling for use when upsampling images. Bilinear-algorithmic resampling for use when downsampling images. Nearest Neighbor-simple resampling which has the fastest processing time. The following resample settings are available: Select a Resample method from the pop-up menu. Rulers will update to the new measurement unit. (Optional) Select a different measurement unit from the Units pop-up menu. To resize the width and height independently, click the lock icon (to unlock) between the Size boxes. Enter your new document dimensions in the Size boxes-left box for width, right box for height. 
Ensure the Resample option is switched on. You will see no change in the image on the page as this procedure only affects the image's metadata. Set higher values (e.g., 300dpi) for professional printing. Change the DPI to control the number of pixels (dots) which will be printed per inch when your document is printed. Ensure the Resample option is switched off. 
From the Document menu, select Resize Document. Reduce an image for on-screen display and to optimize file size. Enlarge an image to specific dimensions in preparation for printing. Select from a variety of interpolation methods (see note below). Maintain the image's aspect ratio or resize unconstrained. When you resample an image, you have the option to: This will also decrease the image's file size. Decrease the number of pixels in an image (i.e compress it) to make its overall pixel dimensions smaller. This will also increase the image's file size. Increase the number of pixels in an image (i.e stretch it) to make its overall pixel dimensions bigger. The image's pixel dimensions remain unaffected. 
Scaling will embed a specific print resolution into an image's metadata to force it to print at a specific dpi (e.g. These can be undertaken independently or simultaneously. You can change the 'size' of an image by scaling or resampling it. In Affinity Photo there are options to change a document's or image's pixel dimensions and/or print resolution.
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