I have always tried (back from my old MacPaint days) to downsample by an integer amount; along a linear dimension, one pixel in the final image was 2,3,4,... etc., pixels from the original. Back with ancient MacPaint this prevented pixels from migrating at the edges and really messing things up. This integer reduction does not seem necessary with the bicubic interpolation turned on. These articles are specifically NOT using integer reductions; (110% ???), wonder if that is significant, or as fuctious says, just convenient? [The Nyquist stuff gets pretty strange when you are re-sampling "boxcar" approximations. Maybe the original image started out band-limited, but as soon as it turns into discrete pixels it is no longer band-limited. The bicubic interpolation should be working like a low pass filter. I've seen photoshop plugins out there that use higher order interpolation, (sharper filter?).]