The print image is 10,500 X 7,000 pixels with 3x3 oversampling enabled for a total of 31,500 X 21,000 sampled points. Lanczos anti-aliasing is applied using a 9x9 kernel resulting in a high-quality 10,500 X 7,000 image.
This image was created with the Fractal Science Kit fractal generator [link]
Very nice! As I am not a real techie, I was curious. So is your original render 10,500 X 7,000 and you didn't need to render at 31,500 X 21,000, but with oversampling you get essentially the same results? Fractal Explorer has an odd setting where you can choose to anti-alias on three points, four points or nine points, and I wondered if that was a similar to oversampling. Maybe you're not familiar with FE...
Thanks Hal! I generate 31,500 x 21,000 sample points and use this for all fractal processing. Then I apply anti-aliasing to the samples which generates a 10,500 x 7,000 image based on the oversampling setting (3x3); i.e., it replaces 3x3 blocks of samples with a single averaged pixel. The averaging algorithm uses a 9x9 block of samples centered on each pixel to generate the image data. I have not used FE but I suspect it is doing something similar.