... are some images to illustrate that: Original crop from your 400% image: 2_031102_590000000.png Simple shrink zoom to 25% of that= your 100%. Notice that some lines are missing (discarded detail): 2_031120_200000000.png Resampled to same size using various algorithms: Lanczos3 Triangle Mitchell Bspline Bell 2_031103_440000000.png 2_031102_590000004.png 2_031102_590000003.png 2_031102_590000002.png 2_031102_590000001.png Instead of simply discarding detail which doesn't fit, it is merged into the adjacent pixel. The result is a softer image but a better representation of the original. Resampled to 12.5%= your 50%: Lanczos3 2_031109_570000000.png At this size there just aren't enough pixels to contain anything more than a smeared effect. The grating area is only 28 pixels wide and you have 47 "lines" in your diagram (grating bars and spaces between them). I'm not sure where your problem lies or what all this demonstrates? Your image is just fine. regards, Martin. posted: 3 Oct 2010 18:06 from: Brian Nicholls Hi Martin, Thanks for the information, in particular the parts related to the use of various algorithms to ...