After having a lot of problems with my IP100 I could use a MX925. After printing both files with the highest possible quality I scanned with 1200DPI, the highest I have without interpolation. You can see already the single dots. So it's ok. In the one with 1200 PPI you see in the mid the picture very small. This was the one you had first. Didn't see ist after the print. Thought there is nothing. I used a cheap glossy paper, maybe the OBAs led to the blue points in the scan.