I came across an issue which I’m not sure if it’s pd4ml or pdf related.
Below is code html example that contains a div with repeating image as background. Bacground image is semi-transparent (30×60) and is repeated both horizontally and vertically across the div area (300×300). For some reason each repeated backround parts overlap by 1 pixel creating an unwanted grid in the background. With solid backgound this slipped out of sight but as soon as transparent image was used it was noticed.