Message
Re: [QuadtoneRIP] Re: Banding On the Epson P800
2017-02-08 by efo@...
The image is actually a 600 dpi scan of a 2880 printout. Yes, it's very subtle but it's visible in the darkest area at the bottom. It does look like a beat pattern or moire. That section of the image is actually a constant black (it's a border added to the image) if it matters. The image is probably 570 pixels per inch (a 2 1/4 negative scanned at 2400 dpi). But on the other hand, it only happens in the feed direction, which I wouldn't really expect if it's beating between qtr vs my image.
Another odd thing is that when I switch to bidirectional printing I seem to get this same effect but at about twice the vertical frequency.
That dithering of gray values (the gradient) is film grain from the original negative.
If anyone can suggest any tests that would be helpful, I'm happy to try them. I've thought of turning off the various ink channels to see if it's happening in all inks, or doing something to trick the printer into changing the media thickness (using the front feed, maybe?), or printing at 1440, or printing on different media. But not knowing what would be informative, I haven't tried anything.
For now I'm using ABW, which is of course sad since I've been a happy QTR person for quite a few years!!