fmw42 wrote: ↑2017-11-11T17:27:07-07:00
Since your 1080 image is larger than your 540 by about 2 in height, have you tried
<description>Horizontal Lines 4x2 (bounds adjusted)</description>
<levels width="4" height="2" divisor="10">
Sorry, I know little about dithering and how the divisor works. You may have to create your own new dither pattern.
You can but it only works for double the resoultion, and it can look 'blocky'.
Note that in this case you would only need to double the height, not the width as the pattern is tiled, across the image. Doesn't make a difference either way.
Also the effect will still not be the same as each pixel will be decided by the pixel colors at that location.
Ordered dithers do not have any real concept of 'neighbourhood'. each pixel is decided purely on the pixel, and the threshold level tiled onto the image at that point. So as the higher resolution image has finer and more highly detailed edges, the resulting dither will also have the same effect.
This I believe is the real problem the OP is dealing with.
Now if you were to use a larger dither pattern and blur (or use a morphlogy "erode" or other morphological operator) on the image before dithering, so to enlarge and thicken the fine details, and perhaps use a larger dither tiling patter, then you may get something that looks about right.