Cura 4.5 includes support for alpha channels in PNG images which could be a solution to your problem. You can download it here.
A stable release is scheduled for tomorrow.
Support for alpha channels in ImageReader. Added support for images with transparency, such as PNGs. When using an image with transparency, the contours of the transparent layer will be followed. Contributed by BagelOrb.
Thanks for the heads up, Cura 4.5 works perfectly
Alternatively you can use an older version of cura and put a gray circle under that circle of dots. A solid gray background but not rectangular - circular. And set the base thickness to zero.
Set the base thickness to zero. I guess you are making a lithopane?
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