I’m using Mask AI v1.0.5 as a standalone product. My initial tif file is 8256x5504 at 240 dpi. After creating a composite mask with a solid color background, the “save as” file size is only 4000x2667 at 240 dpi.
I’m not sure as DPI is treated as a print option and mask shouldn’t even be interested as it has has no bearing on the app. Besides 240 doesn’t even divide into 4000.