AI, which isn't guaranteed 100% accurate, offers this...
"Pixillion allows resizing transparent PNG files with several resizing options available, including scaling by percentage, long side, original aspect ratio, predefined frame size, or custom frame size. When resizing using the Print size option (which corresponds to a frame size or custom size), Pixillion adjusts the image dimensions, but the resulting file size depends heavily on the chosen resolution (pixels per inch) and compression settings.
The size reduction from 32MB to 15MB while maintaining quality may happen because a high resolution is retained for print-quality output. Conversely, reducing the file to around 286KB often results from heavier compression or significantly lowering the resolution, which degrades print quality. Pixillion supports controlling pixelation methods (sharp square pixels vs. smooth blurry pixels) and resizing effects but does not specifically offer advanced print DPI control to fine-tune output file size beyond setting the dimensions.
For high-quality print requirements with transparent PNGs:
Use Scale by Custom Frame Size or Predefined Frame Size to set exact physical print size.
Choose sharp pixel options to maintain clarity.
Avoid extreme compression or very low resolution that drastically reduces file size but harms quality.
After resizing, review the file format compression settings to balance quality and file size.
It's generally possible to resize transparent PNGs for print with good quality in Pixillion, but getting the perfect balance between print quality and manageable file size may require testing different dimension and pixelation filter combinations. Pixillion's resizing options allow resizing by print size but do not offer explicit DPI or print resolution fine control that professional print software provides.?