Question 1

Why do my UV prints have a white halo around the edges?

Accepted Answer

When you remove a background from an image, tools like Canva, remove.bg, or Photoshop's Magic Wand leave behind semi-transparent pixels (alpha 1-254) at the edges. These pixels are invisible on screen but your UV printer's RIP software generates solid white ink underneath them, creating a visible white halo or dusty edge on the final print.

Question 2

How do I fix ghost pixels without Photoshop?

Accepted Answer

Use Ghost Pixel Cleaner — a free online tool that automatically detects and removes semi-transparent edge pixels from your PNGs. Upload your image, adjust the threshold, and export clean CMYK + white underbase files ready for your UV or DTF printer. No Photoshop skills required.

Question 3

Does white underbase choke fix the white halo problem?

Accepted Answer

Choke only shrinks the white underbase relative to solid CMYK edges — it does NOT remove semi-transparent pixels from your source file. If your PNG has ghost pixels, choke alone won't fix the halo. You need to clean the source file first, then apply choke for best results. Ghost Pixel Cleaner does both automatically.

Question 4

Does this work with my eufyMake E1 / Mimaki / Roland UV printer?

Accepted Answer

Yes. Ghost Pixel Cleaner generates standard PNG files with clean alpha channels. The output works with any UV or DTF printer and RIP software including eufyMake E1, Mimaki UJF series, Roland VersaUV, Epson SureColor, and others.

Ghost Pixel Cleaner — Fix the White Halo on UV & DTF Prints