The L1800 driver is not a true RIP. It cannot interpret PostScript. If you send a PDF with complex vector masks, the driver relies on your OS (Windows GDI or Mac Core Image) to flatten it first. This is why vector graphics often print softer than raster images on this machine.
You bought an L1800 for sublimation? You voided the warranty the second you put different ink in it. Fine. Here is the driver secret no one tells you:
In simple terms, the driver is a translator. It converts the complex data from your computer (whether it’s a high-resolution photo in Adobe Photoshop or a PDF blueprint) into a language the Epson L1800 understands. Without the correct driver, your computer won’t recognize the printer, or worse, it will print garbled, incomplete, or low-quality pages.
If you are printing from Lightroom, Photoshop, or Capture One, you must the driver’s color correction.