Special Plates & Image Quality in UV Printing
CMBACRYLIC UV Printing
UV Printing · Special Plates
Special plates explained: how they affect your image quality
Clear and white don't just add shine or backing — they change vibrancy, depth, and how the finished piece actually reads. Here's how each choice affects the result.
Clear White ink Plate modes
Special plates — clear and white — aren't set-and-forget the way your CMYK channels are. They're built in RasterLink's Special Plate and Color Plate functions, and the choices you make there don't just change whether something looks "white" or "glossy" — they directly affect the opacity, depth, and overall quality of the finished image.
Clear
Clear: gloss, depth, and the monochromatic look
For most jobs, Clear Gloss at 80% is the right starting point. It's enough coverage to get a real gloss effect without laying down so much clear that you're wasting ink or risking texture issues.
Clear defaults to matte — you have to set it to gloss
If you want an actual gloss finish, don't assume it's the default. RasterLink's clear plate comes in matte unless you set it up for gloss yourself.
Clear can also do more than add shine. Run clear gloss over matte acrylic instead of gloss acrylic, and you get what we call a monochromatic look — a single-tone piece where the design reads through texture and light reflection rather than color contrast. It's a different kind of image quality entirely: less about vibrancy, more about depth and dimension.
White ink
White ink density: opacity vs. depth
White can run as low as 0% if you're trying to preserve ink, but the percentage you choose is really an image quality decision, not just an ink-saving one. Higher percentages give you more opacity — colors read closer to true, and less of the core material shows through underneath. Lower percentages let some of that material and light through, for a softer, more translucent result. Push it low enough and you approach a stained-glass-style, nearly-transparent look.
Image: Low-density example Near-0% white — a light, stained-glass-style result.
Test before you commit to a percentage
There's no single "correct" white percentage that works across every material and design. Run a few test swatches at different percentages on the actual material you're printing on, and pick the finish that looks right — not just the number that saves the most ink.
Plate modes
Plate modes: where the white actually goes
Separate from how much white you use is where RasterLink puts it. This is where plate choice affects image quality most directly — the same design can read as fully opaque, partially see-through, or something more selective, depending on which mode builds the plate.
Whole Image
White covers the entire artboard evenly. This gives you the most consistent opacity and the truest, most saturated color reproduction — the safest choice when color accuracy matters most.
Valid Pixel
White applies only under pixels that actually have artwork on them — empty or transparent areas stay without white, so your core material shows through as a genuine background instead of a solid backer.
Valid to Non-Background
A more surgical version of Valid Pixel: white applies to your artwork's pixels while specifically excluding anything tagged as a background layer in the file.
Image: Whole Image example Full, even white coverage under the design.
Image: Valid Pixel example White only under the artwork; background shows through.
Where Valid to Non-Background gets tricky
This mode is worth knowing about for things like stickers — jobs where you need white behind the design elements themselves, but not as a full solid backer behind the whole piece. In practice, as the operator running it day to day: it works well on some files and inconsistently on others. Success depends heavily on how the file itself is built — how layers, transparency, and anything meant to read as "background" are set up. Treat it as something to test on the specific file in front of you, not a setting you can assume will behave the same way every time.
Core material color plays into all three modes too — a white core stays closest to how a design looks on screen, a clear core adds real depth since light passes through the unprinted side, and a black core will mute colors somewhat no matter which plate mode you're using.
At a glance
Quick reference
| Setting | Starting point | Image quality effect |
|---|---|---|
| Clear Gloss | 80% | Gloss on matte = monochromatic, texture-driven look |
| White ink | 0%+ | Higher = more opaque/true color; lower = more see-through |
| Whole Image | — | Most consistent opacity, truest color |
| Valid Pixel | — | Core material reads as background |
| Valid to Non-Background | — | File-dependent — test before production |
None of these settings have one right answer for every job — they're starting points. A quick test swatch on the actual material beats guessing every time, especially with white ink and plate mode, where the same design file can come out looking like three completely different products depending on what you choose.
Ready to print
Settings dialed in? Get your material.
Shop the acrylic, wood, and metal blanks for your next job.
Shop UV printing blanks →
