FOUR ORIGINAL EXPORTS · SIXTEEN PIXEL READINGS · OCTOBER 18, 2026
Roblox Shirt Template Thin Line: Why Alpha Cutoff Changes the Gaps
A thin line in a saved Roblox shirt template can count as continuous or broken depending on which partially transparent pixels you include. In our 150 × 150 source test, the same exported diagonal had zero blank rows at alpha ≥64, six at alpha ≥128, and 53 at alpha ≥192 when Image size was 45%. The cutoff is a way to inspect the PNG, not an editor setting. Check the downloaded file visually and test it on an avatar before judging the design.
The measurements describe exported PNG pixels; they do not establish how the shirt appears in Roblox Studio.
One saved file, four ways to count its line
We drew a red, 45-degree, one-pixel stroke on a transparent 150 × 150 source, running from one-third to two-thirds of each axis. A proportionally matched comparison used a four-pixel stroke on a 600 × 600 source. Each source was imported into this site's Classic Shirt editor at 45% and 60% Image size, moved to the TORSO FRONT guide, and exported using Download PNG. All four saved PNGs measured 585 × 559 pixels.
We decoded each downloaded image. A qualifying line pixel had red above 150, green and blue below 100, and alpha at or above the stated cutoff. Within the first and last rows containing such a pixel, we counted rows with none. This is a repeatable coverage measure. Alpha 1 includes nearly invisible fringe pixels; alpha 192 demands much stronger opacity. Neither number is a universal visual-quality rule.
| Source / Image size | Alpha ≥1 | ≥64 | ≥128 | ≥192 |
|---|---|---|---|---|
| 150 px / 45% | 0 rows · 412 px | 0 · 250 | 6 · 94 | 53 · 27 |
| 150 px / 60% | 0 rows · 732 px | 0 · 444 | 6 · 216 | 73 · 35 |
| 600 px / 45% | 0 rows · 458 px | 0 · 254 | 0 · 250 | 0 · 84 |
| 600 px / 60% | 0 rows · 562 px | 0 · 337 | 0 · 334 | 0 · 334 |
Each cell shows blank rows between the first and last qualifying line row, then the total qualifying red pixels. The cutoff is applied after export to the same PNG for each source and Image size pair.
What changed in the pixel count
At 45% Image size, tightening the cutoff from 64 to 128 reduced the small-source count from 250 to 94 pixels: 156 no longer qualified, a 62.4% reduction. Moving from 128 to 192 retained only 27 of those 94 pixels, with 53 blank rows in the measured span. At 60%, the same cutoff change from 64 to 128 reduced 444 pixels to 216, while the blank-row count went from zero to six. These comparisons reuse the same saved files, so the difference comes from measurement criteria.
The larger source provides a useful control. At 45%, it had zero blank rows at every tested cutoff, although qualifying pixels fell from 458 at alpha 1 to 84 at alpha 192. At 60%, its alpha-128 and alpha-192 counts both happened to be 334. That equality is specific to this export; it is not a promise about all high-resolution artwork. Source size, stroke construction, and browser resampling all matter.
A useful workflow for fine lines
- Keep a source you can revise. Preserve the line on an editable layer so its width can be increased without rebuilding the shirt.
- Export the actual Shirt file. Place art inside the FRONT guide, use Download PNG, and keep the resulting 585 × 559 file. The preview is not the evidence for saved pixels.
- Inspect twice. Zoom to native pixels to find weak or interrupted strokes, then view the whole file at a realistic display size. A faint alpha fringe can satisfy a low cutoff while remaining hard to see.
- Change one input at a time. If a line looks weak, try a wider source stroke or a higher-resolution source with the same proportions. Export again at the same editor Image size and position before comparing.
- Check on a Block Avatar in Studio. Roblox's official classic clothing guide recommends testing before upload and describes a Block Avatar rig with a Shirt object. Use the exact exported texture for that visual check.
Limits: We tested a synthetic red 45-degree stroke, two source resolutions, two editor sizes, and four alpha cutoffs. Blank rows at a high cutoff do not prove a visible break, and zero blank rows at a low cutoff do not prove legibility. We did not test other colors, angles, real text, physical devices, Studio rendering, or Marketplace acceptance.
Sources and reproducibility
- Roblox Creator Hub: Classic clothing — primary source for mapped FRONT dimensions and the Studio Block Avatar procedure.
- Avatar Shirt Maker editor — first-party import, sizing, drag, and PNG export tested on October 18, 2026.
The project retains the browser test script and decoded measurements in its audit folder. The four-export, sixteen-reading table, cutoff calculations, diagram, and revision workflow were produced for this article.