SIX ORIGINAL EXPORTS · OCTOBER 19, 2026
Roblox Shirt Template Line Angle: Which Thin Strokes Break on Export?
In our saved Roblox shirt template PNGs, the 45° one-pixel source line had more alpha-128 gaps than 20° or 70° lines. At 45% Image size it had six blank slices along its main direction; the other angles had two each. At 60%, the counts were six versus one. These are exported-pixel measurements, not a prediction of how a shirt looks on an avatar.
A blank slice means no qualifying red pixel in one row or column between the first and last qualifying slices. Alpha cutoff is an analysis choice, not an editor control.
How we kept the comparison controlled
We drew three red, one-source-pixel strokes on separate transparent 150 × 150 canvases. Each line crossed the canvas center at 20°, 45°, or 70°. Its longest coordinate span was 50 source pixels, so each received comparable space before scaling. We imported each into this site's Classic Shirt editor, set Image size to 45% or 60%, moved it to the TORSO FRONT guide, and used Download PNG. Each of the six saved files was 585 × 559 pixels.
We decoded the saved files. A qualifying pixel had red above 150, green and blue below 100, and alpha at or above the selected cutoff. We scanned columns for the shallow 20° line and rows for the 45° and 70° lines, then counted empty slices between the first and last qualifying slices. Choosing the main direction avoids comparing a short vertical span at 20° with a long one at 70°. This is a coverage test, not a perceptual rating.
| Source angle / Image size | Alpha ≥64 | Alpha ≥128 | Alpha ≥192 |
|---|---|---|---|
| 20° / 45% | 0 gaps · 241 px | 2 gaps · 107 px | 65 gaps · 15 px |
| 45° / 45% | 0 · 250 | 6 · 94 | 53 · 27 |
| 70° / 45% | 0 · 241 | 2 · 107 | 65 · 15 |
| 20° / 60% | 0 · 439 | 1 · 187 | 81 · 25 |
| 45° / 60% | 0 · 444 | 6 · 216 | 73 · 35 |
| 70° / 60% | 0 · 439 | 1 · 187 | 81 · 25 |
Each cell reports blank main-direction slices, then qualifying red pixels in the saved PNG. All six files had zero blank slices at alpha ≥1; the table starts at ≥64 to show the informative differences.
What the comparison says
At alpha ≥128, the diagonal had four more empty slices than either slanted comparison at 45% Image size, and five more at 60%. Yet its total qualifying pixel count was higher than the 20° and 70° lines at 60%: 216 versus 187. More qualifying pixels did not guarantee uninterrupted coverage along the line. It matters where those pixels landed after scaling.
The 20° and 70° counts matched each other at every listed cutoff and size. Our drawings were mirror counterparts around the diagonal, and the exported pixels preserved that symmetry under this method. At alpha ≥64, all three angles had continuous main-direction coverage. At ≥192, every angle had many blank slices, although 45° retained more qualifying red pixels. A stricter cutoff can therefore reverse which line looks better by a single metric; examine both coverage and opacity.
A practical check before upload
- Keep the line editable. Draw it on a separate source layer so you can widen it if the export is weak.
- Export at the intended Image size. Put the mark inside the FRONT guide and download the Shirt PNG. Inspect the file you will actually use.
- Look at native pixels and a small preview. Zoomed pixels reveal gaps; a small view shows whether they matter to your intended design. Alpha-64 continuity alone does not establish visibility.
- Revise one variable. Try a wider stroke while keeping source dimensions, color, angle, position, and Image size fixed. Then compare the new saved PNG.
- Test the actual texture in Studio. Roblox's classic clothing guide recommends a Block Avatar rig and Shirt object before upload.
Limits: This controlled test covers synthetic red lines on transparent 150-pixel sources, three angles, two Image sizes, and three reported alpha cutoffs in this browser editor. It does not determine visual continuity on a 3D avatar, at a particular screen size, or after Marketplace processing.
Sources and reproducibility
- Roblox Creator Hub: Classic clothing — primary source for mapped Shirt parts and the Studio test procedure.
- Avatar Shirt Maker editor — first-party import and saved-PNG export tested October 19, 2026.
The project retains the six-export browser script and decoded alpha measurements in its audit folder. The table, coverage graphic, matched-angle comparison, and correction workflow were made for this page.