How much a shoe panel enlarges your artwork

The complaint is almost always the same shape: the file looked sharp on screen, and one panel came back soft. Not the whole shoe — one panel. Usually a heel counter, or the strip along the eyestay.

There is a good reason it is one panel and not all of them. A shoe is not printed as a single image. It is printed as a set of flat pieces, and each piece samples its own region out of your artwork. A small piece that samples a small window has to enlarge that window a long way to fill its own production raster. A large piece sampling a large window barely enlarges anything. So the enlargement ratio is a property of the panel, not of your file — and on the 14-panel Classic Low-Top it runs from 2.64× on the easiest piece to 4.77× on the hardest, a 1.8× spread inside a single pair.

That spread is what this page is about. It is also the reason a single vague rule like "use a high resolution image" helps nobody.

Two questions that sound like one

"How much is my artwork enlarged?" and "how many pixels do I need?" feel like the same question. They are not, and mixing them up produces bad advice in both directions.

The 4.79× figure sounds alarming — as if you needed a nine-thousand-pixel file. You do not. That panel's sampling window is only 146.70 × 216.91 design units wide, so even at 4.79× the production raster is just 702 × 752 pixels. The absolute number is what matters to your file, and it is 2,268 pixels of width. The ratio matters only to the printer, who cares how much softness the enlargement introduces.

How the number is computed

Every panel in our library carries two pieces of geometry: the rectangle it samples from the design canvas, and the pixel size of its production raster. The required scale is the largest ratio across both axes, and the file width follows from the canvas width.

scale = max over panels of max( rasterW / windowW , rasterH / windowH )
requiredWidth = canvasWidth × scale

Worked through on the worst offender in the range — the Blade Sneaker's fourth panel:

The horizontal axis binds, so the required scale is 4.79 and a file 2,268 pixels wide leaves that panel with 702 real pixels across its 702-pixel raster. Below that, the panel is being upscaled — gradually, not catastrophically, but measurably.

The per-style numbers

Eight styles, 66 panels. Two of the styles ship in two colourways with identical panel geometry, so the table shows six distinct patterns. Panel counts are per pair; the last column is the file width in pixels for that panel to reach the printer at 1:1.

Two things stand out. The everyday sneaker is the cheapest style to fill — 10 large panels that need only 1,558 pixels. The sprawling 18-panel low-top is the opposite of what people expect: eighteen panels sounds like eighteen small windows, but the largest ones are big enough that the whole style resolves at 1,924 pixels, less than the four-panel Blade. Panel count and resolution demand are almost unrelated.

The one genuinely awkward style is the 14-panel Classic Low-Top. Its median ratio is a mild 3.15×, but a single narrow panel samples a window 111.04 units wide into a 530-pixel raster, which demands 2,916 pixels of file width — more than anything else in the range. A median tells you how a style usually behaves. It does not tell you whether one panel will let you down.

Across all 65 measured panels

Averaging the range into one recommendation hides the shape of the data, so here is the distribution of required file width instead.

The median is 1,673 pixels — well under the round number most people would guess. But the distribution has a long tail: the last five percent of panels sit above 2,301, and the very last one jumps to 2,916. In practice the panels cluster into two families, which is why the coverage curve below has visible steps rather than a smooth slope.

What each upload size actually covers

Read this as: upload a file in the canvas aspect ratio at this width, and this share of the 65 panels arrives at the printer at native resolution or better.

Two flat stretches are visible, and both have the same cause: a gap in the data. Between 1,400 and 1,600 only three more panels clear, because nothing in the library lands in that band — the everyday sneaker family tops out at 1,558 and the low-top family does not begin until 1,612. Between 2,400 and 2,800 the curve does not move at all, because the only panel still above 2,400 sits at 2,916 on its own.

Why we say 2,000 pixels, and not 3,000

2,000 pixels of width puts four panels in five at native resolution, and the remainder are upscaled by at most 1.46×. Leather printed at production resolution absorbs that: it is not a screen, and the print is not viewed from thirty centimetres.

3,000 pixels solves everything and costs every customer a slower upload, a heavier file and a longer wait on mobile data, for a difference that disappears under stitching on a curved panel. 2,400 is the honest ceiling — 98% covered, and the two panels it misses are on the style where the difference is least visible. Above 2,400 you are buying nothing.

The panel that is missing from the data

Sixty-six panels, sixty-five measurements. One panel — the fourth piece of the second Everyday Sneaker colourway — carries a corrupt sampling box in the source library, an extent of roughly 1 × 10²² units that cannot be a real window. It is excluded from every number on this page rather than patched with a guess.

We are mentioning it because a published measurement you cannot audit is worth very little. If a panel is missing from the count, that is a defect in our data, and the honest move is to say so and let the reader see the shape of the gap. It is also why the panel preview tool skips that one piece: it would draw nothing and look like a bug in your browser.

Check your own file against these numbers

You do not have to trust a table. The panel preview runs the same sampling and cutting step in your browser: choose a style, upload an image, and you get every panel as it will actually be cut, with the production pixel size printed underneath each one. If a panel is soft, it is soft there first.

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