DPI (Dots Per Inch) is the universal metric defining image resolution and print clarity. For apparel printing, artwork files must be prepared at a minimum of 300 DPI at 100% of final physical print dimensions. While computer monitors display graphics at 72 DPI (which looks crisp on screen), printing a 72 DPI web image onto a t-shirt results in visible pixelation, jagged stair-stepped curves, and blurry details.
The Math Behind 300 DPI vs. 72 DPI in Garment Production
A graphic designed at 1200 × 1200 pixels looks huge on your phone screen, but if you want to print it across a 12-inch wide chest, that file only provides 100 dots per inch. The printer is forced to stretch those pixels, causing blurry, low-grade results.
To achieve razor-sharp 300 DPI across a 12-inch chest canvas, your digital graphic file must measure at least 3,600 × 4,500 pixels (12" × 300 = 3600 px). At 300 DPI, fine photographic details, subtle gradients, and sharp lettering reproduce with laser-like fidelity.
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