DPI
Dots Per Inch
A measure of print resolution indicating how many dots of ink are placed per inch.
Technical Detail
DPI determines the level of detail an image can capture. In digital imaging, resolution is typically stated as width x height in pixels (e.g. 3840x2160 for 4K). For print, PPI (pixels per inch) maps these pixels to physical dimensions — 300 PPI is standard for professional printing while 72-96 PPI suffices for screen display. Increasing resolution beyond the original capture requires interpolation algorithms (bicubic, Lanczos) that estimate new pixel values, which adds softness rather than true detail.
Example
```javascript
// DPI: processing with Canvas API
const canvas = document.createElement('canvas');
const ctx = canvas.getContext('2d');
ctx.drawImage(sourceImage, 0, 0);
const imageData = ctx.getImageData(0, 0, canvas.width, canvas.height);
// Process pixels in imageData.data (RGBA array)
```
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