Step 4 — And Then: Pixels
For speed, most of that carving happens on a small, compressed sketch of the image rather than on the full-resolution picture — think of it as working on a thumbnail. A final decoding step expands that sketch into the actual pixels you download.
You never see this step, but it leaves fingerprints, and recognising them saves you from chasing prompt fixes for problems your prompt didn't cause:
- Small faces and hands in wide shots come out mushy. In the compressed sketch a distant face is only a few marks wide; there simply wasn't room for the detail. The fix is composition or a face-aware upscale — never a longer prompt.
- Fine repeating patterns wobble. Chain-link, houndstooth, brickwork, crowd scenes, distant text.
- This is the natural resolution ceiling. Every tool has a size it was built for. Ask for something far larger in one shot and you get duplicated limbs and repeated horizons. Generate at the native size, then upscale.