A photograph can contain thousands of pixels and still appear as a small thumbnail. The stored image has its own dimensions, while the interface chooses how much space it occupies. Confusing those two measurements makes image quality harder to explain.
A display may use more than one physical pixel for each unit of interface space. This can make a suitable high-resolution image look crisp, but extra detail is useful only if the viewer can see it at the chosen size.
Compare a picture at its actual display size before judging an export. Look at edges, small text, and fine texture. The useful question is whether the file carries enough detail for its purpose without carrying far more than the experience needs.
Imagine a practical setting.
Consider enlarging a tiny photograph until individual squares become visible. The stored samples describe the image, but enlargement cannot reveal detail that was never captured.
Before the next experiment.
Keep one concrete question beside a technical term. The definition matters more when it explains something you have seen, changed, or tried to accomplish.
- Distinguish image dimensions from display size.
- Inspect the result at its intended scale.
- Keep detail that helps the viewer.
Follow a related question
Name the conditions that change a response.
Caching: the art of useful reuseAttach the list to a clear moment.
A checklist that fits the taskKeep learning
Related background to continue exploring this subject.
MDN: how the web works MDN: image file formats
