Challenge 1: A Blurry, Blocky Logo After Enlarging a JPEG — Solution Walkthrough

The answer:

A JPEG is a raster format — it stores a fixed grid of pixel colors.
Enlarging it means stretching those existing, fixed pixels across a
larger area, which is exactly what produces the visible blurriness or
blockiness the colleague is seeing. There's no additional detail to
reveal by enlarging it; the file only ever had as much information as
its original pixel grid.

Why a vector file would have avoided this entirely:

Per this chapter's own material on resolution independence, a vector
version of the same logo stores a mathematical description of its
shapes rather than a fixed grid of pixels. Enlarging it means
recalculating that same description at a larger size, producing an
identically crisp result at banner size as it would at business-card
size — no stretching of existing pixels involved at all.

What the colleague should ask for next time:

A vector format (such as an AI, EPS, or SVG file) for anything that
might need to be resized significantly, especially logos — exactly the
kind of clean, geometric content this chapter identifies as vector's
own strength.

WHY THIS WORKS AS AN ANSWER
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This exercise checks that raster enlargement blur is correctly traced
back to a fixed pixel grid being stretched, and that a vector file's
resolution independence is identified as the actual fix.