IPA FE Subject A 2024 Question 6
A question IPA Japan published in 令和６年度 基本情報技術者試験 科目A 公開問題 問6, translated into English. ITPEC is based on the same exams.
Same question on ITPEC: Oct 2025 Q17 +1 more
Which of the following is a method used to improve the appearance of a jagged edge of a slanted line so that it appears smooth on a screen, such as that of an LCD?
Explanation
Anti-aliasing — blends the pixels along an edge so a slanted line no longer shows a staircase.
A screen is a grid of square pixels, so a slanted line drawn only with fully on or fully off pixels shows steps, called jaggies. Anti-aliasing gives the edge pixels intermediate colours in proportion to how much of each pixel the line covers, and the eye reads the result as a smooth edge.
Answer (a)
Why not others:
- •(b) Bump mapping — perturbs the surface normals so a flat 3D surface looks rough or embossed
- •(c) Shading — colours a 3D surface by its angle to the light to give it depth
- •(d) Texture mapping — wraps a 2D image onto the surface of a 3D model
Key rule: Jagged edges come from sampling at pixel resolution and are fixed by anti-aliasing; bump mapping, shading and texture mapping change how 3D surfaces look.
Multimedia · AI-written, may contain errors
This question comes from the past questions IPA Japan publishes, translated into English by ITPEC Practice. ITPEC Practice is an independent study tool and is not affiliated with IPA or ITPEC. See the original paper (PDF) or Report an issue.