docs(10_Wiki): Dev 폴더 누락분 반영 — Topic_Programming으로 통합
이전 재구성 작업에서 Dev/ 폴더가 누락되었던 것을 반영. - Dev/Topic_Programming(중첩 폴더, 78개)은 Dev 자체 최상위 폴더들 (Architecture/Conventions/Engineering_Intelligence 등)과 완전 중복이라 제거. - Dev 최상위 엔지니어링 지식 폴더(Architecture/Conventions/Engineering_Intelligence/ Failure_Library/Generalized_Principles/Language/Pattern_Catalog/Platform_Guides/ Subsystems, 77개)는 이미 Topic_Programming/Topic_Programming에 더 최신 버전이 존재해 중복 제거(고유 콘텐츠 1개는 예외 처리하여 이동 보존). - Dev의 W3Schools 언어 튜토리얼 폴더(Topic_C/CPP/CSS/CSharp/HOWTO/HTML/Java/ JavaScript/PHP/Python/SQL/W3CSS, 1201개)는 전부 Topic_Programming 하위로 이동. - 에이전트 운영 상태(.astra/docs)는 그대로 유지, 콘텐츠 폴더만 정리. - Topic_Programming 최종 문서 수: 2784 → 3985.
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Antigravity Agent
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---
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id: w3css-images
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title: "W3CSS Images"
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category: "Programming_Language"
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status: "draft"
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verification_status: "conceptual"
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canonical_id: ""
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aliases: ["w3-image", "grayscale sepia", "W3.CSS 이미지"]
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duplicate_of: ""
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source_trust_level: "B"
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confidence_score: 0.89
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created_at: 2026-07-04
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updated_at: 2026-07-04
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review_reason: ""
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merge_history: []
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tags: ["w3css", "css-framework", "w3schools", "images"]
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raw_sources: ["https://www.w3schools.com/w3css/w3css_images.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[W3CSS Images]]
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## 🎯 한 줄 통찰 (One-line insight)
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`w3-image` scales DOWN but never scales UP beyond the image's original size — a deliberate one-directional responsiveness distinct from `style="width:100%"` (which scales both up and down), meaning `w3-image` is the right choice specifically when you want a photo to shrink gracefully on small screens without ever appearing artificially blown-up/pixelated on large ones. [S1]
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## 🧠 핵심 개념 (Core concepts)
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- **`w3-round` / `w3-circle` / `w3-border`** — reused shape/border classes apply directly to `<img>`. [S1]
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- **`w3-image`** — responsive: scales DOWN to fit container, never scales UP past original size. [S1]
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- **`style="width:100%"`** — scales both up AND down (fully fluid), unlike `w3-image`. [S1]
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- **`w3-opacity` / `w3-opacity-min` / `w3-opacity-max`** — three opacity intensity tiers. [S1]
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- **`w3-grayscale` / `w3-sepia`** (with `-min`/`-max` variants) — visual filter effects; NOT supported in IE11 and earlier. [S1]
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- **`w3-hover-opacity` / `w3-hover-grayscale` / `w3-hover-sepia`** — effects applied only on hover. [S1]
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- **`w3-hover-opacity-off`** — the inverse: an already-transparent image (`w3-opacity`) becomes FULLY opaque on hover, rather than the more common "transparent on hover" pattern. [S1]
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- **Photo album via Responsive Grid** — `w3-third` + `w3-card` + `<img style="width:100%">` + `w3-container` caption, repeated for a gallery layout. [S1]
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## 📖 세부 내용 (Details)
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- Never-scale-up responsive image: `<img src="img_lights.jpg" alt="Lights" class="w3-image">`. [S1]
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- Fully fluid (scales both ways): `<img src="img_lights.jpg" alt="Lights" style="width:100%">`. [S1]
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- Grayscale (not IE11-safe): `<img src="image.jpg" class="w3-grayscale">`. [S1]
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- Inverse hover effect: `<img src="snowtops.jpg" class="w3-opacity w3-hover-opacity-off" alt="Alps">` — starts transparent, becomes fully opaque on hover. [S1]
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## ⚖️ 모순 및 업데이트 (Contradictions & updates)
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- **grayscale/sepia의 브라우저 제약**: w3-grayscale과 w3-sepia 클래스 모두 IE11 이하에서 지원되지 않는다는 점이 각각 명시적으로 경고됨. [S1]
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## 🛠️ 적용 사례 (Applied in summary)
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현재 발견된 실제 적용 사례가 없습니다 — Responsive Grid(w3-third)로 구성한 사진 앨범이 반응형 이미지 갤러리의 대표 실전 사례다. [S1]
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## 💻 코드 패턴 (Code patterns)
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Image that fades in on hover, from transparent to fully opaque (HTML):
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```html
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<img src="snowtops.jpg" class="w3-opacity w3-hover-opacity-off" alt="Alps">
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```
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## ✅ 검증 상태 및 신뢰도
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- **상태:** draft
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- **검증 단계:** conceptual
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- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
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- **신뢰 점수:** 0.89
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- **중복 검사 결과:** 신규 생성 (New discovery)
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## 🔗 지식 그래프 (Knowledge Graph)
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- **상위/루트:** [[W3.CSS Tutorial]]
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- **관련 개념:** [[W3CSS Lists]], [[W3CSS Input]], [[W3CSS Effects]]
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- **참조 맥락:** 이미지 반응형/효과 — 입력 폼(Input) 챕터로 이어짐.
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## 📚 출처 (Sources)
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- [S1] W3Schools — W3.CSS Images — https://www.w3schools.com/w3css/w3css_images.asp
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## 📝 변경 이력 (Change history)
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- 2026-07-04: Initial draft synthesized from the W3Schools "W3.CSS Images" page (Astra wiki-curation, P-Reinforce v3.1 format).
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