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W3Schools 튜토리얼을 P-Reinforce v3.1 포맷으로 위키화(영어 본문, 한/영 섹션 헤더). - Topic_HTML: 59문서 (튜토리얼+예제, 레퍼런스/메타 제외) - Topic_CSS: 190문서 (메인 + Advanced/Flexbox/Grid/RWD 전체) - Topic_JavaScript: 120문서 (코어 언어; Temporal/DOM상세/BOM/WebAPI/AJAX/jQuery/Graphics 등은 후속) 각 폴더 00_INDEX.md(MOC) 포함. 코드 verbatim, 미확인분은 "Not found in source" 표기. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
76 lines
4.1 KiB
Markdown
76 lines
4.1 KiB
Markdown
---
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id: css-image-effects
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title: "CSS Image Effects"
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category: "Frontend"
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status: "draft"
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verification_status: "conceptual"
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canonical_id: ""
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aliases: ["image opacity", "image transparency", "text on image", "image text positioning", "image effects"]
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duplicate_of: ""
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source_trust_level: "B"
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confidence_score: 0.85
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created_at: 2026-06-23
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updated_at: 2026-06-23
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review_reason: ""
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merge_history: []
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tags: ["css", "web", "frontend", "w3schools", "images", "opacity"]
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raw_sources: ["https://www.w3schools.com/css/css3_images_effects.asp"]
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applied_in: []
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github_commit: ""
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---
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# [[CSS Image Effects]]
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## 🎯 한 줄 통찰 (One-line insight)
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The W3Schools "CSS Image Effects" page covers two effects: making images transparent with the `opacity` property, and overlaying text on an image positioned at the corners or center. [S1]
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## 🧠 핵심 개념 (Core concepts)
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- **Image opacity** — the `opacity` property controls how transparent an image is, taking values from `0.0` (fully transparent) to `1.0` (fully opaque). [S1]
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- **Partial transparency** — values between, such as `0.5`, render the image partially see-through. [S1]
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- **Text on an image** — text can be overlaid on an image and positioned at the top left, top right, bottom left, bottom right, or centered. [S1]
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## 🧩 추출된 패턴 (Extracted patterns)
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- **Opacity as a 0–1 dial** — transparency is a single continuous value where lower means more see-through, useful for hover dimming or watermark effects. [S1]
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- **Corner-anchored overlay** — positioning text over an image relies on a positioned container with the text element placed against a chosen corner or centered. [S1]
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## 📖 세부 내용 (Details)
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**Image opacity / transparency**
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The `opacity` property specifies the transparency of an image. It accepts a value from `0.0` to `1.0`: the lower the value, the more transparent the image. A value of `0.0` makes the image fully transparent, an intermediate value such as `0.5` makes it partially transparent, and `1.0` is the default (fully opaque). [S1]
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**Image text positioning**
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Text can be placed on top of an image and positioned in different spots: top left, top right, bottom left, bottom right, or centered. The fetched content describes these positioning options but does not include the inline CSS declaration blocks for each placement — those appear only behind the page's "Try it Yourself" examples. The exact per-position CSS is "Not found in source". [S1]
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> Note: The page title "CSS Image Effects" on W3Schools does NOT cover image reflection (`box-reflect`). The fetched content confirms the page is limited to image opacity/transparency and image text positioning. [S1]
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## 🛠️ 적용 사례 (Applied in summary)
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The source's applied cases are the opacity-based transparency demos (full, partial, and full opacity) and the text-over-image positioning demos. No external project/commit applications found in the source.
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## 💻 코드 패턴 (Code patterns)
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Image transparency dial (language: CSS):
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```css
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img {
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opacity: 0.5;
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}
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```
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## ⚖️ 모순 및 업데이트 (Contradictions & updates)
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No contradictions found in the source. Note that the per-corner text-positioning CSS was not present inline in the fetched content (marked "Not found in source" above).
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## ✅ 검증 상태 및 신뢰도
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- **상태:** draft
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- **검증 단계:** conceptual (실제 적용 사례 발견 시 applied/validated로 승격 가능)
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- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
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- **신뢰 점수:** 0.85
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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:** [[CSS Tutorial]]
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- **관련 개념:** [[CSS Image Hover]], [[CSS Image Filters]], [[CSS Image Styling]], [[CSS Position]]
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- **참조 맥락:** Referenced when dimming images via opacity or labeling images with overlaid text.
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## 📚 출처 (Sources)
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- [S1] W3Schools — CSS Image Effects — https://www.w3schools.com/css/css3_images_effects.asp
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## 📝 변경 이력 (Change history)
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- 2026-06-23: Initial draft synthesized from the W3Schools "CSS Image Effects" page (Astra wiki-curation, P-Reinforce v3.1 format).
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