Images on Commentary of Takao

優化影像：WebP 與 AVIF 以及響應式尺寸

Tue, 15 Jul 2025 00:00:00 +0900

介紹

優化影像資源是提高 Lighthouse 分數和 LCP（最大內容繪製）等 Web 效能指標最有效的方法之一。

在許多 Web 應用程式中，圖像佔總負載大小的一半以上。緩慢的圖像載入時間直接降低了用戶體驗。

Image 優化 Strategies 2024: AVIF, WebP, and Beyond

Tue, 02 Jul 2024 00:00:00 +0900

Introduction

Images account for over half of the typical webpage’s total weight. As web applications grow more visual, optimizing image delivery has become critical for performance, user experience, and Core Web Vitals scores. This article explores modern image optimization strategies, from next-generation formats to responsive delivery techniques.

Image Formats in 2024

The image format landscape has shifted dramatically. Three modern formats now compete for dominance alongside legacy JPEG and PNG.

Next.js Image 優化: From 設定 to 進階 Patterns

Tue, 26 Mar 2024 00:00:00 +0900

Introduction

Images account for over 50% of total webpage bytes on average, making optimization essential for performance. Next.js provides a comprehensive image optimization pipeline through the next/image component and its built-in Image Optimization API. This article covers setup, configuration, and advanced patterns with a focus on Core Web Vitals impact.

The next/image Component

The next/image component extends the HTML <img> element with automatic optimization features: lazy loading, responsive srcset generation, width and height enforcement to prevent Cumulative Layout Shift, blur-up placeholders, and automatic format negotiation.