What's Changed

A lot of new features and improvements.

PRs

• Introduce Mocha for unit testing by @tshino in #111
• Add coverage report to unit test by @tshino in #115
• Remove old tests that use a hand-crafted test framework by @tshino in #136
• Update Node from 16 to 18 by @tshino in #149
• Enable eslint9 by @tshino in #179

Full Changelog: v2.0...v3.0

New Feature

• #1 Color Value Picker (displays RGB value of clicked point)
• #20 3D Color Distribution (displays RGB color space in 3D)
  
• #19 Tone Curve Estimation (compares brightness of two images)
  

Enhancement / Improvement

• #15 Flip single picture view by TAB key
• #13 Add offset option to Image Diff
• #22 Improvement of touch input (responsiveness of pinch zoom etc.)
• #23 Improvement of zooming behaviour of figures
• #24 Fix: Horizontal axis of Waveform doesn't reflect Exif orientation tag

リリース v2.0

新機能

• #1 カラーピッカー機能（クリックした場所のRGB値を表示）
• #20 3次元色分布（RGB色空間を立体的に表示）
  
• #19 トーンカーブ推定（2つの画像の明るさを比較）
  

改良／拡張

• #15 TABキーによる画像の切り替え表示
• #13 画像のdiffにオフセットオプションを追加
• #22 タッチ入力の改善（ピンチズームの追従性など）
• #23 ヒストグラムなどの図をズームする動作の改良
• #24 波形（Waveform）の横軸がExifの回転情報を無視していた問題を修正

This is the first release.
It includes all the essential features for image comparison.

• Parallel zooming UI is for ease of visual comparison
• 'Image diff' indicates different parts between two images
• Metrics such as PSNR provides numerical measure of image quality
• Histogram, waveform and vectorscope give more detail