GoogleChromeLabs/squoosh

Reduce palette - alpha only

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#819 建立於 2020年9月5日

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 (9 留言) (0 反應) (0 負責人)TypeScript (20,335 star) (1,431 fork)batch import
good first issuehelp wanted

描述

WebP and JPEG-XL encode alpha data 'losslessly'. I'm not 100% sure with JPEG-XL, but WebP's compression benefits from palette reduction.

It'd be good to add a toggle to palette reduction that makes it only act on the alpha channel of the image.

貢獻者指南

技術棧
typescriptweb components
領域
frontendtooling
議題類型
feature
難度面向新貢獻者的預計實作難度，1 表示很小改動，5 表示專家級工作。
3
預計時間有經驗貢獻者完成調查、實作、測試並準備 pull request 的粗略時間範圍。
1-2 days
活動狀態議題目前的可參與程度：新鮮、活躍、陳舊、阻塞或等待維護者輸入。
stale
清晰度議題是否清楚說明預期改動、驗收標準和下一步。
mostly clear
前置要求
TypeScriptimage processing concepts
新手友善度1-100 的估計分數，表示該議題對首次貢獻者的友善程度。
40
研究方向
Start by examining the existing palette reduction implementation, likely in the Squoosh codebase under 'src/features/processors/palette reduction.ts' or similar. Understand how the current reduction works on RGBA channels, then design a toggle to restrict reduction to the alpha channel only. Review comments in issue #819 for any previous suggestions or considerations. The implementation should involve adding a checkbox or switch in the UI and passing a flag to the processing logic.
Reduce palette - alpha only · GoogleChromeLabs/squoosh#819 | Good First Issue