GoogleChromeLabs/squoosh

Reduce palette - alpha only

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#819 创建于 2020年9月5日

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 (9 评论) (0 反应) (0 负责人)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.

贡献者指南

技术栈
typescriptweb components
领域
frontendtooling
议题类型
feature
难度面向新贡献者的预计实现难度，1 表示很小改动，5 表示专家级工作。
3
预计时间有经验贡献者完成调查、实现、测试并准备 pull request 的粗略时间范围。
1-2 days
活动状态议题当前的可参与程度：新鲜、活跃、陈旧、阻塞或等待维护者输入。
stale
清晰度议题是否清楚说明期望改动、验收标准和下一步。
mostly clear
前置要求
TypeScriptimage processing concepts
新手友好度1-100 的估计分数，表示该议题对首次贡献者的友好程度。
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.