jimp-dev/jimp

Setting lower quality increases the file size

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#1,018 创建于 2021年6月2日

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 (0 评论) (0 反应) (0 负责人)JavaScript (13,218 star) (785 fork)batch import
bugfile size issuehelp wanted

描述

Expected Behavior

Decrease the file size with decrement in image quality.

Current Behavior

Increase the file size with decrement in image quality.

Code

jimp.read("./forest-patrol.jpg", (err, lenna) => {
  if (err) throw err;
  lenna
    .quality(60) // set JPEG quality
    .write("./forest-patrol-jimp-mini.jpg"); // save
});

bug-report Here, we can see that original image forest-patrol.jpg is smaller than the processed image forest-patrol-jimp.jpg

贡献者指南

技术栈
javascriptnodejs
领域
backend
议题类型
bug
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。
1-3 hours
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。
clear
前置要求
Node.jsJimp APIBasic understanding of JPEG compression
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。
60
研究方向
Investigate why setting a lower JPEG quality (e.g., 60) results in a larger file size than the original. Start by examining the `quality` method in Jimp's JPEG plugin (likely in `/packages/plugin jpeg/src/index.js`). Check if the quality parameter is passed correctly to the underlying JPEG encoder. Compare the encoded buffer sizes at different quality levels. Look for any existing issues or PRs related to JPEG compression in the repository.