lovell/sharp

Enhancement: expose vips_relational operation

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#1,015 创建于 2017年11月4日

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 (3 评论) (0 反应) (0 负责人)JavaScript (31,994 star) (1,389 fork)batch import
enhancementhelp wanted

描述

I want to process my images such that only pixels that are a given color (eg: RGB(0,0,100)) will appear in the final image as black, the rest should be white.

Is there any way to add a custom filter/function that is called for each pixel before it is added to the output?

贡献者指南

技术栈
javascriptnodejsc
领域
backend
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。
4
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
Understanding of libvips libraryFamiliarity with Node.js native addons
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。
20
研究方向
Research the libvips relational operation API and determine which comparisons to support. Then implement a new method in sharp's C++ binding that calls vips relational, expose it in the JavaScript API, and add tests. Review existing similar operations in the codebase for reference.