lovell/sharp

Enhancement: expose vips_relational operation

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#1,015 建立於 2017年11月4日

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 (3 留言) (0 反應) (0 負責人)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?

貢獻者指南

技術棧
javascriptnodejsc
領域
backend
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。
4
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
Understanding of libvips libraryFamiliarity with Node.js native addons
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。
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.