lovell/sharp

Enhancement: expose vips_relational operation

Open

#1,015 opened on Nov 4, 2017

View on GitHub
 (3 comments) (0 reactions) (0 assignees)JavaScript (1,389 forks)batch import
enhancementhelp wanted

Repository metrics

Stars
 (31,994 stars)
PR merge metrics
 (Avg merge 4d 19h) (18 merged PRs in 30d)

Description

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?

Contributor guide

Research direction
Examine how sharp currently binds libvips operations; look at existing similar operations like vips relational in libvips API; implement a new binding in the source code.
Tech stack
javascriptnodejsc
Domain
backend
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Mostly clear
Prerequisites
JavaScriptNode.jsGit
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
50