jimp-dev/jimp

Autocrop not cropping surrounding black area

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#753 opened on Jun 18, 2019

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 (3 comments) (0 reactions) (0 assignees)JavaScript (13,218 stars) (785 forks)batch import
bughelp wantedsolution in issue

Description

Large Black borders should have cropped out. I have adjusted the tolerance and have see no change in results. They are simply not getting cropped.

Latest Node and Jimp on a Raspberry Pi

   Jimp.read( "./scanimage.jpg", (err, img) => {
        if (err) throw err;
        let clean = img
        .scale(0.5)
        .quality(50)
        .autocrop()
        .write('./croppedimage.jpg')

test

Contributor guide

Tech stack
javascriptnodejs
Domain
backend
Issue type
bug
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.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
basic knowledge of Jimp
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
45
Research direction
Investigate the autocrop function in Jimp source code (likely src/image/autocrop.js). Understand how the tolerance parameter is used and why it fails to crop black borders. Look at any existing comments or related issues for clues.