Edgingo

Edgingo is a Go library for detecting and removing solid-colored edges/borders from images. It supports removing edges from all sides, vertical edges only, horizontal edges only, or individual sides.

Features

• Remove edges from all sides of an image
• Remove only vertical edges (top/bottom)
• Remove only horizontal edges (left/right)
• Remove edges from specific sides
• Aggressive mode that uses a 10% threshold for edge detection
• Preserves image quality by working with RGBA images

Installation

go get github.com/coalaura/edgingo

Usage

As a Library

import "github.com/coalaura/edgingo"

// Load your image
img, _ := png.Decode(file)

// Convert to RGBA if needed
rgba := edgingo.AsRGBA(img)

// Remove all edges
result := edgingo.RemoveAllEdges(rgba, false)

// Remove only vertical edges
result = edgingo.RemoveVerticalEdges(rgba, false)

// Remove only horizontal edges
result = edgingo.RemoveHorizontalEdges(rgba, false)

// Remove specific edge
result = edgingo.RemoveEdge(rgba, edgingo.SideTop, false)

// Use aggressive mode (10% threshold)
result = edgingo.RemoveAllEdges(rgba, true)

The second parameter aggressive determines whether to use a 10% threshold when detecting edges. When true, it will ignore checking the middle 80% of pixels along each edge.

Command Line Tool

The library includes a command-line tool that can process images directly. It supports PNG, JPEG, and WebP formats.

Installation:

go install github.com/coalaura/edgingo/cmd

Usage:

edgingo <input-image> <output-image>

The CLI tool automatically:

• Uses aggressive mode for better edge detection
• Detects the output format based on file extension (.png, .jpg/.jpeg, or .webp)
• Preserves quality (90% for JPEG, lossless for WebP)

Example:

edgingo input.png output.png

Example

Example of removing all edges from an image with aggressive mode enabled.

Before	After

License

See the LICENSE file for details.