# README

Go Image Coding

Go (bindings for) image en-/de-coding using libraries found on debian and other common systems. Go comes with image processing built-in, written in go, but often they can't quite match the performance of established image processing libraries such as jpeg-turbo etc.

While general purpose, this project is opinionated and tailor to our needs.

Install (debian)

See Dockerfile

Install (OS X)

brew install jpeg-turbo libpng libheif webp pkg-config

HEIF/HEIC

This package optionally supports heif, to include heif; add -tags heif to your gobuild. It's enabled by default on darwin (macOS).

# Functions

ConfigHeif

No description provided by the author

DecodeConfig

DecodeConfig is like image.DecodeConfig but supports additional formats For JPEGs it uses jpeg-turbos internal function for compatibility.

DefaultScale

Calculcate at what scale to use for OCR optimized pages We prefer maximum what would be the equivalent for a A4 page at 150 ppi.

EncodeWebP

No description provided by the author

FixOrientation

FixOrientation uses the imaging library to correct for orientation.

GetOrientation

GetOrientation returns the image orientation from EXIF data https://www.daveperrett.com/articles/2012/07/28/exif-orientation-handling-is-a-ghetto/ TopLeft 1: 0 degrees – the correct orientation, no adjustment is required.

NewRGBImage

NewRGBImage allocates and returns RGB image.

Transform

Transform scales, colormaps and orients an image according to input param.

TransformHeif

No description provided by the author