Loader.md

Loader Class

Introduction

A VERY BASIC class used for managing and loading color profiles the application. It provides methods to queue profiles for loading and to load all queued profiles or to load a profile on demand.

Methods

add(url, key, preload)

This method is used to add a profile to the loading queue. It takes three parameters:

• url: The URL or path of the profile to be loaded.
• key: Unique ID of the profile. This is used to retrieve the profile from the cache.
• preload: Profile will be downloaded when using loadAll

async loadAll()

This method is used to load all profiles that have been added to the queue. It doesn't take any parameters and returns a promise that resolves when all profiles have been loaded.

async get(key)

This method is used to get a profile from the cache or download the profile if not already loaded.

findByKey(key)

Returns the profile with the given key or false if not found.

findByURL(url)

Returns the profile with the given url or false if not found.

Usage

    let loader = new Loader();

    loader.add('*lab', 'Lab',  true);
    loader.add('./profiles/srgb.icc', 'sRGB',  false);
    loader.add('./profiles/cmykPrinter.icc', 'CMYK',  false);
    
    await loader.loadAll();
    
    // Get the profiles, Loaded on demand
    let labProfile = await loader.get('Lab');
    let CMYKProfile = await loader.get('CMYK');
    
    if(labProfile.loaded && CMYKProfile.loaded) {
      // Create a transform
      var transform = new Transform();
      transform.create('*lab', CMYKProfile, eIntent.perceptual);
      
      var lab = color.Lab(80.1, -22.3, 35.1);
      
      // convert the Lab color to CMYK
      let cmyk = transform.transform(lab);
      
      console.log(`CMYK: ${cmyk.C}, ${cmyk.M}, ${cmyk.Y}, ${cmyk.K}`);
    }