js-lcms v0.1.4
js-lcms
js-lcms is a fork of lcms.js, a low-level binding to LittleCMS based on emscripten.
Example Usage
The example below shows how to convert an RGB array from an sRGB profile to another sRGB profile:
import {
INTENT_RELATIVE_COLORIMETRIC,
cmsCreate_sRGBProfile,
cmsFormatterForColorspaceOfProfile,
cmsCreateTransform,
cmsDoTransform,
cmsDeleteTransform,
cmsCloseProfile,
} from "js-lcms";
const inputProfile = cmsCreate_sRGBProfile();
const outputProfile = cmsCreate_sRGBProfile();
const isFloat = 0; // false
const inputFormat = cmsFormatterForColorspaceOfProfile(
inputProfile,
isFloat ? 0 : 2,
isFloat
);
const outputFormat = cmsFormatterForColorspaceOfProfile(
outputProfile,
isFloat ? 0 : 2,
isFloat
);
const transform = cmsCreateTransform(
profile,
inputFormat,
profile,
outputFormat,
INTENT_RELATIVE_COLORIMETRIC,
0
);
const image = Uint8Array.from([0, 127, 255]);
console.log(cmsDoTransform(transform, image, image.length / 3));
cmsDeleteTransform(transform);
cmsCloseProfile(inputProfile);
cmsCloseProfile(outputProfile);Web Demo
A print-to-console web demo can be found in the ./demo directory. Run npm run demo to build it and start a local server.
Other Examples and Resources
LCMS.js color conversion demo by @yoya:
LittleCMS 2.12 documentation:
- https://www.littlecms.com/LittleCMS2.12%20tutorial.pdf
- https://www.littlecms.com/LittleCMS2.12%20API.pdf
Developing
Make sure you have git and emscripten installed on your system.
js-lcms works by building LittleCMS to JavaScript with emscripten and directly appending another file that exports the public API.
LittleCMS should be present in the root directory as ./Little-CMS. You can clone this repository with --recurse-submodules or clone LittleCMS directly.
Finally, run the build script with npm run build. The build script is a NodeJS script in scripts/build-package.js. You can check if the build works by running the previous demo right after.
Acknowledgements
js-lcms is based on the following libraries: