png2lwxl
v0.1.2
Published
png2lwxl is a node.js library to convert png's to a label printer's raw data
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node-png2lwxl
Node version of pbm2lwxl using png as input format. It takes a png as input file and spits out prn-file which can be sent to your label printer.
It is based pbm2lwxl.c written by Mark Whitis
Install
You can install png2lwxl using the Node Package Manager (npm):
npm install png2lwxl
Simple example
var png2lwxl = require('png2lwxl');
var fs = require('fs');
png2lwxl.convert(imgPath, function (err, printData) {
if(err) return console.log(err);
fs.writeFile(__dirname + '/test.prn', printData, function (err) {
if(err) return console.log(err);
console.log("file written");
});
});
Just send the test.prn file to your label printer as raw data.
Label printers can only print black or white, no grayscale, so I used a threshold value when sending color or gray pixels. The thresshold can be set using the blackwhiteThreshold
-option.
If you want to rotate your image 90 degrees, you can set the option landscape
to true:
var png2lwxl = require('png2lwxl');
var fs = require('fs');
var imgPath = __dirname + '/test.png';
png2lwxl.convert(imgPath, {
landscape: true, // rotates image 90 degrees
blackwhiteThreshold: 110 // 0-256: the higher the value, the more pixels will be treated as black
}, function (err, printData) {
if(err) return console.log(err);
console.log(printData);
fs.writeFile(__dirname + '/test.prn', printData, function (err) {
if(err) return console.log(err);
console.log("file written");
});
});