Performs color transformations on bitmap images using node buffers. Currently
supports Windows and OS/2 .bmp files with header types of BM and BA.
Available transforms are an rgb diff in the form of (30,-20,50) and color
inversion. Support for more transforms like greyscale are planned.
Perform an rgb transform on a file named test.bmp and output to transformed.bmp:
bmptransform test.bmp "-t=(40,12,-60)" -o=transformed.bmp
Perform a color inversion on toinvert.bmp:
bmptransform toinvert.bmp -t=invert -o=inverted.bmp
If no output location is specified it will write file named transformed.bmp to your current working directory.
buffer is the bitmap as read from disk and transform can either be a string ('invert') or an object of rgb diffs ({r: 30, g: -40, b: 60}).
Output is a new, transformed buffer. The original is not mutated.
const fs = require('fs');
const bitmapTransformer = require('bmp-transform');
fs.readFile('test.bmp', (err, data) => {
if (err) return console.log(err);
const transformed = bitmapTransformer(data);
fs.writeFile('output.bmp', transformed, err => return console.log(err));
});Bitmaps with color depth other than 24 bit or alpha channels are not correctly processed.
This software is licensed under the terms of the MIT license.