Stuck on an issue?

Lightrun Answers was designed to reduce the constant googling that comes with debugging 3rd party libraries. It collects links to all the places you might be looking at while hunting down a tough bug.

And, if you’re still stuck at the end, we’re happy to hop on a call to see how we can help out.

Need to encode to 1-bit BMP

See original GitHub issue

Is your feature request related to a problem? Please describe. I have web service that receives PNG/JPEG and converts them into BMPs. The generated BMP is then requested by a low-powered microcontroller (esp8266) and then displayed in a small B&W 2.7 inch E-Ink display. The microcontroller has some issues with timeouts when image sizes are “large”.

Describe the solution you’d like I would like the option to encode as a 1-bit BMP output. Currently, If I read a 58Kb JPEG image the BMP output (with resizing as well as removing color) comes out as a 143Kb. If I use gimp to convert to 1-bit indexed color the result is 7Kb!

Adding a . bitPP - Bits per pixel option where I can set to 1 to encode will be ideal.

Describe alternatives you’ve considered Here is the code I’m using:

const fs = require('fs');
const Jimp = require('jimp');

test();

async function test() {
    const image = await Jimp.read('lion.jpeg');

    await image
      .contain(264, 176, Jimp.HORIZONTAL_ALIGN_CENTER | Jimp.VERTICAL_ALIGN_MIDDLE)
      .greyscale()
      .contrast(0.8)
      .dither565()
      .deflateStrategy(0)
      .filterType(Jimp.PNG_FILTER_NONE)
      .colorType(0)
      .background(0xFFFFFFFF)
      .rotate(90)
      .writeAsync('lion.bmp');

    const orig = fs.statSync('lion.jpeg');
    const result = fs.statSync('lion.bmp');

    console.log(`${orig.size / 1000.0}kb`, `${result.size / 1000.0}kb`);
}

Additional context lion