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CMYK images converted to RGB

See original GitHub issue

Steps to reproduce

Tell us about your environment:

Puppeteer version: 5.3.1
Platform / OS version: macOS 10.15.7
URLs (if applicable):
Node.js version: 12.16.1

What steps will reproduce the problem?

Please include code that reproduces the issue.

// give puppeteer access to file
const express = require('express')
const app = express()
app.use(express.static(__dirname))
app.listen(3000)

// generate pdf
const puppeteer = require('puppeteer')
const html = `
<html>
    <body>
        <img src="http://localhost:3000/Channel_digital_image_CMYK_color.jpg">
    </body>    
</html>`
;(async () => {
    const browser = await puppeteer.launch()
    const page = await browser.newPage()
    await page.setContent(html)
    await page.pdf({ path: 'output.pdf' });
    console.log('done')
})()

Here is the CMYK image I used: https://upload.wikimedia.org/wikipedia/en/2/25/Channel_digital_image_CMYK_color.jpg

What is the expected result? If I extract the image from the resulting pdf, it will remain in CMYK format.

What happens instead? The image is converted to RGB, causing the PDF colors to be wrong when printed.

Issue Analytics

State:
Created 3 years ago
Reactions:2
Comments:8

Top GitHub Comments

2reactions

anrecommented, Nov 30, 2020

At the moment we are pre-calculating the RGB values using the same ICC color profile as our print-service and only use this RGB colors in our application.

Are you generating a pdf with puppeteer and and then running it through Ghostscript afterwards? The image will technically be CMYK, but they will not match the colors of the CMYK image in the initial HTML file.

We also tried Ghostscript but as you say it will not be the same as the original picture and it is very slow.

1reaction

AdamGaskinscommented, Nov 30, 2020

Me too, we also need PDFs with CMYK colors for printing

now I’m using Ghostscript to convert pdf RGB to CMYK for printing

Are you generating a pdf with puppeteer and and then running it through Ghostscript afterwards? The image will technically be CMYK, but they will not match the colors of the CMYK image in the initial HTML file.