Black CMYK JEPGs in PDF with MIME data mode

Bug

I want to embed cmyk images in pdf using img.dataMode = Image.MODE_MIME. That should take the image and embed it into pdf without any painting or editing. But all cmyk images are black.

JPG

PDF

Files img.jpg.zip out.pdf

Related issue https://github.com/Automattic/node-canvas/issues/425

Steps to Reproduce

const { createCanvas, Image } = require("canvas")
const { writeFileSync, readFileSync } = require("fs")

const img = new Image()
img.dataMode = Image.MODE_MIME
img.src = readFileSync("img.jpg")

const canvas = createCanvas(200, 200, "pdf")
const ctx = canvas.getContext("2d")
ctx.drawImage(img, 50, 50, 100, 100)
writeFileSync("out.pdf", canvas.toBuffer())

Your Environment

• Version of node-canvas: 2.0.0-alpha.12
• Environment: node 10.1.0, macOS 10.13.5