Automattic/node-canvas
Wrong Image ColorSpace in PDF for JPEG with ICC
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#1.621 geöffnet am 16.07.2020
BugHelp wantedImages & Formats: JPEG
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Beschreibung
Issue
If you create a PDF file, JPEG images with ICC profile are saved in the wrong color space.
Steps to Reproduce
With a JPEG image with an embedded ICC profile:
const fs = require('fs')
const { Image, createCanvas } = require('canvas')
const canvas = createCanvas(100, 100, 'pdf')
const image = new Image()
image.dataMode = Image.MODE_MIME | Image.MODE_IMAGE
image.onload = () => {
canvas.width = image.width
canvas.height = image.height
const ctx = canvas.getContext('2d')
ctx.drawImage(image, 0, 0, image.width, image.height)
fs.writeFileSync('out.pdf', canvas.toBuffer())
}
image.src = 'image-with-icc-profile.jpg'
This embeds the JPEG image (with embedded ICC profile) unchanged in the PDF and sets its color space to DeviceRGB. This means that the ICC profile is not applied to the image.
The correct behavior would be to save the ICC profile as a further stream in the PDF and to reference it as ICCBased color space.
Environment
- node-canvas 2.6.1
- node 12.18.2 on Ubuntu 18.04.4