Sharp: jpeg output is not compatible with some software

[weijarz]

I found jpeg images generated by sharp are not compatible with some software.

The file command output of sharp generated image is different from images generated by other image lib (jimp/gimp/PIL etc), there is no JFIF standard 1.01, aspect ratio, density 1x1 prefix.

$ file other.jpg sharp.jpg 
sharp.jpg: JPEG image data, baseline, precision 8, 1080x565, frames 3
jimp.jpg: JPEG image data, JFIF standard 1.01, aspect ratio, density 1x1, segment length 16, baseline, precision 8, 800x391, frames 3

// "sharp": "^0.17.1"
export default async function compressImage(data) {
    const destData = await sharp(data)
        .limitInputPixels(MAX_PIXELS)
        .resize(MAX_WIDTH, MAX_HEIGHT)
        .background('white')
        .max()
        .withoutEnlargement()
        .flatten()
        .jpeg({quality: 65})
        .toBuffer()
    return await destData
}

[lovell]

Hello, the JFIF standard (rather than the JPEG standard) requires a mandatory APP0 metadata chunk. Adding withMetadata should do this.

Are you able to provide an example of "some software" that can't handle APP0-less JPEG?

[weijarz]

@lovell Thank you, it works now.

Amazon Kindle (E-Ink version)'s builtin .mobi viewer (in periodical mode) does not show images without metadata.