Comment 24 for bug 1476705

Gimp is also, for now, limited to srgb, so anything coming from gimp will work fine with cairo.

And, for a postscript printer, jpegs should be converted directly to ps, not via pdf, so that wouldn't matter either.

But if you used a workflow which used, say, AdobeRGB as the colour working space, and published to pdf, then you would want to avoid cairo.

Or if you used a workflow which ends up with a CMYK pdf.

But if everything you do is in sRGB or grayscale, then pdftocairo is fine for you.