From the review of #1491: patching a component's sampling in the header of a baseline JPEG
`image` wrote leaves its entropy data for 1 × 1 components, so decoding it could only fail and
the test proved nothing past the frame not being refused. The fixture is now a baseline CMYK
JPEG as jpeg-encoder writes it with 2 × 2 sampling (its black sampled finer than its cyan), and
the test asserts it is left to the decoder and decodes.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>