Ungraded reference prints without creative intervention — quality control material before final color grade. Baseline for comparing color and image stability.
Before the first color correction runs, you need a clean reference – that's exactly where hygiene prints come into play. You have a copy made on which no color grading, contrast adjustments, or artistic manipulations have been performed. This is your baseline, your neutral state of the material. On set, the exposure wasn't perfect, of course – shadows too deep, highlights blown out – but the hygiene print shows you exactly what the sensor or the film stock recorded, without downstream manipulation.
You use this material for several critical tasks: Firstly, image control. You can use it to check if focus, motion blur, and depth of field are as planned in the original. Secondly, color measurement. Your colorist compares the hygiene print with the final DCP or the final master and can thus understand how far the color correction deviates from the source material – an important sanity check. Thirdly, quality assurance at the level of grain, noise, and technical errors that only become visible after grading.
In practice, you often arrange these copies as a separate reel – either parallel sequences or a separate roll that you give to the lab to avoid confusion. Especially with digital workflows, this has sometimes become redundant because you can always go back to the DNG original. But with traditional negative scanning and in cinema DCP production, the hygiene print remains a reliable tool. It is what stands between the raw material and the artistic decision – neutral, non-negotiable, unalterable.
Important: This is not working or editing material. The edit runs in parallel; the hygiene print is strictly reserved for technical control. Some teams also create it only after the color correction to compare the finished result against the original – a kind of digital proof before the print run.