However, what's really surprising is that the GH4 looks to pull a slightly better key than either of the BMCC examples, despite the fact that the 8-bit codec should be struggling around the edges of that afro. Right off the bat, it's clear that the GH4 holds an advantage in terms of overall image detail, which should come as no surprise considering that it almost holds up to the EPIC (just in terms of detail). With that in mind, here's the test from Video Alchemy. Based on this alone, it would be safe to assume that the BMCC would outperform the GH4, even despite the fact that it's not a 4K camera. Taking the GH4's 8-bit 4:2:0 4K output and running it up against the 1080p ProRes 4:2:2 and the 2.5K CinemaDNG from the Blackmagic Cinema Camera seems like a bit of a mismatch, especially considering that the BMCC is an incredibly sharp camera in its own right, but with far superior codecs. The results are surprising, to say the least.īefore we get to the comparison video, we should talk about what the expectations would be for a test of this nature. The fine folks at Video Alchemy performed one such test recently, and ran the GH4 up against the BMCC's ProRes and CinemaDNG. However, seeing as the GH4 keeps blowing past people's expectations, it was only a matter of time before we started to see green screen comparisons to cameras with better internal codecs. Anybody who has ever had the opportunity to shoot green screens both with DSLRs and higher quality cameras with more robust codecs can attest to the fact that it's significantly easier to pull a key from the latter. Common knowledge tells us that codec and compression are two of the most important factors (after lighting, of course) when it comes to green screen work and being able to pull a quality key from your source footage.
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