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Capture One 20: Export to JPEG (Phase One IQ4)
Related: 2019 iMac 5K, 2019 MacBook Pro, 4K and 5K display, AMD Radeon GPU, AMD Radeon Pro Vega 48, CPU cores, GPU, iMac, iMac 5K, laptop, MacBook, MacBook Pro, Macs, Phase One, Phase One Capture One, Phase One digital backs, Phase One IQ4 digital back, Photoshop
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This test is about exporting to JPEG from Capture One 20, a very common production task. Exporting to TIF would be a bit slower, due to much greater I/O demands (about a gigabyte per file), and should therefore be done using a very fast SSD when performance is a concern.
Results: Raw file conversion to JPEG — 150-megapixel Phase One IQ4 Raw
Processing lossless-compressed raw Phase One IQ4 raw files is presumably single-threaded for the decompression phase, which would account for the use of 2-3 CPU cores during this test. Everything else appears to done by the GPU when using Capture One 20. That’s good, but what is not so good is that 5 to 6 of 8 CPU cores are idle the entire time. Ideally Capture One would use both the CPU cores and the GPU.