Great link! I can use that rgb2yuv program, but how to create 16bit SGI files? Even so, I still can't create YUV directly (but should be enough for 10bit yuv). If there's an output plugin for povray, that's pretty easy to script in. Update2: yep, povray can create 16bit linear rgb in PNG and PPM. With some conversions I could finally get 10bit yuv, what a pain though. How do you know it's a "valid" 10bit source? The answer is you don't know unless you have something like a gradient to look at. are less useful for this testing, because there are no gradients - they show discrete solid uniform colors (ie. already quantized, so 8bit will look the same as 10bit). Not all cameras output a 10bit signal through HDMI or HD-SDI (many are actually output 8bit even though the A/D signal processing upstream may be higher) While you can get gradients in live footage (like skies, shadows), it's easier to see with computer generated ramps, and you can more easily start with higher precision (like a 16 or 32bit RGB format).
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