Originally Posted by krasmuzik
You cannot make blanket assumptions. What primaries does the display use with an RGB input - REC709 (same as sRGB)? Or does it use uncorrected native primaries? Or does it send RGB through a video codec to add back in video controls - and now it is REC601 and SMPTE-C?
OK, fair comment. I am just testing thoughts/ideas in relation to calibrating a source/display/screen in an industry that appears to be quite anarchic in its implementations. I have no idea of what primaries the pj uses with an RGB input. What should "normally" be expected?
I am using an upsampling SD dvd player (Bravo D1) that may or may not apply rec 709 when outputting YCbCr 720p and 1080i signals. I am even more confused as to the primaries it uses when it outputs an RGB 720p or 1080i signal through DVI. Then, I have an HD capable dlp pj (Optoma HD7100) that I assume applies rec 601 to SD signals and rec 709 to HD signals. Thanks God, the screen is passive although it has a gray tint to it and it is retroreflective (Optoma Graywolf II).
For calibration I have the Optix Monaco colorimeter, HCFR, S&V and THX calibrating dvds and HCFR software.
If you were called to professionally calibrate this chain when using a DVI 720p at 48Hz and "native" mode with no scaling done by the projector, what factors do you know apply to the chain, what would you do and what assumptions would you be making? Would you calibrate it to rec 601. 709, other? Would you try to bring RGBYCM to the CIE? Would you want to get RGBYCM values right as a percentage of the white Y value? What would you rather have, a flat gamma log line or maximize the dynamic range yet preserve as pure whites as possible?
When using DVI, the pj offers a CMS with RGBYCM lightness, saturation and tint, adjustable gamma values by 500k, adjustable colour temperature by 500K with x,y adjustment, RGBYCM gains and offsets, sharpness, contrast and brightness.
Kras, zoyd, Tom, others, please??