Using the 1-255 range sets blacks to level 1 and level 1 to RGB value of 2. Tweaking brightness values never helps with this. I guess I should stick to using madTPG to calibrate my display with HCFR given these results? I've decided to use a custom 1-255 output range as it turns out that level 0 and level 1 are virtually identically displayed on the TV and results in level 1 essentially getting clipped out. So it seems that for whatever reason, AVS709 mp4 file is producing the wrong output as I believe that 102,102,102 should be the expected output for 40% gray windows. This came out to 102,102,102 RGB for the madTPG window, but 101,101,101 for the AVS709 40% Gray window pattern displayed via MPC-HC and madVR. So I used Filter->Blur->Average to get an average color for a selection within the 40IRE window. In Photoshop, I noticed that there is some dithering in the colors for what should be uniform shade of grey. I took screenshots and saved PNG files and then opened them up in Photoshop.Ģ. In both cases, output range was set to 0-255 in madVR settings for the TV. Displayed 40% Gray patterns using madTPG and the corresponding mp4 file via MPC-HC and madVR. After further investigations, it appears that the AVS709 mp4 files are the culprit. If this is indeed the source of discrepancy, what would be the best way to go about calibrating? Should I stick to relying on madTPG results and would those be more in line with what I will see when using madVR+MPC-HC to playback bluray rips?Ĭlick to expand.Thanks Graeme! That was a great suggestion and I don't know why I didn't think to try that right away. I do see your point though that madTPG may be determining slightly different level for a given IRE pattern compared to what is encoded in AVS 709 mp4 files. I was hoping that since madTPG seemed to be using the same madVR settings as in MPC-HC, that the decoding pipeline would be the same resulting in the same measurements. My understanding was that if the source is a DVD/BluRay with 16-235 levels, and if we were to then use madVR + MPC-HC to display this content on a TV that accepts 0-255, then the madVR settings would determine whether to use dithering or not, and how to round/truncate levels. I'm a bit ignorant when it comes to how files are encoded.are you saying that a file specifies whether dithering is to be applied to display a given level? However, the luminance tracking gets thrown off (thus the gamma is off) between my results from madTPG and manually playing AVS 709 mp4 files in MPC-HC via madVR.Ĭould anyone explain to me why this would be the case and what my options for calibration are? Am I relegated to calibrating the painful and tedious way of manually calling up each relevant mp4 file from AVS HD 709 files?Ĭlick to expand.Hi madshi, thanks for taking the time to reply and for all your awesome work on madVR. Keep in mind.the grayscale is still neutral and maintains very low dE values. However, when I played the mp4 files in MPC-HC, and tried to verify the grayscale.the results were again off from those obtained using madTPG. I obtained a near perfect calibration to BT.1886 using madTPG and thought that this was the holy grail for me (since I play all video content via MPC-HC). I got that working via HCFR and it seems that madTPG uses the same madVR settings as madVR in MPC-HC. I then decided that I could fix this by using madTPG. However, when I tried to verify the grayscale by playing the AVS 709 mp4 files via MPC-HC and MadVR, the results from 11 point grayscale measurements did not match those I obtained using the HCFR internal generator (Quite a big difference in avg gamma and gamma tracking). Initially, I calibrated using the HCFR internal pattern generator (view images) and got a great looking calibration. I'm having a bit of a tough time trying to figure out how to calibrate my TV that is hooked up to my HTPC (Intel HD4000 GPU). Discrepancy between MadVR TPG and AVS 709 calibration
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