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Brightness/Contrast increase on render
Hello,
I’ve been having a problem recently that I now believe is a fault of the render process: using Vegas 9e, rendering to a .m2ts ends up with videos that have blown-out whites, as if the brightness/contrast has been raised a good 20-30%.
Originally, I thought it was the TVs I’ve been playing back on but given I’ve shot on different cameras; cut on two or three different systems; rendered SD and HD; and played back via DVD and PS3 on different SD/HD TVs/monitors; a side-by-side comparison ostensibly reveals the render is to blame.
There’s nothing in the project settings that stands out as the culprit, and although I’m doing a lot of post (colour correction, FX, etc) the render should be near-as-dammit identical to the preview.
I’d rather not put on an arbitrary curve to counteract the effect. Has anyone experienced this before?
Thanks in advance.
NR.
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7 Replies
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Nobody?
I’m having to reduce my gamma to approx 0.7 using a colour corrector on the o/p video bus in order to retain the correct brightness/contrast. A side-by-side comparison of the original in Vegas and the render shows it’s definitely at fault.
Ta.
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BUMP!
I am also having the same issue.. anyone know what’s going on?
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I did some research and discovered there’s no specific ‘cure’. Instead, it seems a case of making sure Vegas’ video levels are ‘correct’ for your rushes, and that your monitor colour profile matches Vegas’ preview window video driver.
Having implemented the advice below, I’ve managed to get a dry clip to render and look near-identical to the preview, so I think new renders should be closer to the original footage, provided MBL doesn’t screw things up.
In the meantime, if anyone knows more or has better results with other ‘fixes’, please, let me/us know.
Anyway, read this (both parts):
a href="https://www.sundancemediagroup.com/articles/glennchan/levels_in_sony_vegas_part_one.htm"></a>Now read this (can’t remember where I got it):
When you view the video in a player like VLC, MPC or Windows Media Player, it’s probably being rendered using the video card’s overlay feature (or by video card acceleration) and it does not get affected by the desktop gamma/color settings. Some video card drivers have separate color controls for video, and some players have their own controls. In addition, some drivers and/or media players try to convert TV levels to PC levels (or vice versa) for viewing on a PC, so the video may appear darker or more contrasty. You can simulate this in Vegas by putting the Levels effect in the video output FX and selecting the “Studio RGB to Computer RGB” preset.
Do this:
Go to: Options -> Preferences -> Preview Device -> Turn On the “Use color management” -> Select the needed profile from the “Monitor color profile”.
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I’ve been having the same issue, however, I managed to find a workaround. Try using 32bit full range video levels in project properties (default setting is 8-bit). That made the output and preview look identical, at least for me.
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Thanks.
I have tried that before but found it caused Vegas to crash. I’ll try it again on an untreated clip and see what happens to the render.
Ta,
NR.
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Tried it out and my version of 9e crashes on any 32Bit render. D/L the 10c trial and it renders but the output is still blown out. Here’s the summary:
Five separate machines (desktops/laptops)
Vegas Pro 7-10 (32 & 64Bit)
Win XP Home/Pro (32bit) / Win 7 (32 & 64Bit)
8bit and 32Bit projects (Video and Full range)
Various file formats (AVCHD/AVI/MOV/DV – SD/HD) Some raw, some transcoded
Various render formats (AVI, MP4, QT, WMV, MPEG2, M2TS)
Various media players (WMP/VLC/QT)Every single render comes out with increased levels. The easiest way to explain it is the difference between 32Bit Video Levels and 32Bit Full Range. Pick any scene with some highlights and the switch totally blows out the whites.
I’ve tried matching monitor profiles for colour mamagement, and constraining the levels with Level/Broadcast Colours. No dice.
This has been going on for years. It’s not a coincidence, given the variation in the projects I’ve worked on. If anyone thinks they can spot what I’m doing wrong, I’m happy to post a detailed workflow.
Cheers,
NR.
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Vegas 15 has Finally fixed these issues with the new ACES 1.0 support. To render perfect colors for video AND stills you must ensure the following project project properties are as followed.
https://imghost.io/image/GS3sB
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