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Bad JPEG levels in 32-bit mode
Is this a known bug? I put a JPEG test card on the timeline and found that while the levels are correct in 8-bit mode, Vegas crushes the black end in either 32-bit mode. If I convert the graphic to a PSD, the problem goes away.
Here’s what it looks like in 8-bit. Levels as expected:
And in 32-bit video or full-range. Black is crushed:
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7 Replies
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Hi;
You beat me to this test.
Very interesting, I’ll see if I can duplicate it tonight.
For years I used 32-bit floating point in my projects, only recently “relaxed” and went back to 8-bit.
Steve
Win7 Pro X64 on Dell T7500, MultiTB SATA, 8GB RAM, nVidia Quadro 2000, Vegas 12, 11, 10, 9 DVDA 6.0 & 5.2(build 135) Sony HDR-CX550V, Panasonic GH3 with LUMIX G X VARIO 12-35mm / F2.8 ASPH, LUMIX G X VARIO 35-100mm / F2.8
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Where is your finished video destined for using
32bit floating point?Steve Rhoden
(Cow Leader)
Film Editor & Compositor.
Filmex Creative Media.
https://www.facebook.com/FilmexCreativeMedia
1-876-461-9019 -
OK, I completed the 1st render & upload using the https://www.schuch.net B&W test pattern.
youtube.com/watch?v=oOCgMUQBpW4
The 1st 30 sec of the video has the Sony Computer RGB to Studio RGB level applied. The last 30 sec has no levels applied. When using the RGB parade scope, I see exactly what I would expect – with the levels FX applied, the scope shows everything between 16 and 235:
With no Levels FX, the values stretch to 0-255:
But when viewing the final product from YT, it looks different from both my preview in Vegas and the preview in the 2nd monitor. Not sure what to think, comments welcome.
The test patten made me realize that my monitors on the new computer are not calibrated – I can drag the image from one to another and it looks different! ;p .
Gotta go to bed …
Steve
Win7 Pro X64 on Dell T7500, MultiTB SATA, 8GB RAM, nVidia Quadro 2000, Vegas 12, 11, 10, 9 DVDA 6.0 & 5.2(build 135) Sony HDR-CX550V, Panasonic GH3 with LUMIX G X VARIO 12-35mm / F2.8 ASPH, LUMIX G X VARIO 35-100mm / F2.8
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Stephen please make some conclusions from your detailed work?
I find this type of analysis – Levels<>8-bit v 32-bit<> Crushing – is truly head-banging.
WAKE-UP!!!
Cheers
Grazie
Video Content Creator and Potter
PC 7 64-bit 16gb * Intel® Core™i7-2600k Quad Core 3.40GHz * 2GB NVIDIA GEFORCE GTX 560 Ti
Cameras: Canon XF300 + PowerShot SX50HS Bridge -
When its all said and done, a properly calibrated broadcast
monitor is what these tests are supposed to be done on.Steve Rhoden
(Cow Leader)
Film Editor & Compositor.
Filmex Creative Media.
https://www.facebook.com/FilmexCreativeMedia
1-876-461-9019 -
I appreciate the research. But my original question remains. The test card JPEG looks fine in Photoshop. But it’s crushed at the black end in Vegas with no filters applied. It looks crushed, it scopes crushed, and it renders crushed to an MP4. A PSD copy has no such problem. I must conclude there is a problem with Vegas’ JPEG plugin.
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Vegas has always had a bit of an issue with displaying images slightly
darker than its original, its more than a jpeg plugin issue.Steve Rhoden
(Cow Leader)
Film Editor & Compositor.
Filmex Creative Media.
https://www.facebook.com/FilmexCreativeMedia
1-876-461-9019
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