-
GAMMA SHIFT w/ BM Codecs from MAC 2 PC
I’m trying to do cross platform AE work, but I’m seeing serious gamma shifts. I’m capturing my back plates and footage on a mac w/ Final Cut Pro to the Blackmagic 10-bit codec and doing all of my effects in After Effects on a PC.
The problem I’m having is that the PC puts a gamma shift on the Blackmagic footage so that when I render it out it’s much darker then when I originally captured it. This gamma shift happens immediately. When I import the footage it is automatically darker.
When I bring the same footage (same AE project) onto a mac the gamma shift does NOT happen. In fact, to test it I made an animation movie from my Blackmagic movie and put both of them into After Effects. First on a Mac then on a PC.
On the Mac there was ZERO difference (I applied a difference mode and it was solid black). On a PC there is a very noticable difference, with the Blackmagic movie coming in much darker.
I called BM support about this a several days ago and they said they’d email or call me back. Haven’t heard since then so I thought I’d post on here and see if anybody is seeing the same thing as me.
Is it true that you cannot use the BM codecs for cross platform work?? Is this a QT thing? Do I need to downgrade something? What’s going on?!
I’m on a G5 Mac w/ Final Cut Pro 6.0.1, AE 7, QT 7.2, & BM drivers 6.2 (can’t use 6.3 – 6.4 cause of HD downgrading bug).
The PC also has AE 7.
Sam
-
5 Replies
-
Hey Sam – I have always had gamma shifts when moving FCP created mov’s to Premiere on the PC. I have found it occurs without any BMD intervention and my research has found that it is a common problem. It also seems most people think its an Apple issue.
Baz
-
PC screens use a 2.2 gamma while Mac use 1.8.
Whatever thing that you make in a Mac will look darker in a PC. You need output to an external monitor where the movie will look the same.
Rafael -
This is not a computer monitor issue. The gamma shift shows up on external monitors, and even worse, it is burned onto the image when you render. IE round tripping from FCP Capture, to PC AE FX, back to FCP Edit will result in a shot that is much darker than where you started.
Any other people seeing this? Should I be resigned NOT to use BM 10-bit for cross platform work?! I thought that one of the shining points for Blackmagic was their ability to work cross platform….. what’s happening here?? Any workarounds?
Sam
-
Hello.
We also see this thing. The workaround for us has been to export from mac as AVI files instead of Quicktime or to layout to digibeta. We see this on all Quicktime files not only bm quicktimes. I don -
Black Magic Please Respond!! This has been an ongoing issue for me to.!! I’m simply capturing on a mac with a decklink card HD/SD and moving the file to our PC Render farm (Rhozet) and I have to fight to get proper gamma out..
d
you cant hear my inner voice scream… can you..?
Reply to this Discussion! Login or Sign Up