AJA Codec gamma problems

[Antoine Fabi]

Hi,

I recently tried the AJA Kona DPXT to QT Translator, because i could not figure how to import DPX image sequence in Color (imported only the first image).

Each time i convert DPX files via this software, i end up with a severe darkening of the image.
The image stay very dark even when i import the clip in Color.Everything is crushed, visually, and on the Wave form monitor.

Is there a way to avoid this gamma shift ?

thanks

Antoine

 

[Mark L. Pederson]

Hi,

I recently tried the AJA Kona DPXT to QT Translator, because i could not figure how to import DPX image sequence in Color (imported only the first image).

Each time i convert DPX files via this software, i end up with a severe darkening of the image.
The image stay very dark even when i import the clip in Color.Everything is crushed, visually, and on the Wave form monitor.

Is there a way to avoid this gamma shift ?

thanks

Antoine

Antoine -

For starters - you can ONLY convert RGB Quicktimes to DPX with the AJA tool. Non RGB codecs will give results like you described.

So, if you have a codec other than AJA RGB Lin or LOG - you gotta convert first. Meaning, transcode to AJA 10 bit RGB LIN - then convert to DPX -

All of this is in the instructions and documentation that comes with the AJA utility.

 

[Antoine Fabi]

Hi Mark,

I'm speaking about the DPX To QT tool.
...not the QT to DPX...

I'll take a look at the instructions.

thanks

Antoine

 

[Antoine Fabi]

Am i alone to have this problem ?

 

[Bert Claes]

hi antoine. in color, there is a setting to override the dpx header settings. check that one and set it to 0-1023.