[Openexr-devel] Writing single EXR file with very many channels?

[Koraxen]

Hey guys,

I have a question regarding how to deal memory consumption and multi-layered EXR files.

I need to write an EXR file that contains 10 different versions of a same high res (5120 x 2880) image. This translates into an EXR file that contains 10 layers x 4 channels = 40 channels.

What I am doing is:
1. Instantiate an exr framebuffer
2. Allocate memory for 40 high-res channels, and insert() them all into framebuffer
3. Instantiate OutputFile object, and set the framebuffer to it
4. Write the OutputFile

The problem is that host system obviously runs out of memory during step #2.

What's needed here is the ability to:
- Insert a channel to framebuffer
- Write it to disk
- Free memory
- Repeat 40 times
- End up with a *single* EXR file containing 40 channels

How can this be done?

Thanks a ton!
- Kora