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One of the main differences are that it always automatically includes Z and ZBack channels for depth information (see the Interpreting Deep Pixels white-paper from ILM for more details on these) and these two channels are always stored as the full float type regardless of the choice of type made for the other channels. The default type may be set using the /display/deepexr/type line in rendermn.ini. Also, the choice of compression methods is limited to none, rle, and zips. The default for this can be set in the /display/deepexr/type line in rendermn.ini. If not set there, it defaults to zips. Finally, noted that the default storage type for the deepexr driver is tiled rather than scanline like the default in the shallow openexr driver.
You can use the render option for deepshadowerror to control the merging of samples where larger values merge more samples but may introduce precision errors in compositing.
Other drivers
- targa – writes a Truevision, Inc. file of type 2, which is an uncompressed RGB or RGBA image.
- png - writes a PNG file with transparency, RGBA format often used on the web
- texture – produces an output file that will be accepted directly by the renderer for use in a texture node.