The Output tab gives access to output driver settings: 

 

Overscan

Overscan extends the render region beyond the regular image coordinates. It can be either a percentage or a pixel value. You can mix % and pixel values at the same time, however, if you don't specify the unit it will default to pixels. It can have:

  • One value such as 10px to specify an equal margin on every side.
  • Two values, such as 10px 5px, to specify the top/bottom (first value) and right/left (second value) margin.
  • Three values, such as 10px 5px 2px, to specify the top (first value), right/left (second value) and bottom (third value) margin.
  • Four values, such as 10px 5px 2px 1px to specify the top, right, bottom, and left margins respectively.

E.g. a ten-pixel overscan for a 640x480 image in all directions can be achieved with options region_min_x, region_min_y, region_max_x, region_max_y of -10, -10,649, 489. The example below shows a pixel value of 10, 50, 100, 200 (top, right, bottom, left) in the 'Overscan' field:

Overscan set to 10, 50, 100, 200 and the result viewed in Nuke

There is a way to view the output image of a render in progress. You must do the following:

  • Set your output to be tiled EXR, zip is fine.
  • Set the bucket scanning method to 'top'.
  • Use a viewer like imf_disp.

Color Space

Arnold has a built-in color manager. It implements the open-source OpenColorIO (OCIO) color management system and uses an OCIO v2 config shipped with Arnold. The color manager is configured to leverage the industry standard ACES color encoding system, setting the rendering color space to ACEScg. If no color manager is linked to in options.color_manager, the built-in one will take over. The default OCIO color manager points at the default OCIO config.

The name of the default OCIO color manager node is called ai_default_color_manager_ocio.

Dither LDR Images

Applies a small amount of noise to the final pixel values. This helps minimize banding artifacts apparent on 8-bit output image file formats.

 

 

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