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ArionFX is much more than just a tonemapping operator plug-in. It is a very complete HDR image post-processing toolset.

By the name ArionFX toolchain we refer to the list of consecutive stages, or components, that form the ArionFX filter.

 

 

All stages are optional, and are arranged in a way that ensures that the input floating-point information is carried correctly from beginning to end, with no loss.

Internally, some effects must be applied before Tonemapping, in High Dynamic Range (e.g., Despeckler, Bloom, Glare...), while some effects must be applied after Tonemapping, in Low Dynamic Range (e.g., Sharpen, Grading...).

The tabs in the UI reflect the order in which said stages are applied.

 

WARNING

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It is entirely possible to manually apply different ArionFX stages separately. For example the Despeckler can be applied, and then ArionFX can be started again to apply something else.
However, once Tonemapping has been applied, the image becomes Low Dynamic Range. It is then impossible to get proper output from HDR effects from the Input, Noise and Lens tabs.

WARNING

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The Information tab in the UI displays a green icon if the input image is HDR, and a warning or error sign otherwise.
Note that ArionFX can be applied on any type of image (even LDR or integer). The warning/error signs are there to inform the user that those effects requiring true HDR input will produce a clamped output.

 

 

   

Lens glare applied after Tonemapping.
ArionFX is unable to find high luminance pixels as they were clamped
to the 0-255 (or 0..1) range during the tonemapping operation. 

   

Lens glare applied before Tonemapping.
ArionFX is able to detect high luminance pixels directly from the HDR data
and applies a beautiful and correctly powered glare. 

 

 

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