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This page provides information on using the Corona Image Editor for 3ds Max. 


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Overview

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CIE is a portable, standalone application that allows loading a Corona EXR (.cxr) file and applying all post-processing operations which are available in the Corona VFB to it, including adjusting LightMix, running Denoising, LUTs, bloom and glare, without the need to re-render. All of this is done without running any 3D software. It can be seen as a standalone version of the Corona VFB with extended functionality.

 
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Corona Image Editor Shortcuts

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ButtonDescription

Opens a single image.

Merges multiple images produced by Distributed Rendering (DR) render nodes.

Saves the currently displayed element. In the case of the Corona EXR format, saves the whole image and all its settings.

Saves all displayable elements into separate files.

Copies the currently displayed element to the clipboard.

Selects the element to be displayed.

Zooms in.

Zooms out.

Resets zoom.

Toggles visibility of the side panel.

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Post Tab

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For more information about Post Tab – please check Corona VFB (legacy).

 


LightMix

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For more information about Light Mix – please check LightMix. 


Denoising

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Denoise – Immediately denoises all denoisable elements using the most advanced denoising mode that is available for the image.

Denoise Amount – Mixing coefficient between the original (noisy) and processed (non-noisy) image. It allows fine-tuning the effect strength to find the sweetspot between preserving the finest details and removing excessive noise.

Custom Denoise

All – Selects all items for denoising.

None – Unselects all previously selected items for denoising.

Inverse – Inverts the current selection.

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Elements that cannot be denoised are not listed.

Denoise Mode – There are 4 denoising options available. Denoise amount option can be used later to interactively control strength of their effect.

Fireflies Only – Fast filter that just removes very bright pixels from the image (created by any source - noise, caustics, sun reflections, etc).
NVIDIA GPU AI – Very fast GPU-based denoiser. Available only on NVIDIA GPUs when the optional NVIDIA AI Denoiser Corona component has been installed.
Intel CPU AI – (also known as Intel Open Image Denoise) Fast denoising filter applied when render ends. It is a CPU-based denoiser, running on both the Intel and AMD CPUs. It does not have any additional requirements to be executed; if the CPU runs Corona, it can run this denoiser. It is slower than NVIDIA GPU AI denoiser, but can achieve better quality.
High Quantity – A more memory and CPU intensive filter that removes all random noise from the image, creating a noise-free image considerably faster than waiting for the rendering to converge.

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NVIDIA GPU AI mode is not suitable for denoising animation.

Denoise Radius – Controls the radius of the denoising blurring.

 
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Benefits of using Corona Image Editor

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The CIE user interface is inspired by the Corona VFB, sharing its look and feel. Below are some features and benefits of using CIE:

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  • Lower system requirements than working with an image inside any 3D software - it can be run and used on a less powerful computer.
  • It is not necessary to have a scene loaded while you are working with your images, so you can denoise Corona renders outside of the rendering process, reducing the memory requirements significantly.
  • All LightMix and post-processing settings can be easily shared between the VFB in any host application and the CIE.
  • No need to copy settings manually: CXRs from the VFB is automatically loaded with them.
  • It also works with regular, non-Corona EXRs (in Float format). It is possible to add bloom and glare to them, apply your tone mapping settings, LUT, etc. Denoising and LightMix are not available for such EXRs because they do not have the necessary “hidden” auxiliary data.
  • Supports drag-and-drop to quickly load the images.
  • Saves to EXR, PNG, JPG, JPEG, BMP, HDR, IFF, JP2, J2K, RLA, SGI, TGA, TIF/TIFF
  • You can associate the CIE with EXR and CXR files and open them just by double-clicking.
  • Ctrl+O and Ctrl+S can be used for fast image opening and saving.
  • It is a portable application, works with just unpacking, no installation is necessary (license activation is required, though).
  • It is free with a regular Corona license.
 
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CXR Image Format

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The Corona EXR image format (CXR) is almost identical to the standard EXR format with the one difference being the additional data that is saved within the file. This additional data includes all render elements (also ones which are not exposed to the user, which are used during the denoising process), and rendering statistics such as rays per second, noise level, Corona version, etc. To save an image in Corona EXR format either - press and hold the Save button in the Corona VFB and select Save CXR from the dropdown menu.

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If you click the Save button in the upper left corner, this saves only your currently visible render element (render pass in Cinema 4D) in the format of your choice. So if you select the Beauty element and click Save, it saves only the beauty element, without any other elements such as the LightMix, even if you select the CXR format.

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If you click and hold on the Save button and select Save all, this saves each render element as a separate file using the format of your choice.

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If you click and hold on the Save button and select Save CXR, this stores all the information from the VFB (all render elements, including the LightMix, tone mapping, denoising data, etc...) inside a single CXR file. This file can be used to resume rendering later, post-process in the Corona Image Editor, perform denoising later, and so on.

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Alternatively, in 3ds Max you can click Save CXR... in Render Setup > Scene and this has the same effect as clicking Save CXR in the VFB.

 

 



 
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Batch Editing CXR Images

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CoronaImageBatch is a script for batch image processing. It can be used to process multiple images at once using custom .conf files, which can be saved using the GUI version of CIE, or edited manually. Help file and an example CXR file are included in the below ZIP archive.
Example use: save 100 frames of an animation in .cxr format, perform specific post-processing operations and denoising on all of them, and output all of them in .png format.

Download:

Note: you you can run the CoronaImageCmd.exe application with additional command line parameters:

New in Corona 11:

Starting from Corona 11, the Corona Image Editor Command-Line Interface (CIE CLI) now includes a "--batch" parameter for optimized and faster processing of multiple files. This feature allows you to process multiple input files independently, making the batch editing significantly quicker.

Usage:

The "--batch" parameter can be used as follows:

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CoronaImageCmd.exe [arguments] --batch<input-1><output-1><input-2><output-2>batch input-1 output-1 input-2 output-2

In this command, "[arguments]" are optional settings you might want to apply to all images in the batch. For example, to enable bloom and glare for all images, your command might look like:

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CoronaImageCmd.exe --set "Bool bloomGlare.enabled = true" -- batch image1.cxr output1.png image2.cxr output2.png
  • While using "--batch", every provided input image must be followed by its corresponding output file name.
  • The --batch parameter is not compatible with <weight> argument, as weights are used when multiple input files are being processed together to generate a single output file.
  • We have also added the "--batch" parameter in the updated "CoronaImageBatchUpdated.bat" script, which allows for faster processing of multiple files.

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CoronaImageCmd.exe --list-examples

This will print a list of various use cases of batch editing and short explanations of how to make them work. 

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CoronaImageCmd.exe --help

This will print general help. 

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