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ArionFX for Photoshop | Clustr

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ArionFX for Photoshop

Published:  September 05, 2014    Category:  Rendering    Published by:  GriT  
Dealing with 32-bit HDR images can still be problematic nowadays, as few software packages support 32-bit formats properly. ArionFX for Photoshop is a versatile tool that offers a variety of key HDR image processing algorithms designed to function in floating-point 32-bit HDR data. Remarkably, ArionFX operates in Linear Workflow, not washing out your image, and respecting its full dynamic range at all times. Whether you are a photographer or a CGI artist seeking for advanced HDR tonemapping, firefly removal, glare, bloom, ... ArionFX is a must in your toolchain.

HDR tonemapping

ArionFX for Photoshop features various advanced techniques to adjust the luminance or enhance the details in HDR photographs and renders.

  • Real-world camera response operators.
  • ISO film (gain) control.
  • Histogram stretching and clipping controls.
  • Color saturation and white-balance correction.
  • Reinhard '02 tonemapping operator (global).
  • Reinhard '02 tonemapping operator (local).
  • Reinhard '05 tonemapping operator (global).
  • Reinhard '05 tonemapping operator (local).
  • RandomControl '14 tonemapping operator (local).
     

Global and local operators

ArionFX provides a variety of tonemapping operators; both popular algorithms, and algorithms developed in-house. Each of these has a characteristic behavior, offering great flexibility so it is always possible to achieve the look that one is after.

The RandomControl '14 operator has been designed to maximize local contrast, preserving detail even in areas where the original photograph looks burned or washed out. Moreover, this operator minimizes the classic HDR-ish look or halos that other tonemapping solutions suffer.

Our proprietary solution mimics the Human Vision System, allowing the user to achieve proper contrast and detail everywhere, while not losing the natural look that the naked eye would perceive at the real scene.
 

Real-world camera response operators

ArionFX offers multiple color-grading presets modeled after data extracted from real-world chemical film and digital sensors. Enabling one of these presets automatically transfers to the image the same color-grading curves that said sensors or film would follow in real-life.

ArionFX also provides numerous functions to control the final tonemapped image such as midtones, saturation, white-balance...

 


HDR noise processing
HDR Despeckler

In unbiased rendering, it is not uncommon to come across small rendering artifacts called 'fireflies'. These fireflies may sometimes be too hard to avoid, and a nightmare to remove in post-processing.

ArionFX features a high-performance speckles removal algorithm which works similarly to Photoshop's native Dust and scratches filter, but in 32-bit HDR.

The ArionFX despeckler has been designed specifically to be very smart at finding and resolving fireflies, by analyzing arbitrarily-shaped out-of-range clusters of pixels in the image.

 

HDR film grain

Adding good-looking film grain to a picture or a render is often more complicated than it seems.

In low light conditions, the use of low shutter speed and/or higher gain (ISO sensitivity) produces shot noise (film) or electronic noise (digital cameras) that is more visible in the dark parts of the image than in the correctly exposed subjects.

This is usually not correctly simulated by low dynamic range noise filters, which do not operate on raw linear-space luminances like ArionFX does. In ArionFX, film grain is properly added to the picture before the tonemapping happens, which leads to a very well-balanced and natural result.

 


HDR lens effects

ArionFX for Photoshop features several ways to alter photographs and computer-generated images by simulating certain lens defects for artistic effect.

HDR vignetting

Vignetting is the phenomenon by which luminance is reduced at the periphery of an image captured through an optical system, such as a camera.

Vignetting gives a more natural feel to your images and may help frame the subject better. Actually, it is a particularly interesting way to improve the realism of computer-generated images.

 

HDR bloom

Bloom is a phenomenon that happens when a very bright light source is captured by an imaging device.

There is some degree of scattering and diffraction affecting each and every ray that reaches the camera. This effect is usually negligible, but the physical imperfections in the optics, or the high power of a very strong source of light may be enough to amplify these aberrations and make them become visible.

ArionFX for Photoshop simulates these effects in a physically-correct manner, as long as the picture is providing a sufficiently high dynamic range.


HDR glare

Glare is a pattern caused by the diffraction of light as it crosses the aperture shape of the capturing device (e.g., the camera diaphragm).

Bloom, glare, or both together can greatly improve the realism of computer-generated images or add a subtle artistic glow to HDR photographs that do not exhibit these artifacts by themselves.

To read a more technical description of these phenomena, please visit this entry on the ArionFX's development blog.


Color fringe

ArionFX simulates the very well-known chromatic aberration of optical lenses in a physically-based, spectral manner.

Chromatic aberration happens when a lens or a lens assembly fails to focus all light wavelengths to the exact same point on the capturing film or sensor. This produces a radial fringe of colors on the picture.

The amount of color fringe depends mostly on the quality of the optics, but is unavoidable on very wide lenses such as fish-eye or very short focal length assemblies.

 



HDR sharpening

HDR sharpening provides an efficient, quick, and reliable way to enhance the details of photographs and computer-generated images.

When shooting HDR photographs, sometimes even a tripod is not enough to obtain a perfectly steady camera, and some ghosting and blurriness may occur during the HDR assembly process.

ArionFX allows you to reduce the perceived blur of an image using a fine details enhancer based on frequency analysis. Our algorithm works on the luminance field, leaving chromaticities unaltered, in order to avoid color shifting around hard edges.

Source:  RandomControl, SLU.      Share:    Views: 1191

 
   

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