The Display tab has many options that affect the rendered image. These options can be separated in 6 categories: Exposure, Filtering, LUT, Glare, Denoise and Photometric Analysis.
Tonemapping: Select the tonemapping method that will be used. (Standard, Filmic, Reinhard Global, Reinhard Local)
ISO: Defines how sensitive the image sensor is to the amount of light present. A Value of 100 is mostly used for exterior shots under a clear sky and Sun lighting. Higher values, usually between 400‐1600 are used mostly for interior shots.
Shutter: Shutter speed corresponds to the duration a camera shutter stays open, measured in 1/sec. Low values result in brighter images.
f‐number: The lens aperture is the ratio of focal length to effective aperture diameter. Low values will make the image brighter.
Gamma: The Gamma factor typically ranges from 1.0 to 2.5. In order to compensate for the darkening of the image due to non‐linear output, we apply a gamma correction scheme to the pixel
values before displaying the image.
Brightness: This parameter is used to compensate for a linear scaling of the image by a monitor.
Sharpness (%): This is the most crucial filter for controlling the filtering during downsampling the image and it is advised to be enabled at default 50% value which is a balanced value between blurring and sharpening. A value near 0% will produce a more blurred image while a value near 100% produces a more sharpened image.
Burn (%): The burn value can be used to compress a High Dynamic Range (HDR) in a Low Dynamic Range (LDR) image, presentable on screens and other limited range devices. Setting burn to 100% means that there is no compression.
Vignetting (%): In photography and optics, vignetting is a reduction of an image's brightness or saturation at the periphery compared to the image center.
Chroma (%): This filter enhances the colors of the image as it is increased, acting as a saturation control.
Contrast (%): Determines the difference in the color and brightness of the object and the objects within the same field of view. 0% equals to a disabled control. 100% is the maximum value that can be set.
White Balance (K): Can be used to change the overall color balance of a render, so that it matches the expected phenomenal appearance. A value of 6500K is usually used to balance lighting coming from Sun and make white walls appear white, despite sun power being more yellowish.
LUT stands for Lookup Table. LUT files can be used to color grade an image. Thea supports 3D LUTs in .cube file format. You can add your own by copying them in Thea Data/LUT folder.
Enable: Enables or disables LUT
Blend (%): Blending between the original and the LUT color graded image
It is possible to add custom LUTs by copying .cube files to the /Thea Data/LUT folder. Those files will be available in the drop-down list the next time you start Rhino.
To find the path to the Thea Data folder, open the Thea Darkroom window and swich to the Console tab. The path can be found in the Thea Data path entry.
Glare is the effect when a high amount of photons arrives at film, causing lighting to flood also nearby areas. The shape of the glare itself depends on the shape of the diaphragm.
Enable: Enables or disables Glare.
Strength (%): Controls how intense the effect will be.
Radius (%): Controls the length of the blades.
Blades: Select how many blades you want. Radial equals to Bloom.
Thea Render provides two AI-Accelerated denoisers.
Denoiser Selector: Intel Open Image Denoise and NVIDIA OptiX.
Blend: Blends the original image with the denoised one based on the defined value. 0%: Original image | 100%: Denoised image.
Intel Open Image Denoise requires a CPU with support for at least SSE4.1 to run.
NVIDIA OptiX works only with NVIDIA graphics cards and requires the latest NVIDIA drivers to work.
Luminance and illuminance properties of a scene are the two key factors in lighting design; they describe the energy arriving to our eyes and space correspondingly, but in the way we, humans, perceive and interpret lighting.
Enable: Enables Photometric Analysis
Min / Max lum‐Illum: represent the range of the Luminance (cd/m2). By changing these values, the false color image is being adjusted accordingly.