Image Processing Options
(default keyboard shortcut Ctrl F8)
The Processing Tab on the Effects Panel contains functions that apply effects to the rendered image. Choose Editors > More Windows > Image Processing to directly bring up the Processing Tab of the Effects Panel.
Limit Dynamic Range
Limit Dynamic Range clips the pixel color components of each rendering pass at the Dynamic Ranges chosen, improving the anti-aliasing of extremely bright areas. This option should not be used with filters or image savers that expect high dynamic range data.
Filters HDR images to aid with the control of hotspots.
Pixel filters let external applications affect LightWave’s rendering engine. Filters in this class can be affected by motion blur and other sub-frame operations during the render rather than as a post process, as image filters are.
FiberFX allows you to create a variety of fibers, hair, and fur effects. For more information see FiberFX.
In print, halftone screens are made up of dots that control how much ink is deposited at a specific location. Varying the resulting dots’ size and proximity creates the illusion of variations of gray or continuous color.
The X Tiles and Y Tiles values determine the number of possible horizontal and vertical dots. If you would like to randomise either of these settings (throughout your animation), use the corresponding Jitter fields.
In the photography world, this type of effect is achieved with a (physical) screen that breaks up the image into dots. Think of the Screen Angle setting as the rotation of that screen. It controls the angle of the dots.
You can control the overall amount of effect by adjusting the Effect Strength setting. Settings below and above the default of 100% are allowed.
You can change the pattern by changing the Spot Type. Specify and animate a Screen Tack Object to animate the pattern position.
LightWave came with a Kitchen HDR image in the LightWave  days. It could be used for lighting a scene for global illumination back in GI's earliest days. It's a 360° photograph of the inside of a kitchen, and look in the background, there's a white window!
That window isn't just white, this is a high dynamic range image. Here's a close-up on that window exposing more for what's outside the kitchen. We can see the top of a building, and yes, fluffy clouds...
Here are some examples with the Hero scene from the supplied content:
Just a straight render with no Tonemapping
Reinhard tone mapping. The difference is incredibly subtle between this and the straight render
The ACES Filmic TMO applied with an exposure of 1.0. Notice the increased depth in the blacks and the overall "polish" of the image
ACES Filmic again, but with an Exposure of 2.0. A similar level of brightness to the straight render, but increased detail in dark areas
ACES Filmic with Exposure 4.0. It's probably best to render the background separately
ACES Filmic, Exposure 2.0. You can also play with Hue and Saturation. The Hero should definitely be rendered separately from the background here
Four types of Tone Map Operator (TMO):
- Linear - This is the default LightWave render. You can control Exposure, Hue, Saturation, Brightness, and Contrast
- Reinhard - The Reinhard method (just to be clear, because Max Luminance is controllable, this TMO is Extended Reinhard) is one of the simplest tone-mapping methods. It guarantees a solution that contains your brightness levels within the 255, 255, 255 range for LDR images, with no blowout. You can control Exposure, Max Luminance, Hue, Saturation, Brightness, and Contrast. Results can look grayish if you are working with brightly colored, highly saturated subjects
- Filmic - The Filmic TMO is designed to replicate the look of film in the real world. It is based on John Hable's work. You control Cutoff, Max Luminance, Hue, Saturation, Brightness, and Contrast
- ACES Filmic - The Academy Color Encoding System (or ACES) is a color image encoding system created by industry professionals with guidance from AMPAS (Academy of Motion Picture Arts and Sciences). It is rapidly becoming an industry standard. You can further control Exposure, Hue, Saturation, Brightness, and Contrast. ACES Filmic is much-praised for its film-like color response with rich blacks, and vibrant lighter tones
Some TMOs have the following settings:
- Exposure - (Default 1.0) The Exposure control is a multiplier for your color channels
- Max Luminance - (Default 1.0) Luminance is the value of light reflected off a surface. The Max Luminance setting allows further control for exaggeration or damping down of reflections
- Cutoff - (Default 0.025) Values below this level are treated as black
All TMOs have the following settings:
- Hue - (Default 0.0 °) Rotate the color wheel to tint your render
- Saturation - (Default 100 %) Reduce or increase the amount of saturation in the render
- Brightness - (Default 100 %) Reduce or increase the overall brightness of the rendered image
- Contrast - (Default 0 %) Reduce or increase the overall contrast of the rendered image
Settings are maintained between TMOs where possible.
Tonemapping is a great way to get a quick look at how to push your images for the best look. It's ideal in that it can be used in VPR, but it does take a floating-point image and remap it into display space; your images will no longer be in high dynamic range. If you are using LightWave in a compositing workflow, you should definitely not use tone mapping in LightWave because it is inherently destructive for final renders. Tone mapping should occur in the compositing application.
Image filters, unlike Pixel filters in the previous section, act on an image as a whole. They can be used for a variety of things, from saving out a layered Photoshop file to achieving a light bloom effect on your render, or making it into a sepia or monochrome image. Some of the filters can be applied directly to images you use within LightWave - for instance, full precision blur can be used to soften black and white images intended for a Bump Map.
Image filters are a post-process effect. This means that they get applied only once all rendering has been performed.