Node Image Filter
-Node Editor for Image Filter, works like Textured Filter with some add-on experimental tools.-Other render buffers than Color and Alpha, must be enabled in root node panel. -"Alpha Mode" option in root panel is a choice between:
"Replace Buffer" overwrite current LW alpha buffer with alpha input,
"Mix with Buffer" will mix alpha input with current LW alpha buffer (max value)
and color input is mixed with Color Buffer like in LW Textured Filter.
Empty Global Buffers are available to export Image Filter evaluations, Buffers already
used in Pixel Filter node editor, can't be overwritten and are locked.
Add a Get Global Buffer node to output a Buffer, filter it, connect to a different
and empty Global Buffer in the root of Image Filter node editor, use the same
Get Global Buffer node to save this new Global Buffer in a file. All nodes below are located in DP Kit/Processing folder.
Render Buffer Node-Render Buffer Node, works with Node Image Editor (full stored buffer)
with Buffer enabled in Editor and Node Pixel Editor (per pixel buffer only). Extra Buffer Nodes -"Store Extra Buffer" Node for Surface node editor,
"Get Extra Buffer" Node for Pixel and Image Filter node editor. -6 Color and Scalar buffers (24 in 9.5 version), which can be filled through different
nodal surfaces of different objects to complete partial or whole image buffer. -Part of the rendered image like Ambient Occlusion scalar or Normal color
can be buffered with their nodal setup connected to the "Store Extra Buffer"
node in surface node editor, but not rendered in the current image,
then using the output of the "Get Extra Buffer" node these buffers can be :
redirected/connected to an LW buffer in the PixelFilter node editor,
or mixed with the rendered image or another buffer, in the ImageFilter node editor.-Store Extra Buffer node need to be connected by its Access output to any unused
channel, which accepts a constant value of 1, this is required to access the
Nodal System. -"Enable AntiAliasing Buffer x" so AA can be disabled for PixelFilter node editor,
"MotionBlur" must be on for detecting samples. -"Force AntiAliasing Buffer x" for averaging evaluated spot samples in the buffer
of the ImageFilter node editor, do not check this option in PixelFilter node editor.
This option doesn't work, if you add more samples in the new 9.2 motion blur,
or use current motion blur, cameras ACT with Adaptive Sampling. -Extra Buffers can be saved as image files in Get Extra Buffer node.
You just need to add this node in Image Filter node editor without connection
then select buffer, format and output filename in its panel.
Image saving is now also available in Pixel Filter node editor. Note: Current LW buffer even modified can't be stored also in an Extra Buffer
in Pixel Filter node editor and saved in Image Filter node editor.-Replace Spot node is an addon to fill/replace a few Spot Infos in a nodal chain
in Filter node editors, original Object Spot, World Spot and Smoothed Normal should
be stored in Color Buffers with Store Extra Buffer node in the surface node setup. All nodes below work directly with Image Filter node editor (full stored buffer)
or in a second instance of Pixel Filter node editor.
other buffers than Color & Alpha need to be enabled in the node editor panel. Blur Node -Blur Node for blurring rendered image.Push Node -Push Node for moving rendered image. Scale Node -Scale Node for scaling rendered image. Rotate Node -Rotate Node for rotating rendered image. Deformer Node -Deformer Node for displacing pixels of the rendered image. Buffer Mixer Node -Buffer Mixer Node, it does the same thing than Color Mixer Tool Node,
but with (square) screen Preview. -When using Buffer Mixer in Image Filter Editor with Render Buffer Node input,
it must be connected to the rootNode first to acquire image buffer,
then it can be disconnected and still be used as a single previewer (FG input). Divide Node -Divide node for safe Color division, for replacing LW Math Vector Divide node,
avoiding issues while dividing a color pixel by a black pixel (zero).
It can be used for Color Buffers with empty Background. Exposure Node -An Exposure node (9.5+) for applying constant exposure correction on a over-exposed
image, the highest luminance (max luminance input after rendering) is the reference
to know for adjusting "(inv) exponential exposure". Tone Map Node -A Tone Map node, based on Erik Reinhard's algorithm,
doing tone map correction of any HDR color input in preprocess or postprocess mode,
for previewing a larger image use Image Viewer or Viper. -White Point:
This option should be set to a very large number (1e20 is default)
for high dynamic range images, and should only be set to a small value if the input
is already low dynamic range.
All input luminances larger than this value are mapped to white. -Average Luminance:
The log "Average Luminance" of the input is mapped to this value (Default value 0.18).
If this produces an image that is too dark, try doubling this value.
If the image is too light, try halving this value. -Use Scales:
By default it uses a fast and efficient global mapping.
"Use Scales" invokes the multi-level scale selection mechanism.
For some high dynamic range images, this produces better contrast. -Sharpening:
Default value 1, means no sharpening.Filter Node -Filter node includes 23 filter presets:
Soft, Blur, Sharpen1, Sharpen2, Sharpen3, Emboss, Laplace, Shadow,-All filters apply a 3 x 3 convolution to the input image.
Diagonal, Horizontal, Vertical, Woodcut, North, East, South, West,
Northeast, Northwest, Southeast, Southwest,
Sobel, Prewitt, Kirsh.
Sobel","Prewitt" and "Kirsh" add a second reverse convolution for edge
detection. -Filter can be applied to the input color or scalar for an black&white,
Color or Grey ouput. -"Threshold" affects all ouput types, set a zero value for full filtering effect,
-"Amount" will mix the effect with color or grey input.
-if "Border Edge" option in Filter node checked, outside pixels are ignored but
border of the image could appear "edged", if it is unchecked the image is mirrored
for outside pixels to avoid sharpened border. Denoiser Node -Denoiser node is a bilateral blur for removing noise, leaving untouched
the edges in the image. -The optional Reference Color and Alpha is used for edge detection only,
so a Depth Buffer and a Normal Color (Extra) Buffer can be input to avoid
confusion between undesired noise and current model details and edges.
Without input, the Color and/or Alpha input are used as self-reference.-"Sigma" is the edge detection level, smaller value is best for midtone,
-"Blur" is the level of blur.
Both parameters are evaluated per image, not per pixel.
