Natron 2.2.8 Released

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Natron 2.2.8

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## Version 2.2.8

– OpenGL interact is now always affected by transforms even if there is motion blur.

### Plugins

– Radial, Rectangle and generators: when the Extent is set to Size, and Reformat is not checked, Bottom Left and Size can be animated.
– add Box filter to Transform, CornerPin, GodRays, and all Distortion nodes.
– ContactSheet, LayerContactSheet: Make a contact sheet from several inputs, frames or layers (beta)


Natron RGBToYUV709 Node for preprocessing colorspaces

I am experimenting with Natron’s colorspace transform node to process an image or video at the root color channel level individually as oppose to all the channel combined together. This is my way of adding pop, depth or dimension to my shots. You can use this process with the Lab, YUV, YCrCb color spaces for green/blue screen projects as well.

Visit these sites

ButtleOFX: Open Source Compositing Software

If anyone on this network is interested in compositing VFX work, there is an open source compositor app being developed on the Linux platform and later for the PC. The API for MacOs development has not been planned yet. You can visit the site and see a demo for a Linux alpha release at This application she be a free high compositor once in beta release.


Color Balancing & White Balancing Your Video

These are links that discuss the need and techniques of color balance or white balancing your video.

Blender3D Node Based Compositing Keying Example

Blender 3D has an amazing node base compositor. The examples below are just 1 of many examples on pulling a matte in an open source application like Blender. The image is using a split screen node to show how the advanced keyer is pulling a screen matte on the left and and source alpha matte on the right. This viewing example help you visualize noise such as grain and other fire flies in your matte.

Split_Screen_Source Matte

Split_Screen_Source Matte

This image is a process using nodes to pull a Difference Key Matte / Spill Suppression.  Some color keys, linear keys and chroma-keys nodes may not have enough color information based on the hue and chroma sampling in the image. Their algorithms may be coded to key certain range of colors. I have learned this process from the great Steve Wright.  He is a VFX GURU. Using the math node and color ramp node to subtract one channel from another and then clamping my whites and blacks, I was able to get a decent HI-CON matte.


Difference_Matte / Spill Suppression

After your all your keys has been pulled, the final is to sell the shot with what is called an edge matte. It is also know as doing a lightwrap. All objects in nature has some sort of absorption or reflection around its edges as well as on it’s surfaces. You use the edge matte (lightwrap) as a mask to let some of the background image pixels bleed through the foreground objects. When pulling a key it can sometime produce hard edges or edges that make to foreground seam out place. Lightwraps are your friend when its comes to green,blue,red screen keying.



Edge Matte (lightwrap) final comp with basic grading.



Blender 3D also has a clip assembler from the scene modeler, animation and the compositor. It’s main name is called the “VSE”. In the VSE you can edit and arrange video, still images, audio and color correct / color grading for your finishing.



Sometime in the future I may revisit this process with higher quality images in stead of the internet’s low-res JPEGs.  I will also demo the 2d/3d camera motion tracker, masking  and rotoscoping features in blender.