Re: [Natron-VFX] Color Blender and Alpha Blending modes: Merge Node & Roto Node layering

[Frédéric Devernay]

and more references, direct from the source code https://github.com/devernay/openfx-supportext/blob/master/ofxsMerging.h

Looks like we also found a Nuke bug

// References:

//

// SVG Compositing Specification:

//   http://www.w3.org/TR/SVGCompositing/

// PDF Reference v1.7:

//   http://www.adobe.com/content/dam/Adobe/en/devnet/acrobat/pdfs/pdf_reference_1-7.pdf

//   http://www.adobe.com/devnet/pdf/pdf_reference_archive.html

// Adobe photoshop blending modes:

//   http://helpx.adobe.com/en/photoshop/using/blending-modes.html

//   http://www.deepskycolors.com/archive/2010/04/21/formulas-for-Photoshop-blending-modes.html

// ImageMagick:

//   http://www.imagemagick.org/Usage/compose/

//

// Note about the Soft-Light operation:

// Soft-light as implemented in Nuke comes from the SVG 2004 specification, which is wrong.

// In SVG 2004, 'Soft_Light' did not work as expected, producing a brightening for any non-gray shade

// image overlay.

// It was fixed in the March 2009 SVG specification, which was used for this implementation.

Le 14 août 2014 à 22:42, omar brown <vegas...@gmail.com> a écrit :

As some might know that there are plenty of blending modes in Natron.  When you start to dig deeper in Natron, you will notice differences between the Merge and Roto nodes blending modes.  I had did some research that can help visually what those modes do.  Please links below.

https://www.mapbox.com/tilemill/docs/guides/comp-op/#color-blending
https://www.mapbox.com/tilemill/docs/guides/comp-op/#alpha-blending
http://en.wikipedia.org/wiki/Blend_modes
http://photoblogstop.com/photoshop/photoshop-blend-modes-explained


See attached links below for screen shorts of nodes layer modes.
https://flic.kr/p/oGmTey
https://flic.kr/p/oJoHQg

Best regards,

Blackearth2014

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