Gizmo: ShakeMask. Mask node ala Shake.

[Francis Vega]

Hi all;

I'm new in comp/post and Nuke, but I "played" a little with Shake. I Created a gizmo to simulate the input mask in shake (M).

The node has two inputs: Mask and FG. Issue: If the FG image has not alpha channel we have to put one if not, the channel merge doesn't work. I don't know how to fix that.

MaskShake v0.1

set cut_paste_input [stack 0]
version 4.7300
push 0
push $cut_paste_input
Group {
inputs 2
name ShakeMask_v01
tile_color 0xffffff00
selected true
xpos 401
ypos 218
addUserKnob {20 User}
addUserKnob {41 Invert_Mask T Invert2.disable}
addUserKnob {41 Premult T Premult3.disable}
}
Input {
inputs 0
name Mask
xpos -210
ypos -119
number 1
}
add_layer {alpha rgba.alpha}
Invert {
channels alpha
name Invert2
xpos -210
ypos -63
}
Input {
inputs 0
name FG
xpos -100
ypos -117
}
ChannelMerge {
inputs 2
operation intersect
name BoolChannels
label "Mix Channels"
selected true
xpos -100
ypos -77
}
Premult {
name Premult3
xpos -100
ypos 20
}
Output {
name FG_Masked
xpos -100
ypos 120
}
end_group

[Aruna]

So how is this different from just a ChannelMerge Node? The Input Mask in Shake is on the side of every node, used as a mask when colorcorrecting or any other image processing, so just doing what you're doing is just Channel Merging one node with another, you're not doing any processing except Premulting..

[Francis Vega]

You are right Aruna, I just playing with nuke features :P Nothing news in this gizmo, just a group channelmerge, premult and invert.