[Filip Vandueren]

or the effect distort -> turbulent displace does it in one go

[Filip Vandueren]

hi,

2 possibilities:

one way:

create a solid layer, or use the graphic layer on which you want the effect.

with the mask tool, draw a rectangle that falls mainly outside the solid, but overlaps where you want the gradient to be.
like this:

              +---------------------+
              |                     |
+-------------+--+                  |
|             |  |   rectangular    |
|     solid   |  |   mask           |
|             |  |                  |
+-------------+--+                  |
              |                     |
              +---------------------+

Now give that mask a mode of subtract and a horizontal feather until it looks right. You can move the mask to the left or right to fine-tune, or use the mask-expansion parameter

other way:

add a transition -> linear wipe-effect
settings:
Transition Completion: 20%
Wipe Angle: -90

[Filip Vandueren]

Hi there,

look into “toggle hold keyframe”

just set one keyframe to 0 the other to 100
control-click/right-click on the first keyframe and you’ll see the option “toggle hold keyframe”

the keyframe icon will change shape into a square, or a half square

this will hold the value untill the next keyframe, so no interpolation occurs.

[Filip Vandueren]

If you can bare breaking it up in multiple layers to achieve the effect try this:

using 3 copies of the layer:

• desaturate the bottom layer using your favourite method (be it channel mixer, hue/saturation etc.)
  • give it a a levels-effect, setting:
    RGB: input white: 128 / output white:128; (all the other params @ default value)
  • then add a tint-effect and
    think of black as the black value of the tritone
    think of white as the mid value of the tritone
    forex. black = red, white=orange
• desaturate the middle layer
  • give it a Shift Channels-effect, setting:
    Take Alpha From Luminance
  • then add a levels-effect, setting:
    RGB: input Black: 128
    Alpha: input Black: 128
  • then add a tint-effect and
    think of black as the mid value of the tritone (same as white color in the bottom layer)
    think of white as the white value of the tritone
    forex. black = orange, white=yellow
• give the top layer a transfer mode of luminosity

alter the opacity of the top layer to taste, and precompose if that’s more handy.

This should achieve a ‘true’ tritone effect using standard filters, just keep in mind you use the same “mid” value in both tint filters.