Adobe After Effects CS4 - Manual (Page 617)

611 USING AFTER EFFECTS CS4
Effects and animation presets
Last updated 12/21/2009
For an explanation of scene-referred profiles, see “ System gamma, device gamma, and the difference between scene
and viewing environment ” on page 282.
Note: If you open an After Effects 7 project that uses DPX Scene and DPX Theater color profiles in the Color Profile
Converter effect, After Effects CS4 does not automatically update these profiles to the new equivalent profiles (Kodak
5218/7218 Printing Density and Kodak 2383 Theater Preview). Instead, the profiles are listed as Embedded. You can
convert your project by manually assigning the new profiles in After Effects CS4. However, if the same profiles were
assigned to the footage or selected in Proof Colors in After Effects 7, they are automatically updated to the new profiles in
After Effects CS4. (Proof Colors has been replaced by Output Simulation.)
On his fnord website , Brendan Bolles explains how to use the Color Profile Converter effect and film color profiles to
adjust colors and perform tone mapping to make an HDR image appear as if it were shot on motion picture film.
More Help topics
“ Color management and color profiles ” on page 284
Grow Bounds effect
The Grow Bounds effect increases the layer size for the effect that directly follows it. This effect is most useful with
layers that have Collapse Transformations / Continuously Rasterize enabled, because they render using a buffer that’s
the size of the composition. For example, if you apply Drop Shadow to a text layer that’s partially out of the
composition frame, the shadow is clipped because only the portion of the text that’s in the composition frame casts a
shadow. Applying the Grow Bounds effect before the Drop Shadow effect prevents the shadow from being cut off. The
number of pixels you specify increases the height and width of the layer buffer.
Note: You should not need to use this effect when working with effects that work with 32-bpc color, because these effects
have been updated to automatically compensate for layer size.
This effect works with 8-bpc, 16-bpc, and 32-bpc color.
Original (upper-left); the Wave Warp effect is constrained by dimensions of layer (lower-left); Grow Bounds effect fixes problem (lower-right).
HDR Compander effect
The HDR Compander (compressor/expander) effect gives you a way to work with tools that don’t support high-
dynamic-range color—such as 8-bpc and 16-bpc effects—without sacrificing the high dynamic range of footage.
The HDR Compander effect works by first compressing the highlight values in the HDR image so that they fall within
the range of an 8-bpc or 16-bpc (low-dynamic-range) image, and then expanding the values back to the 32-bpc range.