Quality considerations
While the default implementation produces a reasonable compromise between quality and performance, it may be necessary to increase the resolution of the source image to improve sharpness or to reduce it to reduce aliasing artifacts.
If the source is an image, use scale=
to choose a different resolution (relative to the full resolution of the image). The specified scale=
value is rounded to the next higher PTIF resolution level. If there is a nested request source, the size of the image produced by the nested request can be adjusted to achieve the desired sharpness. For text layers, the resolution of the input image (the rendered text) is adjusted by selecting a larger size= value with increasing the resolution specified with textAttr=
.
The modifier resOptions
lets you select an alternative resampling algorithm. The following values are supported (case-sensitive):
Value | Description |
---|---|
R1 | Nearest neighbor. |
R2 | Bi-linear. |
R3 | Standard super-sampling (default). |
R3T n | Super-sampling with adjustable jitter ( n must be an integer value from 0 through 200). |
Properties
Layer command. Applies to the current layer or to layer 0 if layer=comp
. Ignored by effect layers.
The modifier res=
is always ignored when perspective is present in the same layer. The modifier size=
is ignored when specified for image layers. The modifiers size=
and res=
in layers with perspective=
are reserved for future use.