User guide

245
Control (UI) Default Value Function
frame frame Sets the frame number actually read from disk
prior to applying the inMode, outMode,
firstFrame, and lastFrame settings. When a
downstream node requests an image from an
ImageRead node, ImageRead evaluates this
control to determine the frame number to read
from disk (by default this is the current time). The
result is compared against the firstFrame and
lastFrame values and, if necessary, any
remapping of the actual frame number is done
based on the inMode and outMode settings.
You can retime or offset your input by using an
expression or a curve here, but note that
currently Katana only reads the nearest frame
and doesn't generate in-between frames (no
optical flow interpolation). The value is forced to
an integer at the time it's used, so you don't need
to worry about this if you don't want to.
inMode Black Sets what to do when a frame is required at a
time value prior to firstFrame:
• Black firstFrame to black.
• Freeze
• Repeat
• Mirror
outMode Black Sets what to do when a frame is required at a
time value after lastFrame:
• Black lastFrame to black.
• Freeze
• Repeat
• Mirror
4 NODES I-K | IMAGEREAD