Rendering menu > Video Post > Video Post window > Make sure no events are selected in the queue. > Video Post toolbar > Add Image Input Event > Select a file for input. > Options
The Image Input Options dialog contains controls for setting the image's size and placement relative to the frames of video output. For animated input, you also use it to synchronize the Image Input event with the frame sequence of video output. The same dialog appears when you click Options from the Mask area of the Filter Event and Layer Event dialogs.
To align the input image, do one of the following in the Image Input Options dialog:
Choose Presets and then click one of the preset alignment buttons.
Choose Coordinates and then enter the X,Y coordinates for the image's location.
The upper-left corner is (0,0) for both the input image and the output frame. Increasing X moves the image to the right, and increasing Y moves the image down. Negative values move the image in the opposite direction. X and Y values specify pixels.
To set the input image size, do one of the following in the Image Input Options dialog:
Choose Do Not Resize to maintain the image's original resolution.
Choose Resize to Fit to change the image size to match the output frame.
This can change the image resolution, causing it to be rescaled for every frame.
Choose Custom Size and then enter the width and height of the image in the output frame.

Presets—Positions the image according to one of the preset buttons: Top-left, Center, Top-right, and so on. Mutually exclusive with Coordinates.
Coordinates—Positions the image according to coordinates you enter. Mutually exclusive with Presets.
Do Not Resize—Retains the image's original, stored dimensions.
Resize to Fit—Resizes the image to the size of the Video Post rendered image (default).
Custom Size—Resizes the image according to width and height units you enter.
From/To—Specifies the range of frames to use if the image input file is an animation or video.
Step—Sets the interval between the frames you want to use. For example, if this spinner is set to 7, 3ds Max uses every seventh frame.
Loop at End—Plays the frames from the beginning when the last frame is reached. This will take effect if the frame range used is less than the Video Post frame range.