This dialog allows you to set the skip factors for calculating the default output range for the block images. The skip factor specifies the number of pixels to skip between points along the edge of the input image. These points are then used to calculate the size of the output image rectangle needed to accommodate the orthorectified image.
You can reach this dialog by clicking the Recalculate Output Defaults... button on the Ortho Resampling dialog.
The default skip factor is half of the edge length (in pixels) (that is, three points along each edge). If the output image is clipped, decrease the skip factor for the affected edge. This generates more points along that edge resulting in a better calculation.