xf2rotmagstr(1) General Commands Manual xf2rotmagstr(1)NAMExf2rotmagstr - Convert transforms to rotation, magnification, stretchSYNOPSISxf2rotmagstr input_fileDESCRIPTIONxf2rotmagstr takes a file with a set of linear transformations expressed as 2x2 matrices plus a shift in X and Y, and converts each 2x2 matrix to a rotation, magnification, and stretch along an axis. The output appears as: 1: rot= 11.80, mag= 1.0001, str= 0.9916 on -4.9 axis, Mean mag= 0.9959 where rot is rotation angle in degrees, mag is magnification factor, str is a stretch factor, the axis of the stretch is given in degrees of rotation from the X axis (counterclockwise positive). Mean mag is the average size change with the stretch taken into account. Rot, mag, and str match the values that would be shown if the transformations were read into midas. The program will also accept a warping file as produced by Midas or Tiltxcorr. In that case, it extracts the linear transformation for each section and uses it to produce the same report. The format of each line of a simple linear transformation file is a11 a12 a21 a22 dx dy where the coordinate transformation is x' = a11 * (x - xci) + a12 * (y - yci) + dx + xco y' = a21 * (x - xci) + a22 * (y - yci) + dy + yco and x, y is the original position, x', y' is the position in the trans- formed image, xci, yci is the center of input images, and xco, yco is the center of transformed images.HISTORYWritten by David Mastronarde, added to IMOD 10/5/06BUGSEmail bug reports to mast at colorado dot edu. IMOD 4.10.18 xf2rotmagstr(1)