Here I show some simple image processing methods. A good place to start with this is THIS NICE PAGE ABOUT COMMAND LINE OPTIONS FOR CONVERT.
NOT FOR PHOTOMETRY! Use for cartoons only!Just get some basic info: % identify ifu_fiber_pattern.png ifu_fiber_pattern.png PNG 647x669 647x669+0+0 8-bit DirectClass 189KB 0.000u 0:00.000 % convert a.fits -rotate 45 b.fits Rotates image about the origianl center CLOCKWISE (CW = Positive Angle) by an angle of 45 degrees. % convert a.fits -rotate -70 b.fits Rotate COUNTER-CLOCKWISE (CCW = Negative Angle) by angle of -70 degrees. % convert ngc2266.png -colorspace gray ngc2266.fits Put geyscale channel into a fits file.