image = READ_PNG ('~lecjm/public_html/Teaching/IDL_course/New_Course_v1/Data/080409_1000_wv62.png') window,0,retain=2,xsize=1180,ysize=1180 tv,image
Read off values using rdpix.
Try tv,bytscl(image) and tv,hist_equal(image). What do these actually do?
How would you resize the image so it fits in a smaller window? (Look up rebin and congrid)