;+ ; NAME: ; PNGINTERP ; ; PURPOSE: ; Interpolates between two grayscale .PNG images. ; ; CATEGORY: ; Misc ; ; CALLING SEQUENCE: ; PNGINTERP, Png1, Png2, Times, Outnames ; ; INPUTS: ; Png1: String containing the name of the first (t=0) image. ; ; Png2: String containing the name of the second (t=1) image. ; ; Times: One or more times at which to write interpolated images. ; These may outside the range 0 to 1 as long as this does ; not cause a byte overflow. ; ; Outnames: An array of file names to write the output images to. ; Must be the same length as Times. ; ; EXAMPLE: ; PNGINTERP, 'file0.png', 'file1.png', [0.25,0.5,0.75], ; ['file025.png', 'file05.png', 'file075.png'] ; ; MODIFICATION HISTORY: ; Written by: Jeremy Bailin ; 12 June 2008 Public release in JBIU ;- pro pnginterp, png1, png2, times, outnames image1 = read_png(png1) image2 = read_png(png2) nt = n_elements(times) for i=0l,nt-1 do begin imageinterp = times[i]*image2 + (1.-times[i])*image1 write_png, outnames[i], imageinterp endfor end