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Changes for PDL::IO::Image

1.001   2017/07/11
        - new Alien::FreeImage 1.x

0.004   2014/12/15
        - new methods for color conversion:
            color_to_4bpp, color_to_8bpp, color_to_8bpp_grey,
            color_to_16bpp_555, color_to_16bpp_565, color_to_24bpp, color_to_32bpp
        - new methods: dump_bitmap, clone
        - save() method now accepts scalar ref (output is saved into perl variable)
        - new_from_file() method now accepts scalar ref (image is loaded from perl variable)
        - rotate() method accepts bgcolor param(s)

0.003   2014/12/09
        - requires Alien-FreeImage-0.011 (-fPIC issue)
        - void methods return self: $pimage->save("im.png")->save("im.bmp")->save("im.gif")
        - new methods: color_dither, color_threshhold, color_quantize
        - pod fixes

0.002   2014/12/09
        - initial version