How to make an image transparent with gradient effect?

[bil80]

I am not an expert in ImageMagick, and i want to make an image transparent with gradient effect as on Photoshop:


Transparency effect with Photoshop:

[snibgo]

Windows BAT syntax:

Code: Select all

convert ^
  clooney.jpg ^
  ( +clone ^
    -sparse-color barycentric "0,0,white %%[fx:w-1],0,white 0,%%[fx:h-1],black %%[fx:w-1],%%[fx:h-1],black" ^
  ) ^
  -compose CopyOpacity -composite ^
  c.png

[bil80]

Yes thanks a lot !

[snibgo]

My solution was over-complex. I had forgotten that barycentric can work with just two coordinates:

Code: Select all

convert ^
  clooney.jpg ^
  ( +clone ^
    -sparse-color barycentric "0,0,white 0,%%[fx:h-1],black" ^
  ) ^
  -compose CopyOpacity -composite ^
  c.png