java - How can I make a gif out of a .png containing several frames? -

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i need automatically convert animated .gif .png file containing several frames. know how many frames each file contain. images have transparency, no alpha channel. frames sorted vertically, although guess won't make difference. since don't have enough reputation seems can't upload pics, can figure.

is there library can use? i'm pretty new java , i'm stuck this.

thanks.

what need crop big png several small images (frames), , build animated gif.

meet imagemagick.


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