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Imagemagick - esmaecer imagem
Colaboração: Rubens Queiroz de Almeida
Data de Publicação: 22 de novembro de 2016
Com a suite de aplicativos ImageMagick podemos realizar uma grande quantidade de operações em arquivos de imagem, diretamente a partir da linha de comando.
Um recurso que utilizei recentemente foi esmaecer uma imagem para poder usá-la como plano de fundo em uma apresentação.
Para isto, o comando utilizado foi:
$ convert-alpha on -channel a -evaluate set 25%
O valor 25% determina o percentual de opacidade a ser aplicado à imagem,
o que significa que a imagem terá 75% de transparência.
As figuras abaixo representam a imagem original e a imagem resultante após a aplicação do comando acima:
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Referência: setting transparency - fading an image
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