Java:从图像中裁剪出具有特定颜色的区域 [英] Java: Crop out an area with specific color from an image

问题描述

我想知道是否可以裁剪出具有指定颜色的图像区域?

I was wondering if there is a way to crop out an area of an image with a specified color?

我有一个图像，它是一个画布区域，上面有实际图像，我想删除画布"区域，只保留实际图像.

I have an image which is a canvas area with an actual image on it and I want to remove the "canvas" area and be left only with the actual image.

欢呼

推荐答案

如果您的图片具有明显区别"，请从此 answer 背景色，请使用 LookupOp 具有四个组成部分的LookupTable，用于将与背景色匹配的颜色的alpha组成部分设置为零."

From this answer, if your image has a "distinct background color, use a LookupOp with a four-component LookupTable that sets the alpha component to zero for colors that match the background."

附录:另请参见

Addendum: See also Using the Java 2D LookupOp Filter Class to Process Images and Image processing with Java 2D.

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