如何使用BufferedImage和YCbCr色彩空间？

问题描述

我需要将加载到BufferedImage的位图中的颜色从RGB转换为YCbCr（亮度和2通道色度），并在处理后返回。

像rgb2ycbcr（）在每个像素的主要方法，但它不是那么聪明的解决方案。我应该使用ColorSpace和ColorModel类来获得具有正确颜色空间的BufferedImage。这将是更灵活的方法，但我不知道该怎么做。

我迷路了，我需要一些提示。

解决方案

当我理解你的问题时，你想做以下事情：

载入RGB图片 - > 处理YCbCr图片 - > 再次使用RGB图片

您希望我们帮助您，使这个过程尽可能无缝。首先，你最想让我们给你一个简单的方法来避免 - > （转换）零件。

我调查了。看起来好像没有办法改变曾经创建的 BufferedImage 的 ColorSpace 。

您可以使用YCbCr颜色空间创建一个新的 BufferedImage ，您可以使用预定义的。然后，您可以通过 ColorSpace.fromRGB 将数据从旧图像复制到YCbCr颜色空间，进行图像处理，然后通过 ColorSpace再次转换。 toRGB 。此方法需要您通过现有方法在处理之前和之后完全转换图像。此外，你必须知道， ICC_ColorSpace 如何将你的图像转换为YCbCr颜色空间。

如果你只想创建一个围绕RGB的包装器 - BufferedImage ，可让您操作此图片，就像是YCbCr图片，而不能使用 BufferedImage 。

编辑：
要转换 BufferedImage 的颜色空间，请使用。代码看起来像这样：

  ColorConvertOp cco = new ColorConvertOp（new YCbCrColorSpace（），null）; 
 BufferedImage ycbcrImage = cco.filter（oldRGBImage，null）; 
  

这需要你自己写 ColorSpace 课程，或者您可以下载并使用提供的课程。如果您只想加载JPEG图片，则应该使用。

I need to translate colors in bitmap loaded to BufferedImage from RGB to YCbCr (luminance and 2 channels chrominance) and back after process.

I made it with functions used like rgb2ycbcr() in main method for each pixel, but it isn't so smart solution. I should use ColorSpace and ColorModel classes to get BufferedImage with correct color space. It would be more flexible method, but I don't know how to do that.

I'm lost and I need some tips. Can somebody help me?

解决方案

As I understood your question, you want to do the following:

Load RGB image -> process YCbCr image -> Use RGB image again

And you want us to help you, to make this process as seamless as possible. First and foremost you want us to give you a simple way to avoid the -> (converting) parts.

Well I looked into the BufferedImage documentation. It seems, as if there doesn't exist a way to change the ColorSpace of an once created BufferedImage.

You could create a new BufferedImage with an YCbCr color space for that you can use the predefined ICC_ColorSpace. Then you copy the data from your old image possibly via ColorSpace.fromRGB to the YCbCr color space, do the image processing and then convert again via ColorSpace.toRGB. This method requires you to fully convert the image before and after processing via existing methods. Furthermore you have to know, how ICC_ColorSpace converts your image to YCbCr color space. Otherwise you can't know, which array indices corresponds to the same pixel.

If you just want to create a wrapper around the RGB-BufferedImage that lets you manipulate this image, as if it was an YCbCr image, that isn't possible with BufferedImage.

EDIT:To convert the color space of a BufferedImage use ColorConvertOp. The code would look something like this:

ColorConvertOp cco = new ColorConvertOp(new YCbCrColorSpace(), null);
BufferedImage ycbcrImage = cco.filter( oldRGBImage, null );

This requires you to either write your own ColorSpace class or you could download and use the classes mentioned here. If you just want to load a JPEG image you should use the predefined classes.

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