PixelGrabber vs getRGB中哪一个更快? [英] Which amongst PixelGrabber vs getRGB is faster?

问题描述

我试图通过捕获图像像素来实现图像上的 Hill Cipher 算法.事实证明，小的图像可以很好地加载.

I was trying to implement Hill Cipher algorithm on an image by grabbing its pixels. And it turns out that small images were loading fine.

但是对于较大的图像(8MP或12MP)，加载速度很慢；因此写入图像的速度也很慢.

But with bigger images (8MP or 12MP), the loading is slow; and as a result writing the image is slow too.

我正在使用bufferedImage.getRGB(x,y)抓取每个像素，使用算法对其进行修改，然后使用bufferedImage.setRGB(x,y,rgb)同时写入像素.

I was grabbing each pixel using bufferedImage.getRGB(x,y), modifying it using the algorithm, and writing the pixels simultaneously using bufferedImage.setRGB(x,y,rgb).

现在，我需要一些建议来加快加载/写入速度.我想知道PixelGrabber是否会更好?

Now, I need some suggestions to make the loading/writing faster. I was wondering if PixelGrabber would be any better?

推荐答案

getRGB/setRGB 非常慢，因为每次调用它们时，它们都会进行大量的颜色空间检查和颜色转换.考虑到典型图像中的像素数量，绝对不是进行任何图像处理的方法.

getRGB/setRGB are very slow, because they do a lot of colorspace-checking and color-converting every time you call them. Definitely not the way to to any image-manipulation, considering the number of pixels in a typical image.

通过旧的PixelGrabber或BufferedImage.getRaster()将原始图像数据获取到数组中比较困难(您必须了解一些概念)，但是运行起来要快得多.

Getting the raw image data into arrays via the old PixelGrabber or via BufferedImage.getRaster() is harder (you have to understand a few concepts) but runs much faster.

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