如何解释R中的RGB数组 [英] How to interpret a RGB array in R

问题描述

我在解释从R中读取的图像中得到的RGB值时遇到了麻烦。

I'm having troubles with interpreting the RGB values I get from an image read in R.

我得到的数组显示0-1的值，当时RGB颜色范围为0-255。我试图将它转换回0-255范围，调整这样的脚本，

The array I get show values from 0-1, when the RGB colour range is from 0-255. I tried to convert it back to the 0-255 range adjusting a script like this,

picturemax <- max(picture)
picturemin <- min(picture)
p.picture <- as.numeric(picture)
if (picturemax > 255 || picturemin < 0) 
p.picture <- (picture - picturemin)/(picturemax - picturemin)
p.picture

从 https://stat.ethz.ch/pipermail检索/r-help/2003-January/029098.html
我只是将脚本中的值从0-1更改为0-255，但数组仍显示0-1值，只是不同的值。

retrieved from https://stat.ethz.ch/pipermail/r-help/2003-January/029098.html I just change the values in the script from 0-1 to 0-255, but the array still show 0-1 values, just different ones.

我的图片文件也非常大，并且该阵列不适合R控制台。由于我想将RGB数据输入excel表或文本文件，我不知道该怎么做或如何解决这个问题。

My picture-files are also very large, and the array does not fit in the R Console. As I would like to get the RGB data in to an excel sheet or as a text file, I don't know what to do or how to attack that problem.

如果我的问题太基本，我道歉，但我很高兴能得到所有帮助。
有什么建议吗？

I apologize if my questions are too basic, but I'm happy for all the help I can get. Any suggestions?

干杯，
Maria

Cheers, Maria

推荐答案

如果要将值从（0,1）转换为（0,255），为什么不将它们乘以255？

If you want to transform values from (0,1) to (0,255), why don't you just multiply them by 255 ?

导出你的矩阵作为文本文件由电子表格或其他应用程序读取，您应该查看 write.table 函数。但是，如果你的数据太大而无法放入控制台，我怀疑在Excel中打开它们或者等效它会非常有帮助。

To export your matrices as text files to be read by a spreadsheet or another application, you should look at the write.table function. But if your data are too large to fit in the console, I doubt opening them in Excel or an equivalent would be very helpful.

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