[R] PCA on image data

[Bio7]

Dear R users,

i would like to apply a PCA on image data for data reduction. 
The image data is available as three matrices for the 
RGB values. At the moment i use

x <- data.frame(R,G,B)#convert image data to data frame
pca<-princomp(x,retx = TRUE)

This is working so far. 
>From this results then i want to create a new matrix
from the first (second..) principal component. Here i stuck.
So my question is how can i create this matrix from the results of the PCA.
(Maybe there is also a faster method available for PCA?)

Any answers or advices are appreciated

With kind regards

M.Austenfeld

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