Take an input image, and slice it into equal parts
1  | imageSlice(image, x.px.out = 1000, y.px.out = 1000, overwrite = FALSE)
 | 
image | 
 file path to input image  | 
x.px.out | 
 nominal output image dimension, actual dimensions will be calculated  | 
y.px.out | 
 nominal output image dimension, actual dimensions will be calculated  | 
overwrite | 
 logical whether or not to overwrite old outputs  | 
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