How could I get the Buffer of NdArray returned by numjs? about numjs

[nicolaspanel]

As you say, the problem comes from flatten + tolist that makes deep copies of the original array.

To access the raw data of the image, you can do this:

var nj = require('numjs')
var img = nj.images.data.lena;
img.shape // => [ 512, 512, 3 ]
img.dtype // => uint8
img.selection.data // Uint8Array 

see https://github.com/nicolaspanel/numjs/blob/master/src/images/read.js#L8-L26 and https://github.com/nicolaspanel/numjs/blob/master/src/images/read-dom.js#L20-L52 for more info

[nicolaspanel]

Could you check that dtype is set to uint8 and that the underlying datastructure is an Uint8Array?

[nicolaspanel]

Can you share the 4000x4000 image?

[huan]

Yes I had confirmed, it's unit 8.

To reproduce you can just run my posted script, nj.ones can do the same.(memory out)

[huan]

Thank you very much!