How to get image that requested scale from 3d slicer (save as NITFI)?

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1

I am researching about segmentation by deep learning via python then I would like to save CT Scan in .png or .jpg for using as input dataset but pictures what I got is bone-scale like the first picture. Have any way I can get picture like the second picture.

The first picture

6_im000056
6_im000056512×512 29.1 KB

The second picture

Untitled
Untitled1370×768 175 KB

2

I would not recommend to export as png or jpg but instead use deep learning frameworks that are properly equipped to work with medical images (and can load commonly used medical image file formats), such as monai.