Results 3 issues of Vitalii Komenda

File with dicom seg (exported from [here](https://viewer.ohif.org/segmentation?StudyInstanceUIDs=1.3.6.1.4.1.14519.5.2.1.3023.4024.215308722288168917637555384485)) throws an error writing dicom file: unsupported BitsPerSample value [seg-v.dcm.zip](https://github.com/suyashkumar/dicom/files/14110179/seg-v.dcm.zip)

`dicom.ParseFile()` method expands memory a lot. I have a service that gets OOM killed because of this method uses so much memory

Currently only gray colours are possible. Would it be feasible to add RGB support like in pydicom

help wanted
good first issue