update read_data to transform uint8 data

[HaleySchuhl]

Describe your changes
Transform uint8 type Hyperspectral images, like those coming from the Rayn camera system, and make them compatiable with hyperspectral functionality downstream.

Type of update
Is this a:

• Bug fix
• feature enhancement
• Work in progress

Associated issues

• How to handle uint8/[0,255] format HSI?  #1599

Additional context
Add any other context about the problem here.

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• PR functionality reviewed in a Jupyter Notebook
• All tests pass
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• Documentation tested
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• PR approved

[deepsource-io]

Here's the code health analysis summary for commits 22afbd0..54a1bcd. View details on DeepSource ↗.

Analysis Summary

Analyzer	Status	Summary	Link
Python	✅ Success		View Check ↗
Test coverage	⚠️ Artifact not reported	Timed out: Artifact was never reported	View Check ↗

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