Azure compatible Image processing with PowerShell

Question

I need to process images uploaded to sharepoint site with az Azure runbook. The main tasks would be:

• Downscale
• Reduce colors to 128 or less
• Enumerate the image pixels and return their color value

The result should be a pixelated version of the original image and an array of all pixels with color value.

For the conversion, locally, I would use ImageMagick, but I didn't manage to upload that library as Azure module. I found this: https://docs.microsoft.com/en-us/previous-versions/windows/desktop/wiaaut/-wiaaut-imageprocess

This is working in Azure as well, but I found very little documentation about the filters. Is it possible to reduce the number of colors in the "convert" filter?

Also, I didn't find any way to enumerate the pixels. Is there an other library that works in Azure powershell and can give this information?

Or, is there a more suitable library that I could use?