DTYPE not properly parsed [NotImplemented]

[ggirelli]

See here.

[rbnvrw]

Thank you for your report @ggirelli and sorry for the late reply.
Do you have a suggestion on how to implement this? Otherwise I'll decide what to do with it before the next release (either try to decide from the metadata or leave it as-is).

[ggirelli]

So, the Parser._raw_metadata.SLxImageAttributes.ePixelType tag seems to match the SampleFormat TIFFTag. Hence, possible values should be:

1 = unsigned integer data
2 = two's complement signed integer data
3 = IEEE floating point data
4 = undefined data format

We can combine this with the bits per pixel from the Parser.SLxImageAttributes.uiBpcInMemory tag to build a dtype compatible with numpy. How about something like:

def propose_dtype(parser) -> str:
    bits_per_pixel = parser._raw_metadata.image_attributes[
            six.b("SLxImageAttributes")][six.b("uiBpcInMemory")]
    pixel_type_tag = parser._raw_metadata.image_attributes[
            six.b("SLxImageAttributes")][six.b("ePixelType")]

    dtype_base: DefaultDict = defaultdict(lambda: "float")
    dtype_base[1] = "uint"
    dtype_base[2] = "int"

    proposed_dtype = f"{dtype_base[pixel_type_tag]}{bits_per_pixel}"

    supported_dtypes = ("uint8", "uint16", "uint32",
                        "int8", "int16", "int32",
                        "float8", "float16", "float32")
    return "float64" if proposed_dtype not in supported_dtypes else proposed_dtype

Hope this makes sense 😄