TIFF BitsPerSample tag: Better default behavior

[wolfgang-braun]

I've forked golang.org-x-image to implement this change:

d.features[tBitsPerSample] = []uint{1} // BitsPerSample tag is optional in case the value is 1 - if the tag is missing we assume that the tag value is 1

https://github.com/wolfgang-braun/golang.org-x-image/commit/6b0041c359e77950c205cd39cfde0b9a0482d136

Maybe you want to apply it to your repository.

[hhrutter]

Yes, definitely makes sense.
The spec says that 1 is the default for bits per sample.
This is also fixed in the latest commit 14e74ba2

Thanks for taking time on this 💚