Rust open png always as grayscale

1

I am aware of png - Rust
and the decoder example there.

Is there a way to tell Rust to always open the image as grayscale? I'm trying to avoid complicated modes like Indexed

2

I'm now convinced there's no obvious way to do this via png crate, and the simplest solution is to use the image crate: image::DynamicImage - Rust

3

I’m not aware of a way to force it to load as grayscale initially either. I’ve been using to_luma to get a GrayImage, which could be useful if you don’t want to introduce colours later:

1 Like
4

Your solution is definitely better, as mine provides a DynamicImage, whereas yours provides a GrayImage

5

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