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Indexed PNG only loading R channel

SyndarylSyndaryl
in ShaderMap 4

Hi,

Had something weird crop up, hoping you can help.

I start a new PBR Workflow with a base colour image (a wee little PNG), but it is only loading the R channel in Shadermap, making it greyscale. The map information panel says the Tex Format is 8 Bit 4 Ch, which is correct - but it's an indexed colour image.

The offending image

I've also tried manually adding it to my project as an extra texture, but it still loads as greyscale. What's curious to me is that Shadermap seems to be reading the R channel for values, so it's correctly looking at each index entry and extracting some information correctly. Just not all the information?

Is there a way to get ShaderMap to do more than read the R channel? I'm making a PBR resource pack for a rather hefty Minecraft mod, and there's approximately Too Dang Many block textures for me to be thrilled about manually inspecting each one...

Windows 10 Pro environment, ShaderMap Pro 4.3.8, PBR workflow.

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