I'm using llama.cpp - built last night from head; to do image stuff you have to run a separate client they provide, with something like:

./build/bin/llama-gemma3-cli -m /discs/fast/ai/gemma-3-27b-it-q4_0.gguf --mmproj /discs/fast/ai/mmproj-model-f16-27B.gguf -p "Describe this image." --image ~/Downloads/surprise.png

Note the 2nd gguf in there - I'm not sure, but I think that's for encoding the image.

Image input has been working with LM Studio for quite some time