Image format indexing

I just wanted to ask which Image Format can be indexed by Google?

What do you mean by asking this question? Because i don't understand... Which mean "indexed by Google" for you? You want to be here: "www.google.com/imghp"? - If yes, there is many image formats:

BMP GIF JPEG PNG WebP SVG

Click to expand...

- If you want to be on the first 10 images, you should use specific anchor text and your website should be great! I'm always in the top 3 images, because each of my website is seo optimized.
Regards...

Any image will be indexed by Google, specially if you throw some backlinks.
Now the algorithm can detect if it's unique or not, you can use some watermark in order to make it "unique" or hard to detect the original image.

And don't forget about proper alt text, small + for you , but you now, everything matters.