Robin Good's insight:
Pics.io is free online 32-bit basic photo editor that works also with very large images. It runs in your browser, is fast and you can see edits and adjustments in real time.
Image editing features include cropping, rotation, bright/contr, saturation, curves, invert, temperature and a few effects.
You can open any .jpg, .bmp and .png image and save your edited work in .png.
Key strengths for Pics.io are speed, extreme ease of use, and a thin command set useful for all basic image editing work.
No need to register, download or login. It works instantly.
Free to use.
Try it out now: http://edit.pics.io/