how do you edit a large image?

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D4NM4N

ive tried canvases but you cant make them bigger than the screen, ive tried buffers but they don exist in max.

so, how does someone perform pixel ops on a large image?!?
Speed isnt an issue as its for rendering not realtime.

isnt there something like:
writepixeltoimage (timage,x,y,argb)

i find it a bit dissapointing if there isnt some way of doing something as 'standard' as this.