I have constructed a Mandelbrot image using my own small python script. I am toying with the idea of taking it to a shop to have it printed on a 50x70cm poster to hang on the wall.
I know nothing of printing, and would like to not ruin the result too much in my ignorance.
Below is the picture I've made (it's somewhat low resolution here because of file size limitations; as it is digitally constructed, naturally I can make it in any resolution I want, and I suppose that when I get that far, I'll look at the prices for 150 vs 300 vs 600 ppi to see if I care enough to pay for it).
I like that it is mostly black, and the I like the (almost) monochrome blue. I am somewhat satisfied with the level of banding (always an issue with dark colors). I like the colors as I see them on my screen. I think I like the off-center composition, although I might move the motive a little bit to the left.
However, I am uncertain how much of it translates to a poster. Should the curve be made thicker, or brighter, or both? I am afraid that especially the small details (all the lightning-like branching, and the smaller copies of the bulb) may become nearly invisible, but on the other hand, turning them up will probably give me banding elsewhere.
And what can I expect for the color? Heck, the colors looks different between my image viewer and my internet browser; the browser shows a clear blue, while my image viewer shows a more purple color. I have no idea what a poster printer might do.