i want to print a pano photo that probably 2-3meters long... And i don't want to use home use printer, as the color only using 3 colors + 1-2 black ink. i want those professional use type that has probably 12 colors, so that the colors are correctly calibrate to the photo and also the machine can print the size i am looking for.
You can try Sunshine plaza, there are many shops doing printing there. They print poster sizes up to A0 and they are also capable of printing on banners of lengths up till several metres. Not sure what kinda ink they use but its worth a check. Good luck
why do you assume you'll get proper color reproduction with 12 inks?
12 inks are a hell to profile, and without a proper profile, getting accurate colors are not possible.
then again, unless you're talking about pantone colors with absolute spectral values, there's no such thing as an accurate color.