1_as soon as you open your file in CS (photoshop), sharpen it ligthly with smart sharpen to remove the slight blur that raw have. dont over do it.
2_do your darkroom as usual
3_save your original well retouched. flatten a duplicate version (to save time, and easier for the processor) and save as with another name.
4_image size, bicubic smoother (you can go up until 200% in one shot without any problem. if you go at 400% start checking for moire or artifact. If you want to go at 800%, go with a 400%, save it and go back for another 200%, sound crazy but you will get better result.
5_when finish, add some sharpen (again i use smart sharpen, but use the method you like and feel comfortable) maybe some noise, on another layer fill with gray, overlay, 80% opacity. as for the noise, monochromatic, gaussian use the number that give you some light noise at 100% view.
6_Enjoy your new big poster size file interpolated with a expensive software...but without any external expensive plugin that will give you the same result; in 20x time the time it took you with CS alone.
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'immerse your soul in love' - thom yorke
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