i wrote that last stuff before you commented. so, it wasn't in response to you at all. we have no arguement. but, you'r view is a little too simplistic. there are distinct differences to these different printing PROCESSES, but, yes, they are ALL printing - aka - ink placed on paper. in that way, they are all apples. yes.
nest thing you know, you're going to say that letterpress is the same as offset is the same as ss, etc. i say there is a big difference. but it's still printing. hell, a potato srtamp is the same if you get THAT simple.
again - there is confusion. "spot color" work is also rather different from full bore 4-color process work. spot color is way closer to the way ss works.
seripop - the way you folks work with ss is always transparent. that's actually not typical. most people work with opaque inks (aka - inks that you can use to cover up the ink underneath). i always seem to have problems with requesting "transparent" inks from my ss printers and then they just thin down their inks that have a white base. it ends up creating a 'frosted' look to the overlapping ink. in other words, it's just a pisscoat of opaque ink. that's not a transparent ink.
most ss uses the opaque inks because you can get such beautiful rich delicious flat color from it. it's tough to do that quite as well with offset inks. colors are all built with four color process. it's almost impossible to get a really good orange with offset ink for instance. too much mixing and even the paper color leaks through and changes it.
spot color usually utilizes a pms match (a copyrighted ink matching system that emerged in the early 60's). pms ink colors have real problems, too. there's a whole lot that you can't do with them (the spectrums are peculiar. i once had the company explain how they actually were selected and it was extremely weird and arbitrary and lame.). but, the way the solid pigments look when it hits the paper is far richer than the 4-color build made with transparent process inks. also, pms colors are transparent, too, so you can mix them on the paper to create interesting (and sometimes unpredictable) colors as well.
one last thing... i don't think this is a very good poster. it's basically a rip. too close for my tastes. and i did it myself.
like i said, i never thought these posters would have any lifespan outside of initial use as an ad/tour blank. the idea that it's being discussed here fifteen years after it was torn down off the telephone poles is charming.
oh, and yes, i DO know that you can use transparent inks on silkscreen - but why? those opaque colors are so wonderful! you can't do decent opacity with offset like that. the grit in the inks are too caorse to use on an offset press. that's why they use such runny transparent bases - it works on those fountains and chemistry with high speeds and accuracy while still wet (all colors go down at one time).
besides, try to do a run of 20,000 silkscreen posters using 4 transparent colors and keep the unit cost under two bits. offset is great.
this isn't a contest. silkscreen and offset are both worthy and wonderful. but, you have to admit, they ARE different, right? i'm just trying to help out those guys that are unfamiliar with the process that you can handle it if you just don't overthink it. in fact, once you master the intricasies of offset, you can do damn near anything with graphic design.
the same goes in reverse, you'd be surprised how many folks who do offset exclusively just have no idea how to do ss and are totally baffled by it. it just takes some doing and some familiarity.
richie, yes, you win. you're right (whatever your point is). but it's different, just the same. it's not apples and oranges, it's more like red delicious versus golden delicious. still apples, but different.
actually, it's not very much like screen printing at all. even though it's one color on paper at a time, that's about all the two mediums share.
i think rather than contrasting the two, jit's most important to remember that offset uses TRANSPARENT inks (that is, they don't use a white base like smost ss ink. it's clear and you can see through them like glass when they dry.) if you can just remember that one point, then setting up the artwork gets tremendously easier.
also, remeber that computers really seem to hate the idea of overlapping inks. that erases about 90% of what offset can do.