"He who marches out of step hears another drum." ~ Ken Kesey
There are limitations to separating art with a computer/using math.
It will (if programed correctly) accurately break down and even potentially mix the colors, but there is more to separating then just breaking down the colors. For an average print, computer generated seps can potentially be OK. I have seen some that were perfectly fine, but they were nowhere near what we get with the manual separations. And this is after time was spent to adjust the computer generated seps (at least an half an hour to an hour).
there are limitations to what the software can do on it's own and art comes in so many different types that it is impossible to accommodate all the possibilities.
I keep bringing up the fade from yellow to red and how that should be printed with solid yellow on the bottom and gradual fade of red on top (with red starting at the lowest percentage halftone that the particular shop can handle). This avoids the sharp transition lines and shirt or underbase peeking through.
This is just one of about hundred things that separators take into account when working on the art. At this point in time, computers are unable to do that
and even if the algorithms were made to do it, the application of those would never be as precise as what a person can do
... due exactly to the different circumstances having the same formula applied (for example, transition from yellow to maroon would work different from transition from yellow to warm red).
Another example is the compensation for the surrounding color.
485c on medium gray looks downright orange. To keep the overall feel of the image correct, that color might have to be printed with a less yellowish red. If computer separates with the 485 and it is used to blend other colors in the artwork (for example any oranges that might be present), than that 485 shade can not be altered without altering the orange too.
There are many cases like this where human is the only machine that will produce correct results. Again, if close is close enough, computer might do the trick, but this is not the case for our customers.
I am not stating anything new here, this was said by the foremost industry experts and our experience backs it up (and since you probably have no idea who we are and where I am coming from, I'll throw out that we have a shelf full of awards for the work we do including a couple of Golden Images).
This is not to belittle the program you are making, it will be an excellent tool for many, and some might even get push button results they can use, but it will not eliminate the manual separations.
The program that would be capable of of producing human level seps would be incredibly complicated, many hundreds if thousands of times more complex than the chess software that relies on calculation power and very limited set of rules.
And just to be fair, there are also limitations to what is being done by hand. Those seps are not perfect either as the human error is introduced too. Computers can run the same operation time and time again with the same results, we humans tend to forget a step here and there. . . So to recap, this can turn into a very valuable tool, but it will not replace the manual separations completely. It might help them produce faster and even eliminate teh need for them in some instances, but knowledgeable separator will run circles around the computer in most cases. The quality of the final outcome will dictate the rout that can be taken.
If the program worked in the manner that we could actually tell it we want
Pretty much what Pierre said. I will go out on a limb and say there will never be a sep "program"/auto punch that can match hand pulled seps unless the original art is designed around the EXACT colors the program is pulling. I'm attaching a design that our artist just finished up a few weeks back, this is a great example of artwork that this sep program(or any for that matter) cannot accurately pull the PMS colors we are needing to print. The sep program might pull a cyan blue when in fact we need it to pull a pms 320 teal color. The sep program tries to make the pms 320 with a cyan, white, and green color all mixing halftones together when the overall print would look MUCH better printing a straight pms 320 color, not 3-4 colors blending together. The bottom line is unless the auto seps programs can pull the exact colors we are wanting to print on press, then it's still the same ole auto sep program imo and really isn't better then much else. If the program worked in the manner that we could actually tell it we want PMS 109, PMS 320, PMS 7502, PMS 216, etc then the program would pull seps based on the colors we tell it, then it would be special. Until that happens.....all I can say is meh....I would be 100% game to have ddsol or tom do a sep like they are talking about on the attached artwork using their method.... Then we will have our house artist do a set of manual seps and compare the difference. I just don't see the programs pulling the exact colors that we need to print. In theory you should be able to print the main colors of the color wheel to achieve all other colors but on press and in real life shops, that is impossible to achieve..... When dealing with difference opacity inks, different shirt colors, the way colors blend on press, etc the real world doesn't lend itself to auto seps, but again this is just my opinion. All the math in the world will not solve the problems we run into on press, bottom line.
Sorry guys. As we speak scientists are working on math to solve everything, and I mean everything. Look for "Theory of everything". I can damn well solve this simple thing.And don't say never. There already is. However, my poor sep program cannot possibly be expected to read you mind. You'll have to tell it you want 320 or 319 or 1782 or whatever it is you think is "the cool color du jour". You get what you want. My program doesn't care either way. It will use any color you throw at it, and as many as you want (except webgl won't allow more than 10 or 12, which you'll never need anyway).QuoteIf the program worked in the manner that we could actually tell it we wantYou can. It's already there. Actually. You just can't delete the auto-suggest colors yet.It's not done... except for the engine, which is done and extremely good.I sepped your image. I didn't change anything. 5 colors it came up with. (You should know it tries to use a few inks as it can get away with. I will add the "High end" target later on. In the mean time, you'll have to add your own PMS colors. You can.)Remember, this thing is now just a test. But it will be a product. It isn't. But it will be. It can separate, yes, but it can't output the seps. So, no I can't make films out of your cool picture. Just on-screen previews for now... sorry. BUT, you can zoom in SO FAR that you can see what dot goes where, and you can see ink opacities, because you can see one dot through another. So, that's pretty close to proof, I'd say. Give it a shot instead of giving me opinions about stuff you didn't look at!C'mon peeps! You don't have to install ANYthing! Just click this link. Try it! Try it! Just go and try it! See how cool it is! Really... you really gonna say it don't work when you didn't even peek? My my... then there's not anything I can say, not even using 1000000 words!Btw, you'll need the image as a PNG (never save as JPG! It's lossy!)But attachment size is too small... It won't upload. Grmbl.
I mean, have you made any programs lately? They done a pretty bang up job for the paper printing industry. But, maybe Screen Printing falls in the Mystic Voodoo category.
I think it's a long shot trying to have a program that can account for shirt colors, the way inks blend, etc
For instance, does your sep program account for the screens that are first in the print order having more dot gain then the screens last in the print order
I just can't fathom,how any auto program can account for everything for every shop out there