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Full Color Prints (4 Color Process)

 
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Old April 3rd, 2007 Apr 3, 2007 5:24:28 AM -   #1 (permalink)
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Default Full Color Prints (4 Color Process)

Hello All,
I have my spot color printing down and now I am trying to learn the art of full color using CMYK. I am using photoshop cs2 to turn my full color image into CMYK. The basic process as far as I know is to convert your document to CYMK mode. Then change your document to bitmap and add your angles and halftone shapes. The part I am stumped at is when I am in CMYK mode I cannot access bitmap mode. It is grey and not clickable... How do I covert each layer to bitmap in this case?
 
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Old April 3rd, 2007 Apr 3, 2007 8:05:53 AM -   #2 (permalink)
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Default Re: Full Color Prints (4 Color Process)

If your working in Photoshop your working with raster images. Your already a bitmap.
Essentially when you convert the image to CMYk you have created your seps.
Switch to the channels palettes. Those 4 channels are your seps.

Printing as is will get a good/decent result. Editing the colors before converting to cmyk and adjusting the various cvhannels will result in a better print. This takes time and trial and error on your part to get a good workflow.

I would sugest reading up as much as possible on 4-clr process and textile printing.

www.usscreen.com articles section has some good info.
http://screenprinters.net/articles/
M&R Companies, Amscomatic, Nuarc artiles has some good info from Mark Coudray
The M&R Companies :: Articles & Tips
 
Old April 3rd, 2007 Apr 3, 2007 8:10:22 AM -   #3 (permalink)
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Default Re: Full Color Prints (4 Color Process)

Quote:
Originally Posted by Fluid
If your working in Photoshop your working with raster images. Your already a bitmap.
Essentially when you convert the image to CMYk you have created your seps.
Switch to the channels palettes. Those 4 channels are your seps.

Printing as is will get a good/decent result. Editing the colors before converting to cmyk and adjusting the various cvhannels will result in a better print. This takes time and trial and error on your part to get a good workflow.

I would sugest reading up as much as possible on 4-clr process and textile printing.
Yea but to create a screen I am not going to print directly from the channels palette.... I have to create a halftone screen... and from what I know you do that through the bitmap mode...

Last edited by Solmu; April 4th, 2007 at 06:26 AM.. Reason: fixed quoting
 
 
Old April 3rd, 2007 Apr 3, 2007 8:22:46 AM -   #4 (permalink)
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Default Re: Full Color Prints (4 Color Process)

Break apart the channels. This will give you as separate file rfom each channel. Youll loose the chanel name yet they are still in order.
make a copy of the file and break that one apart. This way you can revert back to the original one so you can rename the channels the correct name. Cyan, Magenta, .........
 
Old April 3rd, 2007 Apr 3, 2007 9:44:48 AM -   #5 (permalink)
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Default Re: Full Color Prints (4 Color Process)

Quote:
Originally Posted by Fluid
Break apart the channels. This will give you as separate file rfom each channel. Youll loose the chanel name yet they are still in order.
make a copy of the file and break that one apart. This way you can revert back to the original one so you can rename the channels the correct name. Cyan, Magenta, .........
How exactly do you do that? Like step by step. (for all the special people like myself)
 
Old April 3rd, 2007 Apr 3, 2007 10:42:32 AM -   #6 (permalink)
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Default Re: Full Color Prints (4 Color Process)

Sorry for a newbie question. I know what CMYK is, but whats printing CMYK? Would you lay down Cyan, than Magenta to get the resulting color?
 
Old April 3rd, 2007 Apr 3, 2007 10:48:29 AM -   #7 (permalink)
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Default Re: Full Color Prints (4 Color Process)

Quote:
Originally Posted by TeddyRocky
Sorry for a newbie question. I know what CMYK is, but whats printing CMYK? Would you lay down Cyan, than Magenta to get the resulting color?
yes exactly. You can create a full color image through using Magenta Cyan Yellow and Black.
 
Old April 4th, 2007 Apr 4, 2007 4:48:51 AM -   #8 (permalink)
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Default Re: Full Color Prints (4 Color Process)

so how exactly to you create halftones for each of your colors that are small or big enough (high quality) for a t-shirt print?
You separate your colors in photoshop and then what?
 
Old April 4th, 2007 Apr 4, 2007 4:54:12 AM -   #9 (permalink)
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Default Re: Full Color Prints (4 Color Process)

On the channels docker there is a little button/flyout. open thsi and youll see the break apart channels command.
 
Old April 4th, 2007 Apr 4, 2007 5:23:22 AM -   #10 (permalink)
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Default Re: Full Color Prints (4 Color Process)

and after the break apart? Does that turn it into halftones?
 
Old April 4th, 2007 Apr 4, 2007 5:29:41 AM -   #11 (permalink)
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Default Re: Full Color Prints (4 Color Process)

Its greyscale image. You will need to print to a postscript printer or rip softeware to specify halftone/dot shape, size and angles.

If you plan on converting the plates to bitmaps to assing mock halftone patterns and print to a normal printer you may have issues with the prints lookng correct. This methond of creating halftones that will print on any printer is not the best option for printing 4-color process prints.
 
Old April 4th, 2007 Apr 4, 2007 5:33:07 AM -   #12 (permalink)
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Default Re: Full Color Prints (4 Color Process)

Quote:
Originally Posted by Fluid
Its greyscale image. You will need to print to a postscript printer or rip softeware to specify halftone/dot shape, size and angles.

If you plan on converting the plates to bitmaps to assing mock halftone patterns and print to a normal printer you may have issues with the prints lookng correct. This methond of creating halftones that will print on any printer is not the best option for printing 4-color process prints.
Well right now that is my only option. What exactly will be going on? and what is the best way to go about that?
 
Old April 4th, 2007 Apr 4, 2007 8:29:04 AM -   #13 (permalink)
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Default Re: Full Color Prints (4 Color Process)

I dont know as I do not use that process. I output directly to a Imagesetter via RTI rip software.

Only thing I can say is to test.
 
Old April 4th, 2007 Apr 4, 2007 8:46:06 AM -   #14 (permalink)
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Default Re: Full Color Prints (4 Color Process)

I have heard of fastfilms. A plug-in for photoshop that does your separations and halftones for you.. But that program is like 1,000 dollars. I know I can do it myself but cannot find myself some good directions to do it. Does anyone know of any good resources besides spreenprinters.net????

Or could someone just tell me how to do it>?
I greatly appreciate everyones help!
 
Old June 30th, 2007 Jun 30, 2007 7:07:55 AM -   #15 (permalink)
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Default Re: Full Color Prints (4 Color Process)

Quote:
Originally Posted by Fluid
...If you plan on converting the plates to bitmaps to assing mock halftone patterns and print to a normal printer you may have issues with the prints lookng correct. This methond of creating halftones that will print on any printer is not the best option for printing 4-color process prints.
I can relate to this. I use this mock halftone method (bitmap conversion) to print halftones to a regular inkjet printer pretty successfully for spot colour designs that have tones - because the halftone areas are not the entire design - so the moire is not (as) obvious (although, it is still there).

BUT, I just tried to use the method to separate a CMYK 4 colour process job - just to see if it would work. The results were not good.

Unfortunatley, this process does not work well for this purpose. What happened was the output films had problems with moire (the checkerboard variety). I think this is because the bitmap conversion method works in 1 inch squares while converting to halftones and thats how it prints (WYSIWYG) - whereas the procedure done via postscript printer / image setter considers the entire design when creating halftones at print time.
 






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