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Topic: Transparency question  (Read 954 times)
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« on: January 11, 2005 08:17:53 PM »

I bought my Speedball kit months ago but I'm finally ready to bite the bullet and make my first silk screen.  I've looked through the threads and got a lot of great information but I'm not quite sure about the transparency in the photo emulsion method.  Is my transparency supposed to just be totally clear and black or are gray areas ok?  Is there no shading in screening and I'm just supposed to have black and white areas in my photo program?
Thanks a bunch!
-Cindy
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leslie451
« Reply #1 on: January 14, 2005 06:52:18 PM »

If your image has grey, then it's best to make the image into a halftone before printing it. The dot pattern of the halftone will be dense in some areas and sparse in others, and that's what creates the grey when printed.
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« Reply #2 on: January 15, 2005 09:05:17 AM »

Hmm, I tried converting to half tone and got these HUGE circles!  I think I'm going to try and change the contrast and take out the gray.  Thanks for your help Smiley
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leslie451
« Reply #3 on: January 15, 2005 05:29:18 PM »

Ooops, I left you with half an answer. I apologize for that. Are you using Photoshop to prepare your images? If so, I can give more info that will hopefully help. Keep in mind that I use this method for all my halftone images that I plan to screenprint, but I don't actually use transparency paper at all and the mesh I use for my screens is either 10xx or 12xx, so I don't know what type of results you'll get.

First off, don't use the halftone listed under filters, as it's not a proper halftone.

Once you've got your image in black and white (and grey), change the image mode to bitmap. (You may need to change the mode to greyscale first, if it's in RGB or CMYK, and then change it to bitmap.)

When you choose the bitmap mode, a dialogue box will pop up with settings for the halftone. Again, these settings work for me using regular paper that I create a makeshift (and much cheaper) transparency from, and typically 10xx mesh fabric.

I use the following setting for halftones:
Output: 150 pixels/inch
Method: Halftone Screen

When you choose Halftone Screen as your method, you'll get another dialogue box for Halftone Screen settings. I use these:
Frequency: 30 lines/inch
Angle: 25 degrees
Shape: Round

I never change the frequency, but I vary the angle from anywhere between 20 - 30, depending on the results.

Hopefully that a lot more help to you.  Smiley
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« Reply #4 on: January 18, 2005 02:51:04 PM »

Thank you SO MUCH for your help!  I'm not using Photoshop but I'm using a program like it so hopefully it'll work the same way.  Cross your fingers.  Your explanation makes way more sense!
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leslie451
« Reply #5 on: January 18, 2005 05:45:27 PM »

I'm glad part 2 of my explanation made more sense. I hope it works out for you.
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