Halftone Problem.

PT
Posted By
Pastor Thug
Jan 22, 2004
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660
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4
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Trying to get a halftone pattern for output on Canon S900 on transparency film.
Photoshop 7 on a PC.
This is for a photo positive for silk screen priniting.
In the Print With Preview/Screen section, I’ve selected different frequencies from 10 lines/inch to 100 lines/inch and printed with no discernable halftoning happening.
Tried it on all colours CMYK within the Screen section.
Have tried with initial file as an RGB and CMYK. It is only a black and white image, so no colour seperation needed.
Any help much appreciated.
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T
tacitr
Jan 22, 2004
In the Print With Preview/Screen section, I’ve selected different frequencies from 10 lines/inch to 100 lines/inch and printed with no discernable halftoning happening.

That’s correct. Halftoning only happens at the printer if you are using a PostScript printer. With an inkjet printer, you won’t be able to get a halftone this way.

You can use Image-Mode->Grayscale, then Image->Mode->Bitmap and set your halftone parameters when you create the bitmap. Create it at a high resolution–say, 1200 dpi. And expect to be disappointed when you try to burn a screen from the film you get.

Inkjet ink is not opaque, especially not to the intense ultraviolet light used to burn a screen. I’ve tried burning screens from inkjet transparency. the result isn’t pretty.

You can get decent results printing your halftone on a laser printer using UV Ultra-Transparent paper, which is similar to vellum. You’ll get much better results, and save yourself a lot of grief, if you take the image to a service bureau and spend $5 on a page of imagesetter output.

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mohamed_al_dabbagh
Jan 22, 2004
(Tacit) wrote in message news:…
You’ll get much better
results, and save yourself a lot of grief, if you take the image to a service bureau and spend $5 on a page of imagesetter output.

This advise is good.

Mohamed Al-Dabbagh
Senior Graphic Designer
PT
Pastor Thug
Jan 22, 2004
Thanks for the info!

"Pastor Thug" wrote in message
Trying to get a halftone pattern for output on Canon S900 on transparency film.
Photoshop 7 on a PC.
This is for a photo positive for silk screen priniting.
In the Print With Preview/Screen section, I’ve selected different frequencies from 10 lines/inch to 100 lines/inch and printed with no discernable halftoning happening.
Tried it on all colours CMYK within the Screen section.
Have tried with initial file as an RGB and CMYK. It is only a black and white image, so no colour seperation needed.
Any help much appreciated.

L
lindrop
Feb 23, 2004
You can easily create halftone screens by converting to greyscale (i necessary), then to bitmap, use halftone option, whatever lines/inc you require and then convert back to greyscale.

You’ll be changing the document settings rather than playing with prin software though

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lindro
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