T-Shirt Forums - View Single Post - converting a b&w photo into a 2 color halftone

Sheepsalt · May 16th, 2008

1. Choose Image > Mode > bitmap

2. choose Halftone Screen from the Use menu; then click OK. The Halftone Screen dialog box opens.

3. For Frequency, enter a value for the screen frequency, and choose a unit of measurement. (for me, using a 160-mesh screen I go 50 Lines per Inch. For 280 or 305-mesh, I use 55 LPI)

4. Enter a value for the screen angle in degrees (56 degrees should work pretty well for what you're doing)

5. Choose the dot shape (I use elipse)

6. Click OK

Now you'll end up with an image with black dots on a white background. If you need to remove the white background, convert it back to Greyscale mode, unlock the 'background' layer (double click on it in the 'layer' pallet), select the magic wand - set Tolerance to '1', uncheck 'Contiguous', and click anywhere on the white background. When your computer is ready, press ctrl-x to 'cut pixels', and the white will all go away leaving only the black dots. Then you can do a color overlay to change the color of the dots if necessary.

Oh, that's for CS2... I'm not sure if everything is exactly the same in other versions, but should be close.

May 16th, 2008	- #3 (permalink)
Sheepsalt T-Shirt Lover T-Shirt Aficionado You can call me: Brian Member Since: Sep 2007 Location: Phoenix Posts: 293 Thanks: 42 Thanked 33 Times in 33 Posts	Re: converting a b&w photo into a 2 color halftone 1. Choose Image > Mode > bitmap 2. choose Halftone Screen from the Use menu; then click OK. The Halftone Screen dialog box opens. 3. For Frequency, enter a value for the screen frequency, and choose a unit of measurement. (for me, using a 160-mesh screen I go 50 Lines per Inch. For 280 or 305-mesh, I use 55 LPI) 4. Enter a value for the screen angle in degrees (56 degrees should work pretty well for what you're doing) 5. Choose the dot shape (I use elipse) 6. Click OK Now you'll end up with an image with black dots on a white background. If you need to remove the white background, convert it back to Greyscale mode, unlock the 'background' layer (double click on it in the 'layer' pallet), select the magic wand - set Tolerance to '1', uncheck 'Contiguous', and click anywhere on the white background. When your computer is ready, press ctrl-x to 'cut pixels', and the white will all go away leaving only the black dots. Then you can do a color overlay to change the color of the dots if necessary. Oh, that's for CS2... I'm not sure if everything is exactly the same in other versions, but should be close.
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