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This
recorded action will do almost all of the steps it takes to do this
line conversion.
With the gray tone area that is to be changed to line art selected,
start this action and in seconds it is converted to line art then
back to Grayscale mode, ready to move back into the main file.
The
only problem with this action is that it will always make line art
that is 20 lpi, 90 degrees for angle, and line for shape. To use
other setting for the Halftone pattern you could stop the action
at that point and put in new settings, or you could make multiple
actions, each with different pattern settings and assign each action
an "F" key.
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The final details
will be added with Photoshop 5.5 working in Grayscale at 600ppi. The Mode
will be changed to Bitmap, only after all the work is finished.
The first thing I will do is add line shading to create a sense of lighting.
In a traditional line drawing the shading would be added by placing line
after line next to each other to create the illusion of different shades
of gray. That can take a lot of time and patients. With Photoshop there
is a better way-here's how.
1. Make a selection of the area where you want to add shading.
2. Add a new layer and paint the selected area with shades of gray to
achieve the lighting effect that works. These are blended shades of gray
at this point (as in a photograph), it will be changed to lines later.
3. To change the shaded area to line art, it has to be changed to Bitmap
mode. Since we don't want to change our original Grayscale file to Bitmap,
the shaded area needs to be put into a new file.
4. With the Shaded area still selected, copy the selection (Command-C)
and make a new file (Command-N), accept the settings of the new file by
pressing return. Photoshop uses the attributes from the last copied item
when making a new file. Now paste (Command-V) the shaded area into the
new file. It should fit up to the edges of the new file.
5. Now convert the Grayscale image to Bitmap mode (Image/Mode/Bitmap...).
6. A dialog box appears for Bitmap options. Leave the resolution alone
(It should be the same as the file your converting, in this case 600ppi)
and choose Halftone Screen for Method. Click OK.
7. Another dialog box appears for the Halftone Screen options. Choose
the number of lines per inch/cm for Frequency (14 to 22 usually works
for me). Choose the angle, anywhere between 180.0000 and -180.0000. Choose
a shape, I usually use line. Click OK.
8. Switch the mode back to Grayscale (Image/Mode/Grayscale...), a dialog
box appears, accept "1" for size ratio by clicking OK.
9. Now we need to delete the white pixels, leaving only the black lines
on a transparent background. To have transparency the "background"
has to be changed to a layer. Change it to a layer by double clicking
on the "background" in the layers palette and in the dialog
box that appears, change the name (the default Layer 0 is fine) and click
OK.
10. Double click on the Magic Wand Tool to get the options for that tool.
The options should be set to "0" tolerance and all boxes should
be unchecked.
11. Click a white area with the Magic Wand Tool-all the white pixels should
be selected. If all the white pixels weren't selected, choose Select/Similar.
13. Press Delete to remove all the white pixels and deselect the selection.
14. Drag the line art back into the original file and position it, then
you can trash the layer you used to make the gray shading.
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