SKY (Change color of line art)
 

TIP:
PhotoShop 4 gives you a number of ways to edit the gradient tool.
The color of the lines that form the sky, are changed to a gradation of blue. To do this, I first made a selection of the sky with the line art layer selected and preserve transparency checked (remember, the line art layer has black lines and a transparent background). I then chose a light blue for the foreground color and a medium blue for the background color, then double clickedthe gradient tool and set it to foreground to background. With the sky selected, I then drag with the gradient tool from the bottom of the sky to the top, holding the shift key to constrain vertically. Since preserve transparency is checked, only the lines are filled with the color.

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