Printwear

February '19

For the Business of Apparel Decorating

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5 2 P R I N T W E A R F E B R U A R Y 2 0 1 9 4-COLOR PROCESS CREATING A WHITE PLATE FOR CMYK W hile in the Lab mode, it is a good time to create a base white or wet white. Select the Lightness channel, go to the top right corner of the Chan- nel window, click the Menu icon, and select Duplicate Channel. This will open a window where you can then name the channel, (White Base or Wet White), and check the 'Invert' box. At this point, a channel, which looks like a reversed film positive, is created. Double click on the channel and make the color white, select 'Spot Color,' and set the opacity to 80 percent for an underbase white or 25 percent for a wet white. For viewing purposes, create a solid 100 percent black chan- nel to represent a black T-shirt. Place the channel under the new white channel that was created. This will give the artist an idea of what the printed white plate will look like on a T-shirt. Highlight the white channel and select "curves" or (command M). In the window, drag the left arrow to the right 8–10 percent, to simulate a choke. For a wet white, drag the arrow to the right until the color is only in the areas of the image that are white and pastel colors. Make any adjustments, such as color balance, saturation, lightness, or filters now. Adjust the design with the curve to create nice transitions in the mid-range areas. ask if you could get the original design in RGB. If that is not possible, open the im- age in Photoshop and change the mode to RGB. You should not see any change in the appearance of the file. 3. ESTABLISH THE WHITE AND BLACK POINTS This is especially important if you receive a file from a customer. This action can be done quickly by converting to Lab mode. In the lightness channel, select Levels (com- mand L). Move the levels to arrows in the preview box until you have a full black area and a full white area. This step is also de- pendent on the artist's eye. For example, if the design is a very pastel watercolor replica- tion, the design may not need the full tint/ shade values. 4. USE THE CORRECT COLOR DATA For color-correct printing, this step is the most important link in the chain. Photo- shop allows the user to create custom color settings for CMYK. Photoshop's default setting is SWOP (process for paper). If this White plates are important for best duplicating image colors.

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