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Photoshop in Focus

Although the general rule of thumb is that most inkjet printers reach maximum quality at 240 dpi most of the time, you can find your own printer's best balance between quality and file size.

1.
Open a new Photoshop document. Make it RGB, filled with white, 6 inches wide, and 1 inch tall at 200ppi.

2.
Select the Gradient tool from the Toolbox. In the Options Bar, choose Linear and the Spectrum gradient.

3.
Drag from the upper-left corner of the document to the lower-right corner to create a diagonal gradient: red-magenta-blue-cyan-green-yellow-red.

4.
In the Print with Preview dialog box, uncheck the Center Image box and input a top margin of 1 inch. Leave the left margin as it was set.

5.
Print the gradient on glossy paper, using your printer's highest quality output settings.

6.
Open another new Photoshop document, identical to the first but with a resolution of 240ppi.

7.
Drag an identical gradient from the image's upper-left corner to the lower-right corner.

8.
In the Print with Preview dialog box, again uncheck Center Image, but this time make the top margin 2 inches.

9.
Reload the same sheet of glossy paper into the inkjet printer and print the second document.

10.
Create a third new document at 300ppi and fill it with a gradient. Print the third gradient on the same sheet of paper, 3 inches from the top.

11.
Print a fourth gradient, 400ppi, 4 inches from the top of that same sheet of paper. You should have a single sheet of paper with four near-identical gradients, as shown in Figure 6.21.

Figure 6.21. The gradients are identical, but the print quality can differ.



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