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For example, if we're testing a Canon printer, we print on 4" x 6" Canon Photo Paper Glossy. We print the Granger chart and the Parrots picture on a 4" x 6" sheet of standard glossy photo paper matching the printer's manufacturer. We then send the document to the printer via WLAN (wireless LAN) to print.
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The printer settings we use are as follows: We connect the printer via Wi-Fi to the same wireless network as our test computer. The Parrots picture provides a more realistic representation of the printer's performance when printing a photo. The presence or absence of this zig-zag line in a display or printed image is a tell-tale sign of how wide a printer's color gamut is. This zig-zag line roughly denotes the most-saturated tint of that particular hue. The characteristic that sets it apart is the presence of a bright zig-zag line across all the colors at various heights.
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Like HSL charts found in many digital art programs for precise color-picking, the Granger chart is a picture that displays a very wide array of colors, organized by the color's hue from left to right and how light or dark the color is from top to bottom. To evaluate a printer's color gamut, we use the 'Parrots' picture as a sample and the Granger chart (sometimes referred to as the "Granger rainbow").
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