image quality guide.book - Kodak

More documents

Recommendations

Info

Chapter 1. Data Preparation Recommendations Source Images 4. Using a photo editing program lighten or darken the image. Note: Using the Color Toolkit, you can correct issues with image density by applying linearization curves to the images and then re-RIPping the images in your data prep software. Plugging in Shadows Because most KODAK VERSAMARK Printing Systems print with waterbased inks, many print quality problems correlate to the ink interaction with the substrate. For this reason, set the ink load accordingly for each print condition. Some jobs require heavy ink coverage while others require less ink per unit area of the substrate. Use the linearization test pattern to determine the best linearization curves for adjusting the contone image data prior to reducing the data to the binary level in the RIP. (See the Color Test Suite User’s Guide for details.) If you select the wrong linearization curves, one of the following problems may result: • Excessive ink prints in the shadows of images, eliminating detail. • Plugging occurs. Darker areas of images blur and highlight detail is lost as a result of ink bleed. This condition worsens at high print speeds because the water has less time to penetrate the substrate before the next color prints. Figure 1.13 provides an example of plugging. Compare the original image with the image on the right, which contains plugging. The defect is more noticeable in the lower half of the image. To correct plugging, reduce the overall image intensity of the job by using the Color Toolkit to reduce the upper ink limit and to determine a new set of linearization curves. Note: If the plugging only appears in certain areas of the image, see “Image Density” in this chapter. 1 - 14 Color Image Quality Guide
Chapter 1. Data Preparation Recommendations Source Images Figure 1.13 Plugging in shadows Original Plugged Black Ink in Highlights You can obtain better image quality can be obtained, especially in flesh tones, when you remove or significantly reduce data in the black channel in the highlight areas of an image. To print the lightest tones, print single droplets of ink that are randomly dispersed over an area of the paper. These droplets contrast well with the paper, especially when the ink is black. Many images contain slight amounts of black data in the highlight or midtone areas. This peppering of black ink can detract from the highlight areas. You can trade the loss in tone caused by removing the black data for an improvement in overall image quality. Figure 1.14 illustrates how black ink in the highlight areas of an image affect image quality. Color Image Quality Guide 1 - 15
Page 1: KODAK VERSAMARK Color Image Quality
Page 4 and 5: KODAK VERSAMARK Color Image Quality
Page 6 and 7: Scope Text Notations Text Notations
Page 9 and 10: Contents Chapter 1. Data Preparatio
Page 11: Figures Figure 1.1 Line art image r
Page 14 and 15: Chapter 1. Data Preparation Recomme
Page 57 and 58: Chapter 2. Printing Recommendations
Page 65: Chapter 2. Printing Recommendations
Page 68 and 69: Chapter 3. Troubleshooting Print De
Page 76 and 77:
Chapter 3. Troubleshooting Print De
Page 78 and 79:
Page 80 and 81:
Page 82 and 83:
Glossary CMYK Cyan, Magenta, Yellow
Page 84 and 85:
Glossary halftone An image where th
Page 86 and 87:
Glossary registration graphics. Pos
Page 89 and 90:
Index Numerics 0-255 patches test p
Page 91 and 92:
Index linearization test pattern 1
Page 94:
0114107-602 0114107-603
show all

image quality guide.book - Kodak

Create successful ePaper yourself

Delete template?

Save as template?