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8 discusses some of the many ways to turn a full-color digital photo into a black-and-white picture. One method is to convert the photo to the Grayscale color mode, which combines the red, green, and blue color channels into one, leaving you with an image that contains just 256 colors (black, white, and shades of gray). For reasons discussed in 8, I don t use this method for important blackand-white conversions because it doesn t offer the best control over the conversion. In addition, most printers do better with RGB images than Grayscale pictures. But Grayscale mode does have an advantage over RGB in terms of web use: With only one channel and 256 colors, Grayscale images have a much smaller file size than RGB photos. If you read the earlier section that discussed the GIF file format, you may remember that GIF also is limited to 256 colors, which may have you wondering whether GIF is a good match for grayscale pictures. The answer is, yes, it can be. But depending on the picture, JPEG may still offer a better balance of file size and picture quality. When you save to the GIF format, you can specify how many image colors you want to retain, saving anywhere from 2 to 256 colors. At the full 256, a GIF image may be larger than a JPEG file, even if you apply minimum compression to that JPEG file. To achieve a smaller-than-JPEG file size, you may need to strip the photo to so few colors that you see posterization, as illustrated by Figure 10.9. These examples illustrate the screen appearance 16-color GIF, 21K Medium Quality JPEG, 19K of an image that s approximately 300 pixels square. The left image, which I saved at a Medium JPEG Quality setting, has a file size of 19K. To create a GIF image of the same size, I had to reduce the picture to 16 colors. As you can see from the inset areas, this FIGURE 10.9 To reduce the GIF image to the same file size as a Medium Quality created significant JPEG, I had to take the picture down to 16 colors, creating posterization. posterization in some areas of the picture.
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CHAPTER 10: Putting Pictures on the Screen
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The only way to know for sure whether GIF or JPEG offers a better solution is to experiment. I suspect, however, that you ll prefer the results that you get with JPEG more often than not.
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You re no doubt familiar with the three most common screen uses for digital photos: posting them on a web page, attaching them to e-mail messages, and adding them to a multimedia presentation. But you may not be aware of the following electronic avenues for sharing and enjoying your pictures.
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You can create and store online photo albums for free though sites such as Ofoto (www.Ofoto.com) and Shutterfly (www.shutterfly.com). These sites provide the software you need to upload your photo files and arrange them into albums. After creating an album, you can send e-mails inviting other people to view the pictures and order prints from the site. You can limit access to your photos only to those people, which is a nice security feature. Although you don t pay anything to post albums, I urge you to buy pictures every now and then to help keep the free photo-sharing option viable for the companies that provide the service.
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Don t mistake an online photo-sharing site as a storage bin for your image files. If the web site goes out of business or has technical problems, you could lose all your pictures. Maintain your photo archive on your own system, CDs, or other storage media. (See 1 for archiving advice.)
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