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picture between editing sessions. Each time you edit and resave your photo, you lose a little more picture information. (Merely opening and closing the photo file is perfectly safe.)
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Save your photos in a nondestructive format, such as TIFF, until you re completely
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finished editing the picture. Your photo editor s own format such as PSD in Photoshop Elements is probably an even better choice, because it s designed for full support of all program features. (In some programs, TIFF can t preserve image
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CHAPTER 10: Putting Pictures on the Screen
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layers and other advanced imaging features. Never overwrite your final, edited photo file with the JPEG version. Always keep a backup copy of the photo in the original, nondestructive format. With those warnings out of the way, the next sections show two different methods for creating your JPEG copy and explain the various JPEG options in detail.
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Creating a JPEG Copy of Your Photo
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Many photo editors, including Photoshop Elements, offer a web optimization utility. This tool offers the best way to create a JPEG copy of your image, because you can preview how your picture will look at a different levels of compression. Figure 10.5 shows the Photoshop Elements version of this feature. To access it, choose File | Save For Web. (A couple of the important controls aren t labeled in the dialog box, so use the figure as a map.)
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Some web optimization tools, including the Photoshop Elements Save For Web feature, automatically save your JPEG file as a copy of the original picture. After you save the JPEG file, your original remains open in the program window. If you want to view the JPEG image, you need to close the original and open the JPEG file.
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FIGURE 10.5 Web optimization tools enable you to preview the effect of different amounts of JPEG compression.
Shoot Like a Pro!
If you don t have a web optimization tool, you can use the standard File | Save As command to create your JPEG copy. When the Save As dialog box appears, select JPEG as the file format and enter a file name that distinguishes the image from the original. In some cases, you ll find JPEG options right in the dialog box; in other programs, such as Elements, clicking the Save button opens a second dialog box that contains these options. Figure 10.6 shows the JPEG Options dialog box from Photoshop Elements.
Selecting the Preview check box in the Photoshop Elements JPEG Options dialog box does not enable you to preview the effect of your settings in the image window, as it does in other dialog boxes. The Preview function simply turns on the estimated file size/download time display at the bottom of the dialog box.
Regardless of what path you take to save your file, you ll encounter the same basic file options. The next five sections explain each option.
Quality
This option is key to both file size and picture quality. It controls how much JPEG compression is applied. As discussed earlier, higher compression means smaller files but reduced image quality. To give you an idea of the quality/file size tradeoff you need to make, the three JPEG portraits on Page 32 of the color insert provide an approximation of the FIGURE 10.6 When you use the regular File | Save As screen appearance of an image at three command, the JPEG options may be presented in a separate dialog box, as different Quality settings. Starting with shown here, after you click the Save button. the uncompressed TIFF version of this portrait on Color Page 6, I first reduced the pixel count to 250 300 and made three JPEG copies of the image. For the first copy, I used the Minimum Quality setting, which applies maximum compression. For the second copy, I set the Quality to Medium; for the third, Maximum. As you can see, the Maximum Quality setting produces acceptable image quality. You ll also get a significant reduction of file size even with this amount of compression. My original 250 300-pixel TIFF image had a file size of 222K, for example, and the Maximum Quality setting trimmed the JPEG version to 113K.
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