CHAPTER 2 IMPROVING DIGITAL PHOTOS In GIMP (Web design conference)
CHAPTER 2 IMPROVING DIGITAL PHOTOS In GIMP 2.4, this has been replaced by Save XMP, which can save some but not all of the EXIF information. Full EXIF handling may be restored to the GIMP in a future version. EXIF can embed a thumbnail of the image in the file. Many cameras include this thumbnail, which adds several kilobytes, but most programs don t do anything useful with the EXIF thumbnail. Unchecking Save thumbnail prevents saving this extra information, making the resulting file smaller. Comment is a place to put text you might want to add to an image. You can use this to include your name, a copyright notice, or details about where the photo was taken or what it portrays. GIF and Indexed PNG Quality Settings GIF and indexed PNG quality settings are quite different from JPEG. Since these indexed formats use a fixed number of colors, you can make the files much smaller by reducing the number of colors they use. To do this, you need to know about image modes. Most images edited in GIMP are full-color images, denoted as RGB in the title bar of the image window (back in Figure 1-4). But images that are destined to be saved as GIF or indexed PNG should be converted using the Image . Mode . Indexed… menu item, which brings up the dialog shown in Figure 2-8. Figure 2-8. Convert Image to Indexed Colors dialog When converting an RGB image to indexed mode, you first need to choose a palette, the set of colors that will be represented in the final image. You can choose a predefined palette, such as a web-optimized palette, or one chosen from the custom palette menu; you can choose a black-and-white palette, if you know that the image contains only those two colors; or, the most common case, you can let the GIMP create a palette based on the colors actually in the image. You specify the number of colors, up to a maximum of 256, and the GIMP will try to approximate any other colors that exist in the image by using combinations of the colors in the palette.
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