CHAPTER 2 (Web design) IMPROVING DIGITAL PHOTOS Interlace
CHAPTER 2 IMPROVING DIGITAL PHOTOS Interlace is like JPEG s progressive option: it makes images load in a different way, so that someone viewing them in a web browser can see more of the image before it has loaded completely. GIF comment is like a JPEG comment, a place where you can store copyright information or details about where or how the image was taken. (GIF doesn t include EXIF, so the GIF comment is the only place such information can be recorded.) Animated GIF Options controls ways of making an animation, as you ll see in Chapter 3. Saving an RGB image as PNG will save it as a full-color PNG. If you want indexed PNG, you must convert the image to indexed mode before saving it. That said, the Save as PNG dialog offers yet another set of options. Interlacing is similar to GIF s interlacing or JPEG s progressive options. Save background color relates to images with transparency. Since not all web browsers handle PNG transparency, those that don t can use the GIMP s current background color instead. Save gamma saves information about your monitor. Some viewing programs can compensate for this, and try to adjust the PNG image so that it looks the same on the viewer s monitor as it did on yours. (Most viewing programs probably won t get this right, so for most people, there s no point in checking this option. It increases file size very slightly.) Save layer offset is only meaningful if you re saving a layer that has been moved relative to the rest of the image (you ll learn about layers in Chapter 3). Most viewers probably won t handle this correctly either. Save resolution records the current resolution (dots per inch or dpi) of the image, and is only useful if you re trading files with someone whose software cares about dpi. Save creation time records the time the image was last modified. Save comment is like the GIF or JPEG comment, but alas, you can t set it in this dialog. Save color values from transparent pixels is similar to Save background color, intended mainly for browsers that don t handle transparency properly. Finally, PNG offers a settable Compression level. Unlike JPEG, PNG s compression is not lossy. The only disadvantage to using high compression levels is that it will take slightly longer to save the file. Most of the time difference happens when saving; it doesn t take a viewer much longer to uncompress a highly compressed PNG image. So usually it s best to use the largest amount of compression possible.
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