114 CHAPTER 3 INTRODUCTION TO LAYERS Figure (Make a web site)
114 CHAPTER 3 INTRODUCTION TO LAYERS Figure 3-40. The dialogs involved with saving a GIF animation First is the normal Save a Copy dialog; type a file name ending in .gif here, or use the menu to select the GIF file type. This leads to the GIF Export dialog. It reminds you there are multiple layers, and asks you whether to merge all the layers into a single still image or create an animation. Merging is the default; you will have to check the box for animation each time you save, unfortunately. The GIF Export dialog is also the one controlling conversion to indexed mode. You can make your animation file smaller if you convert the image to indexed mode first, as was discussed in Chapter 2. If you ve dragged any of your layers beyond the image borders, you may get a warning like the one shown. It doesn t do any harm; if you see this, just click OK. Finally you get the important dialog: Save as GIF. This offers several animation options. Loop forever is on by default. You can make your animation play once then stop, or loop back to the beginning once it gets to the end. Delay between frames controls the speed of the animation. The default is 100 milliseconds (1/10 of a second), but you can make the animation run slower or faster if you choose. Frame disposal can usually be set to I don t care, as long as you ve made each frame opaque, as in this example. If you do care, the choices are Cumulative layers (combine) and One frame per layer (replace). This option only makes a difference if you make an animation with transparent frames: it lets you control whether previous frames are erased before drawing the next.
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