JPEG Export Dialog Box
The JPEG export bitmap dialog box is opened by selecting JPEG as the exported file format from the Export dialog box. It allows the setting of the size/resolution of the exported bitmap, the area to be exported and the 'quality' of the final bitmap. You can use the Export dialog box to preview the bitmap using different settings. This lets you change, for example, the number of colors and see how this affects the look of the bitmap and its file size. For details of how to create a JPEG file, see Creating JPEG files.
Export/Apply Button (see Note)
Exporting from the Bitmap Gallery
If you export a bitmap using the Save button in the Bitmap Gallery, only one tab will appear because you can only change the basic bitmap settings. You cannot (for example) resize it. If you need more options, select the bitmap in the document and use Export on the File menu.
Note
This button reads Apply when setting options in the Name Gallery (because you are setting options prior to Exporting a sliced image). Otherwise it reads Export.