All illustrations, whether line drawings or photographs, are considered figures. GSA prefers electronic files but sometimes may have to scan clean hard copy if the files are unusable. To ensure the best possible results, please prepare art for illustrations according to the following guidelines. The following native formats work best, as long as the version of the application is noted and the file is labeled with the correct extension: Corel Draw = .cdr, Canvas = .cvs, Freehand = .fh, Illustrator = .ai, and Photoshop = .psd. If you create either .tif or .eps files, they must be between 300 and 600 dpi resolution. Label figure files with author name, figure number, and extension. Make sure that the hard copy of the figure that you send matches the electronic file of the figure. Files created in any application other than those listed above should be saved as a .tif or .eps. We do NOT accept low-resolution 72 dpi images. Line art with no screening, just black, should be saved as 1200 dpi at 100% size. Line art that has halftone screens or photos should be saved as 600 dpi at 100% size. Photos alone should be saved as 300 dpi (or more). Color images should be saved as 350 dpi at 100% size. All images that have been placed or imported into your figure file must accompany this file on disk (i.e., if you import a photograph into illustrator called photo.tif, you must supply this photo.tif electronic file along with your Illustrator file). Files created by digital cameras are accepted only if they are submitted in .tiff format and are scaled to 100% at 300-600 dpi. (Be sure that your camera is set for highest resolution for best results.) We do not accept 72 dpi photo images. Many graphics files contain unnecessary 'invisible' elements. These are sometimes imported graphics that the creator of the file has traced over and then set not to print. To save out printer time, it is best to delete the unnecessary element rather than just set it not to print. If you would like your figure printed in color, please include a color printout with your submission. The cost is $400 for the first page of color in a chapter and $100 for each additional page of color in the same chapter. (Contact a managing editor for more information.) Authors are responsible for all costs associated with printing in color. Color graphics should be saved as CMYK. Please note: the colors from a LaserWriter or ink-jet printer will not match the colors on the final four-color printer copy. Loose inserts/supplements (maps, seismic reflections, cross sections, etc.) may be included, and may be printed on one or both sides. Authors must provide both electronic file and hardcopy, sized to the exact publication size, and authors must pay all costs for inserts. These costs include press preparation, printing, folding, handling, and inserting. For questions on loose inserts, contact a managing editor. A CD-ROM (that includes maps, seismic reflections, cross sections, etc.) may be included. Authors must provide both a final electronic file in PDF format and hard copy. Any changes that must be made may incur charges. Authors must pay all costs for CD-ROM duplication. These costs include file preparation, handling, and inserting. For questions on CD-ROM inserts, contact a managing editor. Source.