Many scientific graphics are vector based, such as data plots and visualizations generated in Origin, Matlab, or Excel, chemical structures created in ChemDraw, and schematics drawn in PowerPoint or Adobe Illustrator. When submitting your figures for publications, you can choose an image format such as PDF, EPS, or Adobe Illustrator (*.ai) to preserve the vector graphics in the figures. Here are 2 reasons for doing that.
1. Vector graphics looks much better than bitmap images in online PDF files you download from journal websites. This is important because most people read your publications through these PDF files. The high-resolution bitmap images you submitted for print are converted to low-resolution, low-quality images to reduce the PDF file size. On the contrary, vector graphics look shape and clean.
2. Vector graphics are resolution independent. As a result, you don’t need to worry about the resolution requirements from journals. You can concentrate more on the content of your figures.
Note: If your figures have multiple panels and include both bitmap images and vector graphics, you and check out the post below to see how to preserve the vector graphics.