The preferable image format is SVG, since it is a scalable vector format, specifically designed for the internet. It is particularly useful for cellular processes since these tend to be diagramatic in nature. It also lends to easier editing, if we decide to change aspects of the scheme. Raster image formats are also acceptable, however one must remember that image quality tends to diminish with scaling. When using a raster format, PNG is preferable to JPEG. See Wikipedia:Preparing images for upload
In general, protein structures should be coloured using the 'chainbow' effect which creates an N-C terminal blue-to-red color gradient which can help to show how protein sequence relates to tertiary structure.
In order to maintain a standard for Cell and molecular biology articles a standard color scheme should be used. The accepted colors for cellular locations are described in the table. Colors for other components, such as molecules, can be chosen at the discretion of the designer, however, the following should be considered:
Colors should be chosen so that they contrast with existing colors in the image
Colors should be chosen such that text can be easily read on it.
Text should be black
Arrows should be black, however, different colors may be used to describe a set of processes or to contrast colors.