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Understanding Default File Naming and File Extensions for Images
ePublisher does not assign file names to images that are imported by reference. For these images, ePublisher preserves the original file names. For images directly included in a source document, ePublisher assigns a default file name for each generated image by applying the following default naming rule:
source-name.file-number.topic-number.image-number
The parts of the default naming rule are defined as follows:
source-name
Identifies the name of the source document without the file extension.
file-number
Identifies the number of the source document in the order it is included in its containing group in the project, such as 1 for the first source document in a group and 2 for the second source document in a group. This value starts at 1 for the first source document in each group in your project.
topic-number
Identifies the number of the topic (output page) generated from the source document, such as 1 for the first topic generated from a source document and 2 for the second topic generated from a source document. This value starts at 1 for the first topic in each source document.
image-number
Identifies the number of the image in the topic generated from the source document, such as 1 for the first image generated in a topic and 2 for the second image generated in a topic. This value starts at 1 for the first image in each topic.
For example, if you have a source document named MyFile.doc that contains two images in the first topic that generates an output file, and three images in the second topic that generates an output file, and all the images are directly included in the source document, ePublisher generates the following default output image file names: MyFile.1.1.1.jpg, MyFile.1.1.2.jpg, MyFile.1.2.1.jpg, MyFile.1.2.2.jpg, and MyFile.1.2.3.jpg. You can change the default format and file extension for each graphic style.