Free Trial

Safari Books Online is a digital library providing on-demand subscription access to thousands of learning resources.

  • Create BookmarkCreate Bookmark
  • Create Note or TagCreate Note or Tag
  • PrintPrint

Choosing file format

In the brief history of digital imaging, many image file formats have been developed. Ultimately the photographic industry has tailored its use to just a few different types. Because of the properties of each, they have distinct functions within the imaging chain.

image

Figure 8.17 File formats for an example workflow from digital capture to web and printed output. The properties of each format (in blue) are optimal for the particular imaging task and stage in the imaging chain.

image

Figure 8.18 Summary of properties of some typical image file formats.

For example, as we have already seen, the choice at image capture between capturing RAW and (most commonly) JPEG files is one about workflow and file size. Further down the imaging chain, an image may be changed to a format more suitable for image editing. Here, the priorities are usually that they are a lossless format and that layers are supported. Some formats also support alpha channels and allow paths to be saved. The selection of a format for output depends on the type of output and the method by which the image is being transmitted, and is a trade-off between file size and quality, but also requires standard formats to ensure that all information (which may include colour profiles and EXIF data) is correctly transmitted with the image. Figure 8.17 illustrates possible workflow in terms of file formats. At the end of this section, Figure 8.18 summarizes some of the important properties of these formats.


  

You are currently reading a PREVIEW of this book.

                                                                                                                    

Get instant access to over $1 million worth of books and videos.

  

Start a Free Trial


  
  • Safari Books Online
  • Create BookmarkCreate Bookmark
  • Create Note or TagCreate Note or Tag
  • PrintPrint