ASCII filters

When compressing images, you can select an ASCII filter to encode the image data in your PDF document as plain (ASCII) text. You may wish to use ASCII encoding if you need to transmit your PDF documents through channels where only ASCII characters are allowed. This may be required, for example, in some e-mail systems although most e-mail software in use today can properly handle non-ASCII documents. If ASCII encoding of the images in your PDF documents is necessary, you can select either one of the following ASCII filters: