You can include a picture or logo, e.g. your company logo, in your feed. This would allow rea­ders to vi­su­al­ly re­cog­nize the sour­ce of the feed.
This feature is very rarely used, though. You can skip these pa­ra­me­ters if you do not wish to add a pic­ture.

Field name Purpose Constraints Example(s)
Image title The title of the image, shown when the reader of the feed puts the mouse cursor over the image. Optional.

Max. length: 64 charac­ters*.

MyCompany News
Image URL URL where to find the picture file. The same as when you embed a picture into a web page. Optional

Max. length: 255 charac­ters*.
Must be a valid URL.

All other pa­ra­me­ters of this group are ir­re­le­vant when this one re­mains empty.

http://www.yourdomain.tld/images/logo.png
Link URL Link where to go when the user clicks the picture. Optional.

Max. length: 255 charac­ters*.

http://www.yourdomain.tld/index.html
Width Width of the picture in pixels. Optional.

Numeric.
Max. length: 6 digits.

72
Height Height of the picture in pixels. Optional.

Numeric.
Max. length: 6 digits.

36
  * field may contain variable references