Google's John Mueller clarified in yesterday's webmaster hangout video that while Google does look and read the alternative image attribute (alt tag) for use on web search, it plays a small role there ...

Google's John Mueller said on Twitter that text within an image's alt attribute is generally seen as text "as a part of the page where the image is embedded." If that text is within an H1 tag, then ...

Writer Attributes for Supported File Types describes the attributes that you can specify for the image writers. When you are writing images, you must specify the FORMAT= attribute. You can specify ...