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if the blob data is in base64 encoding you could place it in an IMG tag with this syntax
See http://en.wikipedia.org/wiki/Data_URI_scheme for more info on this.
<img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAUA AAAFCAYAAACNbyblAAAAHElEQVQI12P4//8/w38GIAXDIBKE0DHxgljNBAAO 9TXL0Y4OHwAAAABJRU5ErkJggg==" alt="Red dot">
Thanks for your try:
We would identify the source type as a Media Resource, and use an SQL statement with the primary key and the BLOB column. When we use Media Resource, we are essentially telling APEX Service not to marshall the data
Re: RESTful Service: Expose BLOB file inside DB as RESTful service ??