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Please help me, if you can!
How does Image Data in GIF file forms?

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<GIF Data Stream> ::= Header <Logical Screen> <Data>* Trailer

<Logical Screen> ::= Logical Screen Descriptor [Global Color Table]

<Data> ::= <Graphic Block> |
<Special-Purpose Block>

<Graphic Block> ::= [Graphic Control Extension] <Graphic-Rendering Block>

<Graphic-Rendering Block> ::= <Table-Based Image> |
Plain Text Extension

<Table-Based Image> ::= Image Descriptor [Local Color Table] Image Data

<Special-Purpose Block> ::= Application Extension |
Comment Extension

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Legend: <> grammar word
::= defines symbol
* zero or more occurrences
+ one or more occurrences
| alternate element
[] optional element