News extended module template overriding

Hi, I need to extend tl_news extension. I added some fields (e.g.: fileTree, select with related news options etc.). The entries successfully saved in database. And got the templatevars in the news list template. The image stored in the DB with blob format and related news is serialized array. How can I manipulate this data before displaying in the template file? I am also using news_categories module. If I extend the news module, is this affecting the news category filtering?

I guess you're talking about the core newsletter - this is not an extension.

Image:
If you've done all right, then your image field contains a UUID representing a file in tl_files. You can get its values like this

PHP Code:

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dump(\FilesModel::findByUuid($myFileUuid));
dump(\FilesModel::findByUuid($myFileUuid)->path);
dump(\FilesModel::findByUuid($myFileUuid)->meta); 


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Serialized array:

PHP Code:

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dump(deserialize($mySerializedArray)); 


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News category:
No, I don't think so.