Right now I'm uploading JPGs images into a blob column using webutil which is implemented in the app. But something weird happen. It seems the file is using more space that it would. For example: I just upload an 800Kb image, and when I try to download it the size is like 1.12Mb (I'm using Reports10g to accomplish this, converting the image to a PDF file) and even the size in the DB is bigger too.
If you upload a file using webutil_filetransfer, the blob in the database should have the same size as the file on the client. If you generate a pdf including the image, the pdf-filesize will likely be different as pdf stores images in a different way.