You do not seem to understand the Jpeg file formats uses data compression and that the compressed data size depends on the compression method user and the actual data. Data requires to record a field grass in much more complex and larger the the data requires to record the details in a blank white wall or a blue sky. A 20 Mega Pixel image saved as jpeg file may be smaller then 100KB or larger then 7MB. Jpeg file can record Pixel data and also Vector Path, have metadata and Profile data. Does not support Layers and layer transparency. What is recorded in Jpeg file vary.
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