Photoshop: Are images compressed once when saving and a second time when saving it to a JPEG file?

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I am a painter working with PS to save my imgs as jpgs in order to enter competitions. I can get the jpg to the correct size -- according to the requirements set by the online submissions services -- but when I save the image to a file it is radically reduced! The result is that my images are being submitted much smaller -- less than half size allowance. One of my paintings in a show catalog was tiny and this is what made me start looking at the file sizes -- I thought I was submitting the size the img was in the PS page. The random "second" reduction (the first is the compression when saved as a jpg) seems to happen in the navigation to the folder, while remaining the correct size in PS. Does anyone know what is happening here and how to correct it?
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Ellen Strier-Petrey

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Posted 4 years ago

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Chris Cox

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This sounds like you are misunderstanding image size and file size a bit.

The size for competitions usually refers to both separately (ie: 800x600 pixels, file under 600 KB). The size in memory (ie: 1.4 Meg) for the uncompressed image is not really related to the file size, because the file will be compressed and possibly have additional metadata.

Yes, saving to a compressed file format does compress the image data - as it has to.