Document sizes and jpeg compression / quality

In relation to Photoshop, in the status bar at the bottom it displays what it calls “document sizes”. Would someone be able to clarify can this be used to determin the quality of a jpeg file ?
For example if I open up a jpeg with no compression (file size on disk is 4.57mb) it displays Doc:34.5M/34.5M however if I open the same file with compression set at 5 (file size on disk is 748kb) and ‘document size’ doesn’t change. How does the document size relate to jpeg compression etc...?
Thank you

Open a file, say a tiff or psd, zoom in close to the image, about 400% on a recognizable detail. Use the Save As... command, select JPEG, and click Save.
When you get to the dialog box, run the Quality slider to 0 and observe what happens to the pixels. It's like they are clumped together in large blocks.
That's how it saves on disk space when it is written back to the file.
477k/477k is the uncompressed size/size in ram and 31.5k is the saved to file compressed size caused by clumping all those pixels together. Of course you trash the file that way,but that's where compression saves space. Not by reducing the pixel count,but by consolidating them.
My point is is that you adjust that slider by eye and from there decide what optimal quality number is worth the space saved.
With broadband connections and terabyte drives, I would not see any point to less than 12 quality compression these days.

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Hello ! how to change document sizes and use our own size (not A3, A2 ...) thank you !

hello ! how to change document sizes and use our own size (not A3, A2 ...) thank you !

Experiment. No harm in trying.
If you are just starting to use Pages you need to make your own assessment given current events whether committing your work to a format and software given this support is a wise move.
You also need to look at what will produce workable results. Particularly if your large posters are to be commercially printed and contain large bitmap (photographic) images.
Always work backwards from your output. Ask your printer what they require to do their job.
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When dragging an image onto a fresh canvas, the resizing feature presnaps the image into the canvas size. I can confirm that this has not happened to me in previous projects. I've also tested this problem by making a new larger document size and dragging

Contexts: I am very competent with GFX and have worked on many projects.
When dragging an image onto a fresh canvas, the resizing feature presnaps the image into the canvas size. I can confirm that this has not happened to me in previous projects. I've also tested this problem by making a new larger document size and dragging in the same render. It snaps again. I don't want to re-size from the canvas dimensions, I want to resize from the render's original dimensions.

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function(){return A.apply(null,[this].concat($A(arguments)))}
without losing print quality?
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#target photoshop
activeDocument.suspendHistory('Logo Resize', 'main()');
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Document sizes and jpeg compression / quality

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