Actual size of jpg (right click, properties) of the windows Viewer is correct?

When I open a jpg file in properties it tells me it's 6.42 M (for example 4413 x 3317 pixel at 180dpi). When I opened that same jpg in photoshop (pixels and dpi are the same), it is approx. 40 M
Who is right? You can get the actual size of the jpg in the windows Viewer easily? I catalog images and I want to record the correct data. Thank you

Each time a .jpg file is edited and re-registered it loses
a resolution. This can be very noticeable to a
low resolution photo... 640x480ppi for example.
In very high resolution photos that we have today
12-8-15 cameras digital megapixels... the
the loss is negligible and is not noticeable to
the naked eye.

If you had some very important pictures and wanted to
make sure that no loss is produced that you could save their
in a lossless PNG or TIFF format, but the file
sizes would be equal to that of your .jpg uncompressed.

This could be very important in a situation where
the photos were printed in very large sizes.
High resolution images can be a real asset when
a small part of the image must be cropped
as a separate photo.

An important factor for commercial printing of photos...
books, magazines, publishers usually ask for pictures
which are at least 300 dpi.

Tags: Windows

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