When I open a Tiff in PS7, the file size at the bottom gives the file size, as say, 30mb. If I then change it to a slightly compressed JPEG at a smaller image size, the figures at the bottom change to maybe 10mb.
When you make the image size smaller, it goes down to 10MB. That is the uncompressed size of the layered image.
This is obviously wrong, and when I then send the jpeg by email, the attachment is listed as , say 800kb.
800KB=compressed, flattened size. 10MB=uncompressed, layered size.
It also lists the image as
filename.tif.jpg. How do I find the true file size, and what is a tif.jpg?
The "true" file size is the size on disk--800K. The "true" image size is the size when the image is uncompressed--10MB
A .tif.jpg is a JPEG. You did not set the name of the file correctly when you saved it.
Virus writers use this kind of convention to trick people, but the rule is very simple--you ONLY look at the LAST three letters. The file
myfile.tif.doc.eps.art.dxf.xls.jpg
is a JPEG. It's not a TIFF, it's not a Word file, it's not an EPS, it's not an AOL ART file, it's not an Autocad file, it's not an Excel spreadsheet, it's a JPEG, plain and simple.
Virus writers will sometimes send out viruses that are named something like
britneynude.jpg.exe
It is not a JPEG. It's an exe file, plain and simple. You look at the last three letters, nothing else.
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