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ZEISS DTI thermal imaging cameras. For more discoveries at night, and during the day.

zip question (1 Viewer)

Strandman

Strandman

Well-known member
Hello all. What's the usual amount of compression when images go into a a zip file? Reason for asking is that someone has gone to a lot of trouble to send me as a zip package about 20 reference photos but the file size is only about 1.5MB and seems to be corrupted. I think the problem is at sender's end, but before I go back and pester him further, just roughly (ballpark) what sort of size would you expect a package of this sort to be?

As ever, thanks in advance for any responses.

Update: Issue resolved (full package now received)
 
Last edited:
ed keeble said:
Hello all. What's the usual amount of compression when images go into a a zip file? Reason for asking is that someone has gone to a lot of trouble to send me as a zip package about 20 reference photos but the file size is only about 1.5MB and seems to be corrupted. I think the problem is at sender's end, but before I go back and pester him further, just roughly (ballpark) what sort of size would you expect a package of this sort to be?

As ever, thanks in advance for any responses.

Update: Issue resolved (full package now received)
Click to expand...

Image files don't compress by very much, if at all. I have seen ZIP files containing images larger than the image file.
As to the size of the ZIP file. It depends on the sizes of the image files.

Its one of those questions like " How long is a piece of string" ?.

Sorry!.
 
alan_rymer said:
Image files don't compress by very much, if at all. I have seen ZIP files containing images larger than the image file.
As to the size of the ZIP file. It depends on the sizes of the image files.

Its one of those questions like " How long is a piece of string" ?.

Sorry!.
Click to expand...

Thanks Alan- that was more helpful than you thought as I was checking my instinct that the amount of compression should not be all that much.
 
The amount of compression depends on the type of image file you're dealing with. JPEG images (name.jpg) are already a compressed image format, whereas TIFF (name.tif) and BitMap (name.bmp) don't use as much and you'll see your compression stats be a bit higher.
 
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