Recover | DropDMG | What do I NOT understand here?

DropDMG

Create disk images & archives by drag & drop.

Version: 2.8.6

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What do I NOT understand here?

Feedback Type: Commentary

Contributed by: molex1000 Sunday, July 29 2007 @ 10:13 PM PDT

Product Platform: MacOSX

Used Product For: Less than a month

Recommend Product: NO

OK, the file full of pics I want to compress is 73.5 megs. I drop it, a DMG is created and the DMG file is... 73.3 megs. Wow. I saved virtually NO space, there was virtually ZERO compression... why not just email the folder with the pics in it? How is the DMG file any better if it's virtually the SAME SIZE? Why is this called "compression" when no compression is happening? WTF?

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Picture files are already internally compressed - michaeltsai

Graphics formats such as JPEG and PNG have built-in compression. A typical JPEG file is already shrunk to between 1/10 or 1/100 of its original size (in an uncompressed format such as TIFF). So additional compression via DropDMG or similar utilities will not be able to squeeze it down much more. However, if you ask DropDMG to compress files that are not already compressed, for example text, RTF, HTML, Word, and Excel documents, DropDMG will make them much smaller.

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Monday, July 30 2007 @ 10:14 AM PDT