I am trying to work out why there is such a large file increase when I
edit a file and save it. The background info:
Original file (from digital camera) - format, size, depth, geom:
JPEG 680590 8 2048x1536
After opening and saving original file with defaults (85% quality):
JPEG 646554 8 2048x1536
After opening and saving original file with defaults but with 100% quality:
JPEG 1618121 8 2048x1536
After opening, cropping and saving original file as a PNG file with
defaults (compression 9):
PNG 4722953 8 2048x1536
After opening, cropping and saving original file with defaults but with
JPEG 1631911 8 1590x1332
- When saving as JPG with 85% quality am I losing information?
- How can saving as JPG with 100% quality increase information (file size)?
- Why is PNG so inefficient?
- imageinfo doesn't seem to be able to indicate information structure
/compression information differences between the files - is there some
way of doing this?
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Sydney NSW 2001
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