Beemer wrote in news:MPG.1a834c65d43d7bc9989721
@news-lhr.cableinet.net:
In article ,
says…
A JPEG is an image, not a document.
Resaving a JPEG image *by itself* to pdf cannot gain you anything and will almost certainly lose something.
I did say that I was going to save the jpg AND other items in a pdf fle which as you especially will know is one of the advantages of pdfs.
Your phrasing leaves the impression that you are saving the jpeg as a PDF, then adding other things to it. On review, I’m mistaken. Sorry.
<snip>
Lossless 90 degree rotation is a trick which shuffles the order of the bytes in a JPEG file; since the image doesn’t have to be re-
compressed,
the process is lossless.
Not an issue
Well, yes, it is. Unless you did something else to the file in question, it is directly an issue.
Had you used one of the lossless rotation features, the file size would not have changed, and one more layer of JPEG re-compression would not have been added.
It’s faster, too, especially when you’ve got a number of images to turn, as you can select a group and let it run, no opening and re-saving.
I have no idea why you would have that understanding. JPEG compression throws away information *every* time it’s re-saved.
I agree with the above answer but I feel it veers away from my understanding/resolution of my perceived problem.
The point I’m trying to make is that you have another problem as well.
If you are going to do edits to an image, best to save into a lossless format like Tiff while you are working, place the Tiff in your page layout package, and then make a pdf with the appropriate amount of compression for the target purpose, offset print, office, web, whatever.
Trying to optimize it beforehand means you add another layer of JPEG compression, sacrificing quality, often an extreme amount.
<snippage>
You are I assume THE Eric Gill?
Typographer, sculptor and religious nut?
No. He kicked off in 1940. No relation, other than an admirer of his work and fierce critic of his morals.