[SNIP]
As for PNG: As far as I know, the only issue with any realistic browser
(other than very old ones like IE2 or something) is that the alpha
channel is not supported. As there is no alpha channel in JPEG, so
there is no difference. Though I do not profess to be absolutely sure
[SNIP]
Considering in this thread where I left the quality at 100% and
reduced the image to less 40 percent of the original, and the end
result was that I actually made a larger file. So, I belive that at
least this example shows that 100% is not a good quality value
setting for reducing
As I promised, here is the writeup with examples:
http://nerds-central.blogspot.com/2006/08/choosing-file-format-for-small-web.html
Cheers
AJ
tedd wrote:
Alex:
Excuse for top posting:
You said: Clear as mud?
Well actually, it's simperer than I thought. After your reply, I did
some
To: Alex Turner; php-general@lists.php.net
Subject: TPN POSSIBLE SPAM:[PHP] Re: Why small big?
Alex:
Excuse for top posting:
You said: Clear as mud?
Well actually, it's simperer than I thought. After your reply, I did
some reading on jpeg and found it's simply a transform, not unlike
FFT where
I'm not quite sure, but consider the following:
Considering the fact that most JPEG images are stored with some form of
compression usually ~75% that would mean the original image, in actual
size, is about 1.33x bigger than it appears in filesize. When you make a
thumbnail, you limit the
M Sokolewice got it nearly correct. However, the situation is a little
more complex than he has discussed.
The % compression figure for jpeg is translated into the amount of
information stored in the reverse cosine matrix. The size of the
compressed file is not proportional to the % you set
Alex:
Excuse for top posting:
You said: Clear as mud?
Well actually, it's simperer than I thought. After your reply, I did
some reading on jpeg and found it's simply a transform, not unlike
FFT where two-dimensional temporal data is transformed from the time
domain to the frequency domain
Tedd,
Sorry for the floppy language. You are quite correct, the name is
discrete cosine. I get too relaxed sometimes!
As to the visual impact of a degree of compression, I don't think that
you can automate this. The issue surrounds the way the brain processes
information. When you see
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