Am 2006-05-31 20:17:34, schrieb H.S.:
That was really great help. Thank a ton. The problem of identifying an
image as progressive or not is solved.
I use the netpbm package and its tools.
The problem left is to convert all my current jpegs into progressive
ones. jpegtran did the job (the
Wayne Topa wrote:
All of the inages on our web site are converted with the 'quality 25'
option. I find a lot of sites with images that are 100K or more just
take too long to load. There are still a lot of us that live in the
sticks and don't have access to anything but slow POT lines.
H.S.([EMAIL PROTECTED]) is reported to have said:
Hi Wayne,
I tried your way and converted all the image with quality 25. You are
right, I couldn't notice any perceptual difference at normal size. The
different is noticable only if you magnify the image.
I had a total of 14 images of size
H.S.([EMAIL PROTECTED]) is reported to have said:
Olafur Jens Sigurdsson wrote:
Imagemagick does the trick for you.
To see if your files are interlaced or not you can use identify
-verbose filename.jpg and search for the Interlace line and if it says
None then it isnt a progressive
Wayne Topa wrote:
Having never heard of a progressive jpeg I was interested in your
query, and the answer you received.
I tried out the conversion to progressive on some of my large jpegs
to see if it would help (as I have the same problem you have, dialup).
I used the suggested
H.S.([EMAIL PROTECTED]) is reported to have said:
Wayne Topa wrote:
But converting a jpeg to progressive somehow has the effect that the
progressive jpeg file is slightly smaller than the non-progressive one,
but the client then uses up more RAM to reconstruct the image -- not
that
Wayne Topa wrote:
This is a case of compression with a loss in quality. Note that you can
still have the new smaller image either as progressive or non-progressive.
I don't see that loss in quality tho. At 1280x1024 they look the
same, to these old eyes anyway, and the savings in size
Hello,
I have searched google but haven't found an answer I was looking for. I
want to upload some family pics to share among relatives. Some have
dialup connections. To facilitate image downloads in their browsers, I
want to upload progressive jpegs. How do I find out if the jpegs I
already
Þann 2006-05-31, 17:12:36 (-0400) skrifaði H.S.:
Hello,
I have searched google but haven't found an answer I was looking for. I
want to upload some family pics to share among relatives. Some have
dialup connections. To facilitate image downloads in their browsers, I
want to upload
Olafur Jens Sigurdsson wrote:
Imagemagick does the trick for you.
To see if your files are interlaced or not you can use identify
-verbose filename.jpg and search for the Interlace line and if it says
None then it isnt a progressive jpeg and if it says Plane it is.
That was really great
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