JPG File Size

[Paul]

Hello..

Could someone explain to me how to accomplish getting a file with such a large viewing area to have such a small file size and keep the quality?

If you go here:
www.mistervintage.com/cgi-bin/rob/auction.cgi?si&bcat&924299273&e1sub (http://www.mistervintage.com/cgi-bin/rob/auction.cgi?si&bcat&924299273&e1sub) and look at the image posted.. that is what I would like to be able to do.

Take it easy on me though.. I don't usually work with .jpg files. http://www.aota.net/ubb/smile.gif

Any help or good "link" would be appreciated.

Thanks
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Paul

[Justin]

Although a jpg file will always be 24 bit color, if you reduce the color depth of the file before converting it to jpg, it will come out smaller. It's less to have to deal with in the compression of the file.

You are not going to get it a whole lot smaller though, without losing quality - that's just not feasible http://www.aota.net/ubb/smile.gif Remember, the file still must contain all of the necessary data to reproduce the image, and compression can only do so much.

Personally I'd reduce the size - or if it's important that the photo be detailed, then leave it http://www.aota.net/ubb/smile.gif If people want to see it in high quality, they will wait.

You might want to make a GIF thumbnail, and link it to the full size pic, giving a user a choice. Just a suggestion http://www.aota.net/ubb/biggrin.gif


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Justin Nelson
FutureQuest Support

[Charles Capps]

Also note that there are TWO types of JPEG - standard and Progressive. Progressive JPEG stores the image data like an interlaced GIF, so when viewing the image through a browser, it slowly gains in quality.
The interlacing also allows the compression to be higher while retaining better quality, meaning smaller sizes. I reccomend Adobe ImageReady for making Progressive JPEGs. :-)

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"Okay, so I'm not "SANE" so to speak, but uh... I'm the lovable kind of psycho"
http://solareclipse.net/

[This message has been edited by Charles Capps (edited 04-11-99).]

[ChrisG]

Chirps in....

There is a filter for Photo Shop 4&5 and Paint Shop 4&5 which will take an image and minimise background noise hence you get a much faster loading image.

While trying to minimise bandwidth on the STZ I went through an image archive with this filter and managed to reduce a 17.6 megabyte JPG image archive down to 11.6 megabytes.

It does depend what type of image you are playing with though - if the background is a dullish colour the filter works great and knocks loads off the image size, however if the image is vivid with no defined areas of background then it will not work as well.

Do a search on Alta Vista for "JPEG Compression Filters" and something should come up - if not e-mail me and I will see if I can dig the CD it was on up ;)
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AAAAARRRRRRRRRRRHHHHHHHH!!!

I feel better now......

[Charles Capps]

About time you said something, Chris![nbsp][nbsp]I still think ImageReady is better than that method, but...

(Chris and I worked together...)
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"Okay, so I'm not "SANE" so to speak, but uh... I'm the lovable kind of psycho"
http://solareclipse.net/