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Old 24th October 2003, 11:26 AM   #1
chris ma is offline chris ma  Canada
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Default How do you do it?


I am wondering what kind of cameras people used to take such good picture and yet the picture is big but the size of the file is small enough for posting here?


If I scan my postcard size pictures the file size is like average of 23M, and if I use photoshop to reduce the size the quality of the final version is very poor with the change from 23M to 83k.

How and what is the norm to play with jpg files?

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Old 25th October 2003, 12:13 PM   #2
Netlist is offline Netlist  Belgium
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Found something for you at Jason's site:
Didn't take the time to read, but maybe this can help you.

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Old 25th October 2003, 01:36 PM   #3
AudioFreak is offline AudioFreak  Australia
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How do you do it?
My advice would be to read that article, choose a graphics editor and then practice, practice, practice. After a little while, you'll start to get a feel for what works best with what kinds of images.
- Dan
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Old 26th October 2003, 05:06 AM   #4
wintermute is online now wintermute  Australia
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Hi Chris,

It depends a lot on the initial image. Images with lots of fine detail don't compress as well with jpg. I just did an experiment. I got a photo I had previously scanned (It is a test photo, I shot while evaluating a new 20mm lens). It is scanned at 4000dpi off the negative. original scan is around 125MB in size 5600X3868 pixels.

I resised in photoshop to 800 X 533 using bicubic resampling, the saved as a jpeg with quality level 7. too big at 158kb.

So I resaved at quality level 5, now 95Kb which is within the limit (just). The quality on this looks ok to me. I also saved with quality level 0. This then got it down to 44Kb but artefacts are pretty apparent. The only other thing I did was manually adjust the levels a bit. Unsharp masking if done properly can also enhance the image

I'll attach the image which is nothing special (basically the view out the front of the camera shop). I did nothing more that what I have said here. No smoke and mirrors just a bit of trial and error.



edit: this was taken on a nikon F80 with nikon 20mm lens. using fuji presspro 400 film.
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File Type: jpg 20mmtest_3.jpg (94.2 KB, 91 views)
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Old 27th October 2003, 12:41 AM   #5
roddyama is offline roddyama  United States
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Hi Chris,

I took all my pics from last years CES with the bottom of the line Sony digital camera.
I set each file for 1024X768 at about .5Mb jpg. Than I used Adobe Photo Deluxe that came for free with my scanner to size it and save it as a smaller (<.1Mb) file. As AudioFreak says, "practice, practice, practice".
Rodd Yamashita
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