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Downsizing for web content...
Old 10-09-2003, 02:59 AM   #1 (permalink)
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I've read numerous threads in varying places about upsizing images. My question deals with the opposite problem...downsizing.

Currently I'm scanning 4x6 prints on my flatbed at 600ppi then when I go to 300dpi for my printer I get 8x12 capabilities without any loss of pixel information. Which is fine for the printer.

But when I go to make web content I change the resolution to 100ppi and the pixel size as 400x600 or 600x400 (depending upon the image as vertical or horizontal). This means that from starting out with a 30meg file I end up with about 730Kb.

Next, I'll save for web as .jpg with a quality of about 60% which further reduces the file to about 1/10 of the size (around 70Kb). So I've gone from honking huge to very manageable file size...but at the expense of picture quality.

Does this seem to be a viable procedure or is there a better way to maintain a high quality image when downsizing?

Thanks, Richard
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Re: Downsizing for web content...
Old 10-09-2003, 08:29 AM   #2 (permalink)
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There seems to be a point on compression where things really go away fast. 60 seems a bit on the low side. It really depends on the image.

Try sizing it down, running unsharp mask on it and saving it at around 80 and see if you are happy with those results.

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Re: Downsizing for web content...
Old 10-09-2003, 08:35 AM   #3 (permalink)
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Hi Richard!

72 dpi is much enough for web. I always use 72 dpi in the web. And you need to choose 100% quality, when you saving the jpgs. I havent counted, but I think with 72 dpi 100% quality, you get similar size as 100 dpi 60%.
Hope I could help.
Daniel
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Re: Downsizing for web content...
Old 10-09-2003, 08:50 AM   #4 (permalink)
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Richard,

I will try to give you a a description of how I do my pics.

I shoot an S2, I shoot at the 4XXX size JPG, gives me a start image of 6mb

Once I find images I want to use, I use the crop tool and crop it to 8x12 @ 300 DPI - Yeah technically I loose a few pixels, but you NEVER see it !!!!!!

(That being said, I even crop 12x18 @ 300 dpi and you dont see any loss of quality on the printed image)

Then I take my 8x12 image at 300 dpi and run it thru a conversion action I spent a day writing.

The action takes the original image and turn it thru about 14 steps (4 in downsizing, 4 in unsharp masking and 2 in mode changes a couple in selecting layers etc) turns it into my finished web image. My finished web images are either 600 px tall for portraits or 700 wide for landscapes.

My borders and branding are a seperate action.

Here are a couple of pictures, I dont really think they loose that much quality in the downsizing.

Just out of interest, my final action saves for web at a 65%setting.

hope this helps,

DP






 
 
Re: Downsizing for web content...
Old 10-09-2003, 05:46 PM   #5 (permalink)
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I downsized this one from 8x12 at 360dpi.
Did a bit of sharpening before saving for WEB in PS at 130KB.
My standard procedure.
It works for me.

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Re: Downsizing for web content...
Old 10-10-2003, 12:19 PM   #6 (permalink)
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Just a couple of thoughts. Computer screens display at 72 pixels. If you have a 300 pixel image, it still displays at 72. JPG is a loss process by nature even at 100% it tosses a few. So, don't convert jpg to jpg. Scan printss once to final size and dpi in a lossless format then do your work then convert to jpg. The fewer the number of format conversions and dpi/size changes usually the better since the algorythms involved may decide to toss some pixels in the process.

One of the top graphics people in the country who teaches for Adobe and Sytex (or whatever the name is for the big layout program used by magazines and newspapers)as well at a university told me she always does a final jpg save at 75%-80%. Less she said is usally decernable and more was a waste of bandwidth.

Best
RW
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