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01-21-2009, 10:42 PM   #1
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Jagged edges?

What causes jagged edges on a pic?

01-21-2009, 10:49 PM   #2
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a knife....

wait... what do you mean? there could be bad anti-aliasing (or none at all)... or bad compression (lossy)... or upscaling an image.....

unless you mean something else?
01-21-2009, 10:57 PM   #3
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QuoteOriginally posted by Vylen Quote
a knife....

wait... what do you mean? there could be bad anti-aliasing (or none at all)... or bad compression (lossy)... or upscaling an image.....

unless you mean something else?
I think it might be bad compression. I just got my K20D yesterday and a Sigma 18-50mm f2.8 macro lens. I took a few pictures with it right out of the box. I later went in and changed the jpeg to 4* quality instead of 3* quality. I didn't upload them until today and noticed one pic with a jagged edge on it.
01-21-2009, 11:05 PM   #4
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Can you post an example?

Jason

01-22-2009, 12:03 AM   #5
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QuoteOriginally posted by Jasvox Quote
Can you post an example?

Jason
I'll try to post one later. I don't have a good connection where I'm at right now.
01-22-2009, 05:49 AM   #6
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Make sure you resize at bicubic
01-22-2009, 01:56 PM   #7
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QuoteOriginally posted by JCSullivan Quote
Make sure you resize at bicubic
How do I do that? I uploaded the pics but they don't look the same and the crop is tiny.
01-23-2009, 01:50 PM   #8
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QuoteOriginally posted by FunkyMonk Quote
How do I do that? I tuploaded the pics but they don't look the same and the crop is tiny.
Totally depends on the software you are using to do the cropping, resizing, and uploading, and the site you are uploading to.

And actually, the whole issue of jagged edges depends on those same factors. Basically, you get jagged edges when you either have too much compression on your JPEG (low quality setting) or when you resize using software/options that doesn't work hard enough to eliminate the jagged edges that might result from a "dumb" resizing.

The edges shouldn't be particularly jagged when viewed straight from the camera, assuming you are using a reaosnably high quality JPEG setting in camera and are viewing at 100% in your viewing softeafre. When viewing bigger than 100%, of course you'll get jagged edges. When viewing smaller than 100%, you might look to see if your viewing software has options to control how resampling is performed.

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