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Old Apr 4, 2011, 10:50 AM   #1
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Default Jaggies

I have just noticed that one or two of my photo's have jaggies around them.
Was it over sharpening that has caused the effect?
I do have the in camera sharpness set above the default but it is just on the odd one?
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Old Apr 5, 2011, 12:26 PM   #2
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To answer my own question somewhat.
I have found that by using Guasian Blur and factoring in 1.00 it appears to get rid of the offending jaggies, so I think I will use less sharpening in camera. They only noticed in this fairly high contrast image.The one with the Dolphin pic behind is the original, the next is the P/P.shopped one with a bit of extra sharpening plus jaggies.
Since uploading the pics
I will carry on and post these two pics even though I cant see the jaggies in this post as it appears that resizing had got rid of them.They were very visible when I emailed the p/pd one to a friend.
I am sure that someone out there will tell me whats going on .
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Old Apr 7, 2011, 10:30 AM   #3
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But why did you use the camera built-in sharpening, in the first place?

I always set "neutral" for JPEG
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Old Apr 8, 2011, 7:51 AM   #4
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I'm new to the digi photographer bit, but not new to emailing photos, here's the clue....

They were very visible when I emailed the p/pd one to a friend.

Happens all the time due to the email service reducing image data size. Just a guess that this is what happened to the OP.
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Old Apr 8, 2011, 10:08 AM   #5
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big-potato,
it just saves me having to sharpen everything up in p/s.The only time I dont use it is when I take a portrait as they usually look better softer. It's something I haven't been doing all that long so the jury is still out.I do like photos to come out of the camera as I like them if possible.Ijust dont like spending forever post processing.
If you look at the monkey with the Dolphin behind it, that is straight out of the camera.
The other one had a tad more sharpening applied when I did away with the Dolphin as imho it was a distraction.
Just John
you are right I guess that it is down to resizing but it doesn't happen to all my photo's so maybe it's to do with how much post processing the photo has had first, as that enlarges the file. This is why I started the thread, to get a definitave answer but I should have posted the thread differently .i.e what causes jaggies.
I haven't been digital for that long either but this is a great site for getting good info.
As a matter of interest my name is John also so perhaps I should have Just another John as my signature.
Thanks all
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Old Apr 8, 2011, 10:20 AM   #6
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You might find that it's the resizing in the email package causing it. Lots of software uses bicubic resizing which gives much sharper results but can over-emphasize any sharpening you (or the camera) has already done.
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Old Apr 8, 2011, 6:52 PM   #7
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Jaggies are usually a result of oversharpenning and typically appear in slanted lines. They can be eliminated by applying sharpening in layers and then erasing them where visible on the top layer. BTW, I was unable to spot any jaggies in the posted images. The image on the right just looks softer than the one on the left.
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Old Apr 9, 2011, 2:26 AM   #8
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What everyone's said so far...

Keep in mind that unless you are looking at 100% full size as created by
the camera (one screen pixel for one camera image pixel) then everything
else is an interpolation... If you view an image at 50% then each pixel on
your screen is an "Interpolation" of two camera full size image pixels.. If
you view it at 33% than each screen pixel represents three camera full size
image pixels...

Right click on a full size image file and choose "Preview"... It will display
by default at best size to view on the screen... Put your pointer on the
image and turn your mouse wheel one click at a time and the image will
enlarge... Each time the image changes size will introduce different kinds
of anomalies... Jaggies, moire, banding, artifacts, all a result of the interpolation
needed to desplay the image at a given size...

If you want to somewhat counter the Jaggies effect do your sharpenning
on the image as a last step at the final size that you intend to have it
desplayed/viewed at... Understand also that when emailing or displaying
images they will be subject to the screen resolution being used by the
person who is viewing them, as well as any interpolation performed by the
email software or website, and this you will have no control over...
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Old Apr 10, 2011, 6:11 AM   #9
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Right click on a full size image file and choose "Preview"... It will display
by default at best size to view on the screen...
I dont seem to have this facility on my P/S version.
But thanks again for all the advice everyone.
I realised after I upoaded the pics that the jaggies werent visible but carried on with the post anyway just in case they showed up in the finished item.
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Holster + Shoulder Bag.
Beike carbon 4 section tripod/monopod
Gorillapod SLR Zoom + BH1 ball head
Panasonic FZ1000
Panasonic FZ200
Nissin D i40 Flash
+ SLR Gorillapod

Last edited by deadshot; Apr 10, 2011 at 6:16 AM.
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Old Apr 10, 2011, 11:12 AM   #10
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It's not part of P/S it's part of windows... If you right click on the "Image File" in windows
and choose "Preview" it will display the image in "Windows Photo Viewer"...

If you have a Mac I don't know what they do...
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