baldursveins
Posts: 124
Joined: Sun Jan 23, 2005 8:43 pm

A Little Help With The Jaggies

Fri Jul 29, 2005 6:01 am

I wonder if anyone out there is prepared to give me a bit of help with jaggies after downsizing. I am not sure if I am at all going to try to upload the result, but would be extremely grateful for pointers.
I took this photo of Lauda Air 737-8Z9, OE-LNP at Kef on 26.07.05. With 78 photos of it already in the database there is not a real need for an additional one. But I would like to learn something from trying to edit this one up to an acceptable level. I shot RAW on a Canon 20D with a 70-200 2.8 lens 1995 model, which makes it into appr. 100-320 on the 20D. The weather was great for photography, but when I got back I found for the first time in my experience at Kef that I had a real problem with heat haze up there. That might be part of the problem. I used the JPG file that the camera saves for these trials instead of extracting e.g. a TIF file for editing. That might also be part of the problem

Here are links to four versions of the photo. The original full size, but rotated and cropped file. I did not use USM for it, just the sharpening tool on lettering and some edges. I used levels and got rid of the flat areas to the ends and darkened it a bat with the middle slider. This is the result.

http://www.verslo.is/home/baldur/an/OE-LNP-05-07-26_5372_sh_3105.jpg

a 3105 pixel wide file 3.3 MB

I then downsized it to this

http://www.verslo.is/home/baldur/an/OE-LNP-05-07-26_5372_sh_1024.jpg

the usual 1024 pixel wide file, and the fuselage stripes show a lot of jagged edges.

I then tried a downsizing the original to 1500 pixels with this

http://www.verslo.is/home/baldur/an/OE-LNP-05-07-26_5372_sh_1500.jpg

and the edges are not as jagged.

At last I thought why not try half size, and this is the result.

http://www.verslo.is/home/baldur/an/OE-LNP-05-07-26_5372_sh_1552.jpg

Now any thoughts about the half size photo, and most importantly, any pointers as to how to avoid the jaggies when downsizing to 1024?

Hope some kind soul will see fit to point me in the right direction, even if the photo will never be uploaded.

Baldur
 
sulman
Posts: 1963
Joined: Wed Mar 03, 2004 5:09 am

RE: A Little Help With The Jaggies

Fri Jul 29, 2005 6:12 am

Baldur,

The only thing I can think of is haze. I've seen jaggies on resizing before (particularly in the gap between trailing edge and flaps when viewed from below).

On the original (which is actually a damn nice image) you can see the cheatline is distorted virtually it's entire length, and with shrinking I think this has 'stepped' a little.


Cheers

James
It takes a big man to admit they are wrong, and I am not a big man.
 
Psych
Posts: 2944
Joined: Tue Nov 16, 2004 1:17 am

RE: A Little Help With The Jaggies

Fri Jul 29, 2005 6:39 am

Baldur,

I have had a close look at your different versions and would agree that there may be a slight heat haze. But I certainly don't think that it is 'fatal' for the shot.

I took the liberty of having a play with the largest image, reducing it to 1024 myself, then applying USM as I would normally and then erasing the jaggies as best I could. The result is similar to the 1024 version you posted, maybe slightly less jagged.

My own feeling is that with such narrow lines, photographed at an angle as they are, it is almost impossible to reproduce the image with out any jaggies being apparent - heat haze or no heat haze. I have heard of people reducing the file size in stages in order to maximise quality, but I must say this is not something that I am used to doing. I would be very interested to know if others would expect to be able to capture such a livery at this angle without there being some jaggies, even with an 8 MP sensor.

All the best.

Paul
 
baldursveins
Posts: 124
Joined: Sun Jan 23, 2005 8:43 pm

RE: A Little Help With The Jaggies

Fri Jul 29, 2005 6:03 pm

James and Paul

Thank you very much for taking the time to reply and ponder the problem. I would be extremely interested in hearing from others, maybe someone like Paul mentioned that have overcome this problem. I am positive that the 1024 version of this would never make it on AN, then of course there is the question of if I should try the 1552 pixel version which is inside the maximum size limits, both as to filesize and width.

Any more views on this?

I have two others that I would not upload to ANet because of the same problem but I put them on my own page.

http://www.verslo.is/baldur/1024/TF-FIK_05-07-26_5487_1024.jpg

and

http://www.verslo.is/baldur/1024/TF-FIH_05-05-18_a_1024.jpg

Both suffer from the shallow angle in the narrow lines. Then another where the angle is not as shallow or acute and the lines are fine is in the database as


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Photo © Baldur Sveinsson



I have been looking at some ANet photos and it seems that at least some people have been able to overcome this problem.

Baldur

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