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User currently offlineGerardo From Spain, joined May 2000, 3481 posts, RR: 31
Posted (13 years 8 months 1 week 1 day 4 hours ago) and read 1890 times:

Dear all

I know, there have been many questions like this. I have also browsed thru many topics, but somehow nothing I saw there seems to work for my problem.

What can I do to resolve that pixelation problem - above all on the background - on the next picture:


(Picture copyright by http://fly.to/zrh

If the picture doesn't show up, click on the next URL:
http://www.dplanet.ch/users/dominguez/Pics-old/photos/BC/B763_DL_A.jpg

The photo (print) looks pretty good to me. I use a Umax 1220S on a Mac with Photoshop. I scanned it with 400dpi, used the unsharp mask feature, adjusted a little bit the colours and changed the resolution to 800X600 at 96dpi.

Any help appreciated

Regards
Gerardo


dominguez(dash)online(dot)ch ... Pushing the limits of my equipment
5 replies: All unread, jump to last
 
User currently offlineDavus From Australia, joined Oct 2000, 174 posts, RR: 5
Reply 1, posted (13 years 8 months 5 days ago) and read 1804 times:

Hi,

The shot looks very nice to me. If anything you can see pixellation round the word 'delta'. Try to keep the image at the original DPI and just resample the size. Might not work but then again it might.

A very good shot in my opinion.

Regards

Dave
MEL, Australia


User currently offlineCkw From UK - England, joined Aug 2010, 730 posts, RR: 16
Reply 2, posted (13 years 8 months 4 days 15 hours ago) and read 1787 times:

In my opinion it looks oversharpened - note jaggy cheatline and, I think, unnatural levels of contrast in bare metal areas. Also I think large copyright notices may work against you getting accepted - the system adds one on the bottom of each pic anyway.

Cheers,

Colin



Colin K. Work, Pixstel
User currently offlineUSAir_757 From United States of America, joined Jun 2000, 996 posts, RR: 8
Reply 3, posted (13 years 8 months 4 days 11 hours ago) and read 1785 times:

To solve your pixellation problem - ease off bigtime on the sharpen.

Before resampling from 400DPI, run the unsharp mask at radius 1, amount 100, threshhold 10(NOT 0). Then resample, and sharpen once or twice(depending on your software, as different software has different sharpen intensities). That should prove for the best results. Also MAKE SURE that the scanner does NO sharpening during the scan. As for the contrast - I think that looks more like when you're actually standing there viewing the aircraft, and looks good the way it is.

Cheers,
C. Wassell



-Cullen Wassell @ MLI | Pentax K5 + DA18-55WR + Sigma 70-300 DL Macro Super
User currently offlineTomH From United States of America, joined May 1999, 960 posts, RR: 2
Reply 4, posted (13 years 8 months 2 days 5 hours ago) and read 1764 times:

Gerardo,
I also think you sharpened the image too much. Aside from the jaggies on the red cheatline, another clue is the lightened area in the sky just aft of the rudder on the vertical stabilizer. The blue sky looks a bit grainy also, which can happen if you sharpen excessively. Perform your image editing and as the last step after cropping, resizing and all other activities, sharpen the image just a little.
You may have a similar problem when working on images of executive aircraft. Many of these have several horizontal lines running back down the fuselage from the nose of the aircraft. When they are near horizontal in the monitor, they develop real bad jaggies. This particular problem is troubling me greatly, and unfortunately the advice I get from other photographers is that there is little I can do about it.


User currently offlineGerardo From Spain, joined May 2000, 3481 posts, RR: 31
Reply 5, posted (13 years 8 months 2 days 3 hours ago) and read 1757 times:

Thanks a lot. I did some homeworks, also with your input, and the result can be seen at the following URL:
http://g_dominguez.tripod.com/Pics/photos/BC/B763_DL_A.jpg

Mainly I didn't sharpen as much as I did earlier. What was most disturbing for me, was the grainy background, which I described as "pixelation" (sorry, but English isn't my first language ).

As for the large copyright banner: Thanks for this input. Should I decide to upload some pictures, I will remove this part. The picture is directly from my own homepage.

Once again, thank you very much

Regards
Gerardo



dominguez(dash)online(dot)ch ... Pushing the limits of my equipment
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