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FORUMS Cameras, Lenses & Accessories Small Compact Digitals by Canon 
Thread started 07 Apr 2009 (Tuesday) 15:57
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SX1IS And Purple Fringing (warning: a couple of big pictures)

 
alan_potter
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Apr 07, 2009 15:57 |  #1

This is a follow-on post to something I mentioned in the SX1 sticky.

A couple of notes first:

1) All of these pictures can be found in the flickr set at http://www.flickr.com …p/sets/72157616​386452189/ (external link)

2) The RAW file can be downloaded from http://www.stagepics.c​o.uk/temp/at_home_001.​cr2 (external link) A 16-bit TIFF made from the RAW (60MB) can be found at http://www.stagepics.c​o.uk/temp/at_home_001.​tif (external link)

Okay, with that out of the way, the reason I went for the SX1 was that I saw it as an ideal summer holiday camera. One box, with a huge zoom range and HD video, and dramatically lighter than the SLR. What could possibly be better for a fortnight in Disneyworld?

The camera did surprisingly well when I took it to the theatre and tried some low light shooting with it. However, I think that I have been too used to my Pro1 and, more recently, 350D with 24-100 L. I have just never been happy with bright-light pictures from it, and that's exactly what I bought it for.

Okay, on to examples. We had a rare bright day recently and so I stepped outside and took a photo of my car in the driveway. Dull as dishwater, I know, but it serves a purpose.

I shot in RAW+JPG, and the full size JPG is available at the flickr link quoted above.

#1 - the JPG

IMAGE: http://farm4.static.flickr.com/3654/3421480371_417a122ce2_b.jpg
Now I must admit that I had forgotten to switch on -1/3EV exposure correction, that I find essential to stop blown highlights. My bad. However, I did remember to force it to ISO 80.

#2 - the RAW converison. This was imported to DPP 3.6, then I made sure that all noise reduction and sharpening was switched off. I set the colour balance to sunny, exported it as 16-bit TIFF, and imported it into Photoshop Elements. This is the saved-as-JPG result - slightly more pleasing to the eye, I think:
IMAGE: http://farm4.static.flickr.com/3338/3421483739_e1530e269a_b.jpg

#3. Look at the corners - top-left first
IMAGE: http://farm4.static.flickr.com/3325/3422286172_36d58edcde_o.jpg

#4 top-right
IMAGE: http://farm4.static.flickr.com/3326/3422286272_4402be8d7a_o.jpg

#5 And it's not just the corners - look at the wheel rim
IMAGE: http://farm4.static.flickr.com/3316/3422286456_6e0d8bebf2_o.jpg

Okay, so I know that a lens like this has to have massive compromises. But I think for me the compromises might be too much. Or am I just being too picky?

On the other hand, if anyone can suggest how I can PP the purple fringing out, I'd be very interested. A software package would be a lot cheaper than trading the camera in and buying a Panny GH1!

regards,
/alan

Falkirk, Scotland.
Project 365 Blog (external link) | flickr (external link)

  
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skid00skid00
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Apr 07, 2009 20:39 |  #2

Adobe Camera RAW, -when- Adobe updates it to handle the SX1.
Adobe DNG, ditto as above (for those who don't have a current version of PS).
The lens correction filter in Adobe CS2 or above.
DXO software, which I tried and hated, but you can test it free for 2 x 2 weeks.




  
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alan_potter
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Apr 08, 2009 02:20 as a reply to  @ skid00skid00's post |  #3

Photoshop's ACR does indeed seem to do a better job on these pictures than Photoshop Elements' version (couldn't try DxO as it tells me I have installed it before and cannot get a new trial :-( )

#1. Whole image with Photoshop ACR converting from TIFF:

IMAGE: http://farm4.static.flickr.com/3612/3422762313_da47b9f68b_b.jpg

#2 Top left corner
IMAGE: http://farm4.static.flickr.com/3557/3423569282_b81403ee53_o.jpg

#3 Top right corner
IMAGE: http://farm4.static.flickr.com/3350/3422762455_883fd51d3b_o.jpg

Mind you, I'm not sure it is cheaper than buying a new camera :D

regards,
/alan

Falkirk, Scotland.
Project 365 Blog (external link) | flickr (external link)

  
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Karl ­ Johnston
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Apr 08, 2009 03:24 |  #4
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Did you try and use the chromatic aberration reducer tool in DPP?


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alan_potter
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Apr 08, 2009 03:42 |  #5

Are you meaning the Lens correction area, the lower half of the third tab (sorry, I don't have DPP in front of me now and can't remember the exact name).

If so, then this is disabled with SX1 RAW files... I don't know why, nor whether Canon intends to enable it in future versions.

regards,
/alan


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SX1IS And Purple Fringing (warning: a couple of big pictures)
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