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I apply it to every photo by default, then selectively un-do corrections as desired. I didn
Quote:
Originally Posted by w349
There are definitely some destructive effects: artifacts, noise, and sometimes a noticeable loss of resolution/detail. Same for many other post-processing operations (e.g. horizon leveling, contrast adjustment).That's one reason why small pixel sizes and high pixel counts are so valuable: with small enough pixels, the artifacts and loss of detail wont be visible in the final print, but the beneficial correction will. No getting around the noise problem, though.
When I used DPP for RAW conversions, I usually applied only peripheral illumination (vignettting) correction by default. Now I use DxO, and I find that it does a much better job than DPP at the lens-sepcific corrections - now, I apply them by default, and remove or modify them when they have an undesirable effect (e.g. barrel distortion correction affecting a face at the edge of the frame).
I use Lightroom 3 and as Daniel and John do, I apply lens corrections by default and then as I sort through the individual images I make the final decision with any other adjustments. I am generally pleased with the LR3 corrections and leave them 99% of the time.
I apply automatic lens correction by default. I more or less always leave the default CA and the vignetting correction settings, but somtimes i adjust/delete the distortion correction, e.g. if the correction cuts a detail close to the border.
(In my opinion ACR:s default lens correction profile for EF-S 10-22 over-compensated for vignetting - the corners were brighter than the center of a blue sky. I made an own profile with slightly less compensation.)
Quote:
Originally Posted by cls
While you may be right that ACR over-compensates for vignetting on that lens, blue sky is definitely not a good tool for evaluating it. There are many natural reasons for sky brightness to vary in ways that look like over-corrected vignetting. It would be much wiser to use a subject that really does have uniform brightness over image height.
Daniel: Yes, you
Thanks for all the replies. I
RAD! My 17-55 is probably my most used lens. Good buy.
Is DPP meant to have settings for lenses pre-set?
Theres a section of the LR/Lens editing tab that I don
<div>Quote:
Originally Posted by ham
Yes, DPP incorporates lens-specific corrections. What version of DPP are you using?
For a RAW file on the NR/Lens/ALO tab, you should have access to the ALO checkbox and slider, the RAW luminance and chrominance NR sliders (but not the TIFF/JPG NR sliders), and the lens corrections. To modify any of the lens corrections (including turning them on and off), you need to click the Tune button, which should bring up a dialog box with checkboxes for each of the corrections, ways to modify them if appropriate, and a viewer window with magnified area for correction preview.
Quote:
Originally Posted by cls
As I understand it, ACR's lens profiles are often submitted by users. So, the 'default lens correction profile for the EF-S 10-22' might have been created by Tom in Topeka, Seamus in Shannon, or Giuseppe in Genoa, and you have no idea if they did it properly. Vignetting correction, for example, requires even illumination (yes, the Adobe FAQ says that it doesn't, but it goes on to say, "...a more evenly illuminated lighting would only help to get a more consistent vignette estimation result," which to me, means even illumination is required). I suspect most people who try to make a lens profile light the charts with one or more lights mostly aimed at the center of the chart - a consequence of that 'center weighting' is that it exaggerates the light fall-off at the periphery. Thus, a correction profile would tend to overcompensate for vignetting, which is exactly what you're seeing.
The inconsistencies in user-submitted profiles is one reason I prefer DxO as a RAW converter - DxO bases their lens corrections on analytical testing under controlled lab conditions, and also provides corrections for specific combinations of camera + lens.
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I have 3.4.1.1
Quote:
Originally Posted by ham
The current version is 3.10.1 - so, you're many updates behind. Version 3.4 was released in early 2008, before the EF-S 15-85mm f/3.5-5.6 IS lens, which is why there are no corrections available for those images.
I'm not sure how you managed to download such an old version from Canon UK, but here are the Canon UK links for the current version for Windows and Mac OS X.
I have no idea either. Thank-you very much indeed.