Capture One 21 bad at lens distortion correction??
I've been using C1 for years now and I generally love using it. One thing that has always bugged me though, is how clunky the lens distortion correction is (in my case at least).
Let me explain my situation:
I'm shooting RAW with the Canon R5 and the 28-70 f2.0. I do quite a bit of interior/architecture photography, so good distortion correction is vital. I import the images into C1 and even though the correct lens profile is selected (and "Disable default lens correction" is NOT checked), I still see a ton of barrel distortion. And it's not easy to correct. If I drag the "distortion" slider to correct for the horizontal lines, the vertical lines get out of whack and vice versa. I thought maybe this lens just has a lot of barrel distortion, but when I open the exact same image in Canon's own raw software (DPP4), there is almost no barrel distortion and it's easy to fix. So obviously something is happening or missing in C1 that seems to be working correctly in DPP4.
This leaves me wondering, is C1 just bad at lens distortion correction or am I missing something?
-
Did you try the "manufacturer profile" of the lens' profile selection? I had the strange effect on a Nikon 14-30/4 Z, this lens is distorting to the question "why are they asking money for such a poor performance?" but the manufacturer profile works better than C1's. The last question was meant to both participants, Nikon and Capture One...
0 -
it should be obviously that a "pro" software cares to have decent lens correction profiles but this is c1... I would give dxo pure raw a try when your camera lens combination is supported, best lens correction on the market, better demosaicing than c1 and of course lightyears ahead NR.
0 -
This appears to be related to another problem in Capture One. I don't want to latch on to this with my own Capture One trouble, but just for information. I recently got this reply from support after contacting them about problems with the keystone tool (i.e. lines that should have been parallel but aren't, angles that should have been right but aren't):
"As you might know, we are aware of this, but this is not a bug and expected behavior, so technically – this requires a design change and not a fix.
This is not an easy task and doesn't get a lot of priority, as the current design works in tandem with other areas of the application (e.g. lens correct)."If the keystone tool has this apparent design flaw and it works together with lens correction, then it might not be impossible that this design flaw also affects lens correction.
0 -
I've been also disappointed with the keystone tool, until I tried to process the perspective deformations by hand when the automatic corrections don't work. I mean, once you activate the keystone tool, set the relevant cursors to the desired values. Now, I am satisfied with the tool.
I am not sure keystone and lens corrections algorithms are related, as lens defects have nothing to do with perspective corrections.
0 -
they are related in the way that they come from the very same people and both suck and also there are user which do a little more than one image at a time and than this broken tool more than sucks......
0 -
In theory one would expect Canon will be using their own lens correction values in DPP4 (and for in-camera produced jpgs), so it may be interesting to use the "Manufacturer" profile in a variant of some of the images with which you see the greatest problems in order to compare the results.
One would, of course, hope and expect that Canon had produced a good correction profile for the lens in question.
I had lower expectations of the results from the camera and lens(es) of a smart phone and although the DNG files it produced were acceptable for what it was, any attempt to make an adjustment when the profile was set to "Manufacturer" produced no change at all.
The 2 "Generic" offerings, on the other hand, produced some extreme adjustment to a point that it looked like the entire lens might wildly "off-centred" in terms of adjustment values. Quite the strangest thing I have seen from any sort of lens correction.
I have a slightly later version of the same phone with the same lens set (reportedly) and the same (so far as I know) software running the camera(s).
Images from that newer phone do not seem to have a recognised "Manufacturer" profile although they still exhibit much the same typical distortion that one might expect from a "wide angle" lens of mobile phone size. The default C1 "Generic" distortion correction options seem to work normally with images from that phone., although the level of distortion provided is quite extreme even after correction. As one might expect.
In both cases, any use of additional correction including keystone and, to some extent, Rotation, were affected by the lens correction adjustments and limited in what they could deliver. In effect the results still looked slightly "decentred" with the newer unit but much less wildly than the older one.
So it seems reasonable to conclude that lens correction is likely to be a basic and important part of all other types of image adjustment but that Manufacturer corrections are not necessarily going to offer a fully usable adjustment starting point in all cases. One would, however, expect the major, traditional camera manufacturers to deliver better and more consistent results than manufacturers of phones with cameras.
0
Post is closed for comments.
Comments
6 comments