In PureRaw2, the lens profiles worked well, although when re-importing into Lightroom, I would have to turn off the profile in LR or the image would be double corrected.
In the latest version of PR4, the lens profiles seem to be quite out of whack. I am using a Canon R5 and RF 16mm f/2.8, which has a lot of barrel distortion when uncorrected. PR2 corrects the distortion fine, left image, but PR4 is poor.
This is also a problem with a friend’s Sony A6600 and Tamron 18-300.
If I turn off the LR profile I get this:
Wheter the black wedges appear around an image or not depends on how crop is set in the export dialog. Older versions just crop to exclude the wedges, newer versions can include them, which might be beneficial for further processing and cropping with other apps.
Hi Platypus
Here are two photos exported from PR4 into LR. The first has the lens profile applied, the second has the lens profile applied and cropped to give a full frame.
Note how the size of image reduces from 8192 x 5462 to 6901 x 4600 (31,7 MP).
And here is the cropped PR4 image compared to an uncropped image in PR2, which retains the full 8192 x 5464 size. I appreciate that PR2 (and LR) have upscaled the file when applying the lens profile, but I prefer that.
Interestingly PR4 applies a different tone curve, protecting the highlights which I prefer - the only difference is that the PR2 image LR exposure is +.75 and that for PR4 is +1.37 to make the foregrounds equivalent.
Problem solved: In the lens distortion check box, check “Image cropped to original ratio”.
Good, you found the setting that gives you what you want.
If we take your example, barrel distortion can be corrected by
- fixing the corners and pulling the edges in
- fixing the edges and pulling the corners out
Depending on which method has been applied, the cropped image gets smaller or can stay as is. Also, pixels need to be re-made by averaging or by creating additional pixels. Both methods therefore introduce some pixel level imperfections for the sake of perfection of the full image. Whether a landscape photo needs distortion correction is a matter of personal decisions. A slightly bent horizon does not matter that much, unless it is bent “the wrong way”. If important horizontal or vertical lines are kept at half the image height or width, they should stay straight anyway.