Add Border Edge Artifact

[jfoster]

AddBorderProblem.jpg (37.49 KiB) Viewed 4293 times

I used the Add Border transformation to add a border to the left and right of an image, in preparation to warp a portion of the left and right edges of the image so that I would end up with an aspect ratio that I required. As shown in the screen-shot, even though the border pixels were only supposed to be added to the left and right edges, there is a white artifact added to the top of the resulting image.

Jeff

[jsachs]

This may be an artifact of the display and not part of the underlying image. Does it go away at 1:1?

Unlike PWP 7 which zooms in past 1:1 by pixel replication, PWP 8 allows non-integer zoom factors so it fills the available space when zoomed to fit. The resulting image resampling can produce artifacts like the one you are seeing if you zoom past 1:1, but they are not part of the image. For photographic images, this is usually not noticeable, but for extremely sharp edges you can get a 1 pixel edge blur.

[jfoster]

_G7H0954_DxO_Nik v7.jpg (20.48 KiB) Viewed 4285 times

No. It's in there. See attached image.

[jsachs]

OK, I do see a difference between PWP 7 and 8 -- I'll take a closer look.