Photoshop: Smart Sharpen adds a light vertical line in image

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  • Updated 5 years ago
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  • (Edited)
I am using CS5 (12.0.4), Mac 10.6.8. Created an image from two images side by side. Adjusted second image so it butts exactly to first image, looked at 300%, it's perfect. Flattened image, applied Smart Sharpen, 200%, radius 1, Remove Lens blur, but now I have a white vertical hairline the two images meet, visible at 50%, that was not present before.

How can I avoid this weird effect? If I overlap images more, overall size will be off.

Thanks.

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Robert Ripps

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Posted 5 years ago

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Chris Cox

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That does not appear to be an added line, but just strong sharpening.
That is the kind of result you would expect when sharpening across a strong dark/light transition.
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Robert Ripps

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Hmmm. I have done a few of these, but never seen such a strong effect. If that is the case, then I guess the trick is to sharpen first, then composite.

Thanks.

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Chris Cox

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The sharpening effect would be greatest where there is a large difference in brightness between the sides.

Without seeing the original image, I can't be sure - it is also possible that the images don't overlap and you're just seeing transparency on the edge.
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Robert Ripps

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Okay, from now on I am just doing the sharpening before I combine them, to solve the problem.

Thanks.
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Chris Cox

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Sounds like a safer way to do it.