Lightroom 5 Export Issue - Artefacts / Pincushioning on Images

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  • Updated 4 years ago
Hi, not sure if anyone can help? I've got an issue when exporting full size Jpegs in Lightroom 5.

I've been having a live chat with Adobe support for the last 4 hours but they are unable to help with my issue.

I'm exporting my NEF files, for printing purposes, to Jpeg using the following settings:

Jpeg

sRGB

Quality 100

Resolution 300 ppi

Sharpen for Matte - Standard

My images which are having the issues have been straightened using the crop tool in LR and when I then view the the image, using Preview on my mac, it washes out the image displays loads of strange artefacts as shown in the picture. The original RAW image doesn't contain these artefacts at all so I'm not sure what is happening after the import. Adobe just kept saying Jpeg is worse quality than RAW and didn't seem to have a clue about the issue.

Not sure if this is a bug in the latest build of LR but any help or advice would be greatly appreciated.

The image I've included is a screen shot to show how it looks using preview on my iMac.
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Damion Bridson

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Posted 4 years ago

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Steve Sprengel, Champion

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I think the image is being oversharpened at the very small detail level and so you're seeing aliasing or a moiré pattern where the 300DPI resized-down is almost a multiple of the screen resolution.

What does the image look like at 100% or 200% zoom in Preview if you have a way to do that? Does it have a fine regular pattern?
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Damion Bridson

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Thanks Steve for the reply.. I think you are bob on with your solution. I reduced the sharpness in the development module to zero and exported the image using the same settings and the image is now perfect - no pattern at all - just the grain that's visible on the RAW file.

Steve - in response to your question - I could see the patten when I zoomed on the Preview using the problem file.

Thanks again, I'll see if I can sort out the problem images now and remove the sharpness down to zero or see if I can find a sharpening amount which will work happily with Jpeg 300DPI export.
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Steve Sprengel, Champion

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An image should be "output sharpened" (what you do during Export or Print) when it has been resized to the final size for printing or display, not at the native size that has no relation to the final size. For example, a 4x6 image @ 300dpi would be resized to 1200x1800 and then output sharpened then printed, while an 8x10 @ 300dpi image would be cropped to a 4x5 ratio in LR, then resized to 2400x3000 then output sharpened then printed. The Print module in LR does the resizing and sharpening and printing all together as you print each image. With the Export module you can maybe resize and maybe sharpen an image without printing it, so you do need to know the output media size before Exporting if you are going to resize and apply output sharpening. If you don't know the output media size then don't resize and don't sharpen.