Lightroom: Strange "grid" is shining trough my jpeg after export

  • 2
  • Problem
  • Updated 3 years ago
  • (Edited)
Hi!There is a really strange problem by exporting a photo in Lightroom!This is just happening to some of my landscape format photos and it never happen before.There is a grid shining trough on the Jpeg when you do the Lightroom export.
This photo was processed in Lightroom first,then exported from LR to Photoshop,sharpened and stuff and saved back as Tiff. to Lightroom.
Now,when you export it from LR the Browser is automatically showning the Jpeg and there you can see the problem-the grid!
Going back to Photoshop and saving the photo with the "save for web"option,there is no grid at the Jpeg in the browser...WHAT IS THIS!!!???
My Camera,Canon 5D Mark II is working fine,my Lenses too,don ́t have any problems-maybe this photo was made in a "unlucky"situation,like temperature was harming the sensor,or something like this?
On the images you can see the 2 exported files...

Greetz!

Adam
Photo of adam kroll

adam kroll

  • 8 Posts
  • 0 Reply Likes

Posted 3 years ago

  • 2
Photo of Steve Sprengel

Steve Sprengel, Champion

  • 2587 Posts
  • 323 Reply Likes
I am unsure what you're referring to as "a grid shining through".

Are you taking about something as small as the pixels or a periodic band or line every so-many pixels?

Where should I look to see what you're referring to: the sky, high-contrast edges, where?

Do both pictures have it or just one, and which one?

The difference I see in the pictures is the first is slightly larger and perhaps oversharpened. whereas the second one is slightly smaller and less sharpened.
Photo of adam kroll

adam kroll

  • 8 Posts
  • 0 Reply Likes
Hey Steve!
Thanx for your words!
Yes,that ́s right,one is more sharpened then the other-before I ́m exporting a photo from LR,I ́m still putting some more sharpness on it-what that means is,that the "grid"photo is sharpened twice,by LR and PS.The photo without the grid is sharpened just by PS.
Sorry about my english,but you must know,I need a "simple way" of explaining things to me,he,he....Sorry....
Photo of Steve Sprengel

Steve Sprengel, Champion

  • 2587 Posts
  • 323 Reply Likes
What do you mean by "grid"?

You've explained why one is sharper than the other but that's not what you're posting about, I don't think, and I don't see anything different or wrong with either of them other than the level of sharpening and the slightly different size.

If you can't explain what "grid" means with words, maybe add notes (text or lines) on the photo with the grid pointing to what you're calling a "grid".
Photo of adam kroll

adam kroll

  • 8 Posts
  • 0 Reply Likes
I ́m sorry Steve,but I personaly can even see the"Grid"here on this small photos in this blog,so I really don ́t know if you are the right person that can help me?:)

Thanx anyway!
Photo of adam kroll

adam kroll

  • 8 Posts
  • 0 Reply Likes
Maybe "light stripes"are better then "grid"...
Photo of adam kroll

adam kroll

  • 8 Posts
  • 0 Reply Likes
The "light stripes"are coming by this settings in Lightroom.
Photo of adam kroll

adam kroll

  • 8 Posts
  • 0 Reply Likes
Photo of Steve Sprengel

Steve Sprengel, Champion

  • 2587 Posts
  • 323 Reply Likes
Ok, I finally see something. In the first image that is slightly larger, there is vertical banding in the dark roadway along the bottom. I was mostly looking in the sky and reflective windows where I couldn't see anything wrong, and shining would suggest bright lines, not dark ones, in my mind.

The issue is a moiré pattern caused by the resizing of a sharpened image with fine detail (the stones in the road) to slightly different dimensions.

You can see the same effect if you take a picture of your TV screen or computer display with a smartphone, and depending on the distance, if the photosites in the smartphone camera sensor are almost a multiple of the pixels on the screen then you'll see weird curvy banding.

To avoid this situation, don't resize the image to something that is similar to but only slightly different size the input image and maybe don't sharpen the input image before resizing.

I think what's happening, here, is that you're using an imprecise size of 1.6MP instead of using the same pixels dimensions as the input image.
Photo of adam kroll

adam kroll

  • 8 Posts
  • 0 Reply Likes
Ahhh...Ok,so this is very interesting what you said now!Thanx for that Steve!
But I really can ́t understand,why other photos,with exactly the same processingand the same workflow don ́t have this "banding"problem?It did ́t happen to me for 3 years now,it ́s the first time!
In the export options(see the screenshot)there is already the option activated:"Don ́t resize",hm....
Next days there will be a real photoshop expert in my house,so I hope he can find out exactly the problem...

Have a nice weekend Steve!
Photo of Steve Sprengel

Steve Sprengel, Champion

  • 2587 Posts
  • 323 Reply Likes
Please supply your original image for testing, the one last imported into LR before re-exporting and seeing the problem. This would be a disk copy of the TIFF, I believe. It'd be too large to attach to a message, here, so upload it to www.dropbox.com and post a public download link, here.

What you have in your initial reply are the resulting images from Exporting from LR and Save for Web from PS, neither of which is the original image.

I still stand by my analysis that you're seeing a moiré pattern but I am unsure of the original image size, now, so cannot know if the original image was only slightly different than the Exported size or if it was much larger and perhaps slightly different than a multiple of the exported size which might also cause a moiré pattern.
Photo of adam kroll

adam kroll

  • 8 Posts
  • 0 Reply Likes
Hey Steve!

Sorry for my late replay,was "out of office"for some time...
Well,the problem seems to be the extrem sharpening!Tried out every way of export,like in Lightroom and in photoshop,nothing helps!There seems to be a limit of sharpening the micro contrasts,so the pics are getting this artifacts...Of cause they look different on an retina display on an ipad then on my monitor and stuff,but like I said,there is this professional Photoshop artist coming soon and then we will take the time to find out the problem...
In the 2 first pics on my portfolio(Incentives)you can maybe also see this artifacts because of the hard sharpening?The banding was just on some other pics...

Steve!Thank you so much for helping me with my problem-I will give you a report after my friend Tom will find the problem,ja?

Wishing you a marry christmas and a happy new year!

Greetz

Adam
Photo of Rodrigo Mattos

Rodrigo Mattos

  • 1 Post
  • 0 Reply Likes
Mello,

I'm also having the same issue with this grid lines showing up on some pictures I've taken.

I have already tried reducing the sharpness setting, but that didm't seem to solve the issue.