Horizontal lines on image after edit

Forum|Forum|5 years ago
August 31, 2020
3 replies
5700 views

Hello, I have this problem where after editing image, when you zoom in very close the whole image is covered with these barely visible horizontal lines. On my raw files I do not see them. Would anyone have any idea how to get rid of these lines? Thank you for all your help/feedback..

How to

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Clive25340573px5f

Participant

I too am experiencing these lines, just as shown in Sławomir5CBF picture below. They seem to appear if you try to save an image as a jpg, then go back and tweak it, and re-save. It only seems to take two or three 'resaves' before they appear. At the moment I am doing more or less all the processing in raw and saving the image into jpg at the last possible moment.

D Fosse

Community Expert

And that is the correct way to do it.

Never resave a jpeg if it can be avoided. The jpeg compression algorithm is destructive, non-reversible and cumulative. It degrades with every resave. To make matters worse, the jpeg spec only supports 8 bit color depth, which is the primary reason for banding like that shown above.

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Clive25340573px5f

Participant

Thanks for that - so there you have it, never tweak images after processing, however much you may be tempted to do so! Best wishes.

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Brianm1

Participant

Can anyone tell me why I'm getting these lines in my photo after I edit and save the photo? It happens everytime.

JJMack

Community Expert

That is called banding. By any change did you saved the image as a GIF them open the gif in Photoshop? Did you ever change the document mode to Index color? Gif index color only supports up to 256 colors so gradient areas like sky's will most likely have banding like you show when the sky gets mapped to 256 index colors. If you apply filters and adjustments to gradient area banding is also likely to happen, You should first covert the document to 16 bit color. You will not gain color but gradient are process smoother when there are more colors available you should not see banding like that. Do you have the original Image to recover the lost colors?

JJMack

Semaphoric

Community Expert

It could also be an 8-bit image with the shadows lifted a lot. If it were darker overall, the Moon should have more detail as well. As long as the images of the planetary discs were enough pixels in diameter to not be lost in the sky.

JJMack

Community Expert

That Photoshop Pixel grid when you zoom in that far to can edit each pixels. Zoom in more the pixels will be displayed even lager the is a limit you to how far in you can zoom in. The lines are not ima your image. Its an overlay Ctrl+H will hide the overlay