thin grid lines appear..

The right place to speak and share about your experiences of GraphicConverter
Post Reply
ZalLazkovich
Posts: 5
Joined: Mon Jan 09, 2017 3:34 am

thin grid lines appear..

Post by ZalLazkovich » Thu Feb 21, 2019 3:41 pm

Recently I started having the following problem.
I shoot jewelry on a white foam board. After I upload the pictures to my Mac, I crop and reduce them from 5184x3888 at 300 dpi to 1500x1125 at 72 dpi. When zooming in 100%, very thin grid lines appear covering the whole image. First I thought maybe it was my Sandisk memory card which I use for at least 5 years, so I got a newer Sandisk card. But the gridlines still show. Then I thought maybe the paper of the foam board is the reason, so I photographed a white wall, cropped and resized to the same 1500x1125 at 72, still the same problem.
What could be the problem ? Thanks!

User avatar
forum_adm
Site Admin
Posts: 500
Joined: Fri Dec 23, 2016 9:41 am
Location: Germany
Country: Germany
Contact:

Re: thin grid lines appear..

Post by forum_adm » Thu Feb 21, 2019 4:55 pm

Did you select Best Interpolation for the scaling interpolation?
Also, uncheck gamma aware scaling.

Thorsten
Screen Shot 2019-02-21 at 16.54.39.jpg
Screen Shot 2019-02-21 at 16.54.39.jpg (222.38 KiB) Viewed 81 times

ZalLazkovich
Posts: 5
Joined: Mon Jan 09, 2017 3:34 am

Re: thin grid lines appear..

Post by ZalLazkovich » Sat Feb 23, 2019 12:58 pm

Thank you very much!
It helped. I was using "smooth" scaling for some reason, but remember always used "best interpolation".So, using "smooth" scaling is not good.
Just curious, what it is good for ?

Thanks,
Zal

User avatar
forum_adm
Site Admin
Posts: 500
Joined: Fri Dec 23, 2016 9:41 am
Location: Germany
Country: Germany
Contact:

Re: thin grid lines appear..

Post by forum_adm » Sun Feb 24, 2019 11:23 am

Smooth is a special algorithm. Works best if you scale by exactly 50%.

ZalLazkovich
Posts: 5
Joined: Mon Jan 09, 2017 3:34 am

Re: thin grid lines appear..

Post by ZalLazkovich » Sun Feb 24, 2019 2:31 pm

Thanks Thorsten!!!

Post Reply