How do I eliminate thin lines between pattern tiles & create a truly seamless pattern in Photoshop?

[Joelle27010918n71y]

Help!!! I'm creating "seamless" patterns in Photoshop, but I keep ending up with slender gaps / white lines when I try setting up a tiled pattern on POD products. What's the solution to get rid of these lines?

[c.pfaffenbichler]

Please provide th eimage you use to create the Pattern. 

Is it possible you scaled it down before defining the Pattern – thus introducing Anti-aliasing on a non-Background Layer? 

[DamienKeffyn]

I have this problem also when I am manually trying to place tiles after scaling down....it doesn't matter what I do. There is always a thin line between the tiles/layers and even flattening the image doesn't get rid of them.

[Stephen Marsh]

@DamienKeffyn 

A sample file of the tile used for the repeating pattern would be helpful.

[DamienKeffyn]

How do I upload it, the file is too big?

[Stephen Marsh]

The forum allows 47MB attachments.

Why would your tile be larger, what pixel dimensions is it? What file format?

Your CC account includes storage space, or there are options such as DropBox, OneDrive, GoogleDrive, WeTransfer etc.

[DamienKeffyn]

I use these tiles to print on fabric so they need to be large and have 300dpi. This particular tile is 50x50cm

I will upload to google drive and send a link

[DamienKeffyn]

Link to file

https://drive.google.com/file/d/1twx80VRIW6Xl3R8wjBatoPNoNrrYa1ze/view?usp=sharing

[c.pfaffenbichler]

Why did you create the edges like that? 

As a work-around you can try Layer > Layer Mask > From Transparency and Layer > Layer Mask > Delete 

[DamienKeffyn]

I didn't. the original file size was 25.4cm x 25.4cm....I made it 50cm x 50cm and this is what happened.

[c.pfaffenbichler]

I didn't.

Then who did?  

What was the original file format? 

Did you not convert the Layer to a Background Layer before scaling? 

Which Reample Method did you use anyway? 

[DamienKeffyn]

I have never had to do that before with any files I have received.

I use the Image size to resize the file.....

[Stephen Marsh · Accepted solution]

If you resized two separate files, the first file using nearest neighbour interpolation (possibly ugly result, but better edges), then resample a second file using bicubic or whatever better interpolation, then layer the second over the first to hide the lower result but retain the edges.

[c.pfaffenbichler]

If you resized two separate files, the first file using nearest neighbour interpolation (possibly ugly result, but better edges), then resample a second file using bicubic or whatever better interpolation, then layer the second over the first to hide the lower result but retain the edges.

By @Stephen Marsh

Just converting to a Background Layer before resampling should suffice if there is no intentional Transparency anyway. 

[DamienKeffyn]

Yes! This works! Thank you so much! It has been driving me crazy for months trying to figure out how to fix it.

[Stephen Marsh]

You're right, no edge anti-aliasing on a flattened image as there are no transparent pixels.

[DamienKeffyn]

This is the original file in the original size.

https://drive.google.com/file/d/1MGNyH0locpdCpA8ZPfUM3YTKYaqx5B97/view?usp=sharing

[c.pfaffenbichler]

This is the original file in the original size.

https://drive.google.com/file/d/1MGNyH0locpdCpA8ZPfUM3YTKYaqx5B97/view?usp=sharing

By @DamienKeffyn

So you did do it … 

[DamienKeffyn]

Please explain to me how I did it...because I haven't touched any settings apart from changing the size to 50cm....I haven't asked the file to create semitransparent pixels...it's doing that on it's own.

And this wasn't happening a few months ago. I haven't changed the way I have done things, I haven't changed any settings. So how is it doing it?

[c.pfaffenbichler]

But it does matter what you do. 

You introduce semitransparent pixels on the edges by downsampling a non-background layer with a Resample Method like »Automatic«? That would be your doing and you could avoid it. 

[DamienKeffyn]

I literally open the file as I received it, resize it, then copy and paste it into a new tile to create a seamless pattern.....and this happens.

How have I created this when I do not touch any settings anywhere and a few months ago I never had this problem it has started happening out of nowhere and I can not figure out how to make it stop.

[davescm · Accepted solution]

Damien

You said '....I received it, resize it, then copy....'

Resizing to alter the number of pixels is re-sampling. Hence c.pfaffenbichler's comment on what happens when you resample using automatic on a layer that is not a background layer. If you have not seen it in the past either you were using a different resampling method or you were working with a background layer.

Dave

[DamienKeffyn]

Thanks Dave, that makes sense! 

[Joelle27010918n71y]

I've been making patterns that I thought would be seamless, but they always seem to end up with a white line (slender gap) between the tiles when I try creating POD products. What am I doing wrong? Is there a way to eliminate those gaps? (Note: I'm not adding guidelines when I design the patterns)