APhoto - Are Merged Joint Lines Visible on Prints?

[jubro]

I am snapping into alignment & merging photo images. But there are visible 'white' (are they transparency or pixels?) joint lines between what were the individual images before they were merged. (I am performing multiple merges as explained below).

Is this a specificly set width of pixels? Is there a way to join images without leaving a visible joint.

I am beginning with an A0 print preset & 1 square photo image. I create 3 copies of the photo image & create a larger square from them, snapping them together (red & green lines indicating h & v alignment) & merging visible. I repeat this  process with the new square, & finally create the last merge from 6 copies of this final created square. The resulting image comprises 96 of the original image.

The image created will be used for a pattern to be printed on cloth, & of course it's not suitable for the joint lines to be seen.

[MEB]

Hi eightysevens,
Make sure the image's  X,Y coordinates and dimensions (width/height) are integer pixel values. You may have to go to Affinity Preferences, User Interface tab, Decimal Places for Unit Types section and change the Pixels value to 2 or more so you can see more decimal places in the Transform panel (and elsewhere)

[jubro]

10 hours ago, MEB said:

Hi eightysevens,
Make sure the image's  X,Y coordinates and dimensions (width/height) are integer pixel values. You may have to go to Affinity Preferences, User Interface tab, Decimal Places for Unit Types section and change the Pixels value to 2 or more so you can see more decimal places in the Transform panel (and elsewhere)

Great! That solved my issue thanks MEB. What actually changes by adjusting that setting? (I set pixels to 2).

[jubro]

12 hours ago, MEB said:

Hi eightysevens,
Make sure the image's  X,Y coordinates and dimensions (width/height) are integer pixel values. You may have to go to Affinity Preferences, User Interface tab, Decimal Places for Unit Types section and change the Pixels value to 2 or more so you can see more decimal places in the Transform panel (and elsewhere)

On closer inspection I have noticed that the lines have not gone. The first design I tried they just weren't so visible, but on a 2nd design I just made they are obvious, I have tried moving the pixel value to 3 & to 6, but get the same result. It's also strange that one design I made with the same process has come out okay, (a 24 image construction, though others with 24 have not), before I altered the pixel value.

[MEB]

Hi eightysevens,
Increasing the Pixel value in the Decimal Places for Unit Types section just displays more decimal values in the Transform Panel. It actually doesn't change anything in your work. To fix the issue you have edit the X,Y coordinates there (assuming that's were the problem is)- deleting the decimal part - so the object's coordinates are on integer values/fully aligned with the pixel grid. When this happens those thin lines disappear. I can provide an upload link if you don't mind sending me the file to confirm that's the only issue there causing this (if the object don't have integer width/heigh dimension this can also happen).

[jubro]

MEB, thanks for indicating the existence of the Transform Panel. With some figure tinkering there I have solved my joint lines issues. Thank you very much for your time!