Lineart in Affinity suite gets aliasing in photo persona

[Porridge]

Hi

I am a long time Adobe user and work with comics. I am exploring Affinity on Ipad as an alternate solution for publishing comics. I have been trying to wrap my head around a problem and hope someone can help me.

The way I prepare line art for coloring in photoshop is to scan the drawing, apply treshold to the line art and delete the white fields, and then color on a layer underneath. I am trying to figure out the same process for affinity. From the get go when I import a file it looks worse in photo, more pixellated and less high res.

If I apply the treshold adjustment and apply it it looks the way I would expect in designer and publisher, but has a pixelated differently colored edge in photo. This was a rasterized file in the first place and high resolution, so there is no vector to raster mumbo jumbo. After the treshold-operation it looks like I would expect it to in all other modes than photo, which makes me think that the layer still is high res, but is displayed as low res, or that it becomes embedded in the photo persona as screen dpi(72). I have seen some articles saying to change display modes in the preferences, but that is the desktop version of affinity and I could not find those settings in the IOS version. 

What I would like is a high res line art layer tresholded to only be either black or white, with the white removed, so that I can color it in affinity.  I tried re downloading Affinity 1 and repeated the exact same process with the exact same file, and there it works like it should, which makes me scratch my head even more.

I am currently editing some comics my students are working on, and will attach some screenshots of the line art.

Also. How do I clear or delete something. I saw that in the desktop version you can make a selection and press backspace to delete. On ipad there is no backspace and the button that has the shift key does not have backspace either. 

Hope someone can help me clear this up. Any help is appreciated.

Edit: Tried this on affinity photo 2 where it also works like it should. So the problem is only in the photo persona of the publisher app.

 

Edited November 15, 2023 by Porridge

[stokerg]

Hi @Porridgeand Welcome to the Forums,

Could you attach the PDF you are placing into Affinity to the Forums or upload it to our Dropbox here and I'll see if can replicate the issue and get it logged with the developers.

I did try replicating this and wasn't able to but I suspect it's more to do with the file I was trying with.

[Porridge]

Hi

 

The file is attached. I also scanned this in Tiff and had the same result. And had the same result with a file i saved from procreate. I did not have the same problem in the affinity photo app. Only in the photo persona in the publisher app. Could you send the file you used to check that did not have the same issue? I can test to see if I have the same issue with that file. Hopefully there is a setting on my ipad or in affinity that resolves this for all files. I don`t think the file itself is the issue since it works well on everything else than the publisher-software in that specific mode.

 

Thanks so much for helping me. Greatly appreciated.

 

Best

Johann

Maria_1.pdf

[Porridge]

Small update. Tried the desktop version of affinity. Same procedure with the same file. Doesn't have the same issue. So it is only on ipad with affinity publisher and personas specifically. 

[Porridge]

Posted this in bugs in IOS and got replies there, and a fix. If document uses mm not pixels, and the layers are not aligned in whole pixels this happens. What solves it is to change to pixels in document setup, make sure pixels are not fractional. Then make sure the page is not aligned in fractions. That solved it for me.