size mismatch pixel layer vs document

[NotMyFault]

Th attached file contains a 32x32px pixel layer. The Documents says it is only 31x32px large. If you copy the layer and create new form clipboard, the wrong document size will be shown again.

As the layer contains 32x32 pixels (black/white alternating), it cannot be only 31x32px.

 

 

31x32 bug.afphoto

[Hangman]

13 hours ago, NotMyFault said:

As the layer contains 32x32 pixels (black/white alternating), it cannot be only 31x32px.

It looks like a glitch in Photo with that particular file...

• Open the same file in Designer or Publisher and the Document Setup shows it as 32 px x 32 px.
• The Export dialog in Photo also shows it as 32 px x 32 px.
• Creating an identical document in Designer and opening it in Photo and it shows as 32 px x 32 px.
• Exported as a png or jpeg file and it shows as 32 px x 32 px.

[NotMyFault]

3 hours ago, Hangman said:

It looks like a glitch in Photo with that particular file...

• Open the same file in Designer or Publisher and the Document Setup shows it as 32 px x 32 px.
• The Export dialog in Photo also shows it as 32 px x 32 px.
• Creating an identical document in Designer and opening it in Photo and it shows as 32 px x 32 px.
• Exported as a png or jpeg file and it shows as 32 px x 32 px.

The export shows the wrong size, too if you remove the rectangle which I added only as helper object to measure the size.

[Hangman]

Did you create the file in Photo originally or in Designer, prior to rasterising the black and white pixel grid?

[walt.farrell]

Also, how did you create that pixel layer? You often play around with PT filters, for example, and it's likely that the method you used is related to the issue.

By the way, the thumbnail for that file is very odd in Photo 2 on iPad, and the file took a relatively long time to open.

 

[myclay]

38 minutes ago, walt.farrell said:

the thumbnail for that file is very odd

Best guess; the image for the Explorer thumbnails (128x128,256x256,512x512) need to be generated while the original image is too small.
this is the result when you upscale it to 512x512 Bilinear The averaged result in the middle is odd, maybe Affinity has used a tiling method like Affine to fill the thumbnail image? This preview thing also happens on windows.

 

The 31x32 within Affinity is truly odd, copy pasting that pixel layer into Paint results in 32x33px.

[NotMyFault]

I create the source image by

• rectangle 32x32px
• PT filter with osci(x,y), nested as child
• Duplicate (to keep the source layer)
• rasterize
• rename

the thumbnail is direct product of wrong size / dpi.

The whole issue is that at a unknown step Affinity remembered a wrong dpi for this layer. I noticed this only later after multiple duplicates and using the copies to stretch them, that DPI was off by 1 and nailed it down to the source layer.

What I can’t understand is that a layer which contains exactly 32x32 pixels is missratend as 31x32px. You can’t store 32 individual pixel in a layer with 31px. It would lead to the thumbnail with mainly muddy grey.

[carl123]

On 6/2/2023 at 9:14 PM, NotMyFault said:

As the layer contains 32x32 pixels (black/white alternating), it cannot be only 31x32px.

Rasterise & Trim the black/white alternating layer

[myclay]

Rasterizing and trimming is helping to fix the symptom but maybe not the root cause?

I tried to replicate the bug but wasn´t able to get your error but when you scroll thru the history, the equation is vanishing in the first procedural Texture layer. Backwards scrubbing thru history keeps it intact but going forwards from step 0 it vanishes.
Seems like copypasting formulars could be a culprit.
32x32 test.afphoto

Edited June 4, 2023 by myclay
tried to rebuild error.

[NotMyFault]

For this who want to investigate deeper.

The issue started in another document (which I used as source before copy/pasting int a new doc), uploaded here with history.

The screenshot shows the step where wrong DPI was observed the first time.

I changed the size of the pixel layer in multiple small steps from 32 to 64, observing the resulting blurriness. When it reaches 64px it should show 72DPI, but shows 71 DPI.

 

one possible cause is that i repeated a process to show gaussian blur on alpha, added a group, added a blur filter, inverted the mask. Later deleted those objects, but I duplicated the pixel layer when it was residing in the group, and my special blur filter rona alpha was active (on group level).

 

32x32 dpi mismathc first.afphoto