[PNG file export size is limited]

Sorry about the double message, but I found some more information:

The size limit for the export with the GDI isn't documented and may depend on the windows version, see here: https://rdrr.io/r/grDevices/windows/png.html

But you may note that JPG and TIFF export with affinity doesn't have this limit (JPG is only limited by their file format)

[PNG file export size is limited]

Hi @stokerg and thanks for your answer.

I saw what you linked, but it doesn't help me at all. First, I can't accept the answer "The best solution is to reduce the DPI/PPI export setting. No one is going to view an image of that size". To give you my example, I work on long image strips, and we read them on specific readers  by scrolling. Its frequent to have a big height, and I absolutely don't want to reduce the quality of the picture!

There may be a GDI limitation (but not for the exporting, unless you use the GDI to export in PNG, but you may easly use something else), but I don't see why Affinity would be unable to bypass this limitation. As others have said, PNG filetype doesn't have such a limitation.

Lastly, the link speaking about a limitation isn't sourced and is 15 years old. Furthermore, it doesn't mention a limit in exporting, but simply a limit for viewing.

 

[PNG file export size is limited]

Greetings,

 

I'm working on quite large files, and I'm not able to export those files in PNG.

For you tu understand, here are the simple steps you can do to reproduce the problem:

- Create a PNG file with another software (Krita, Photoshop, GIMP), of size 1600x70928 (the size is not specific of course, but I tried with that)

- Open the file with Affinity Photo (version 1.10.5.1342)

- Open the export window, PNG tab, and see the warning text telling PNG can't be more than 32767px (see attached screenshot, in french)

- The exported image is resized (I don't want that)

 

What is expected:

- Be able to export PNG file without this 32767px limitation: a lot of others software can do it without problem (tested Krita, Photoshop, GIMP and python PIL)