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plantuml / plantuml-server

PlantUML Online Server
https://plantuml.com/
GNU General Public License v3.0
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Plantuml.com images generate as webp not png #255

Closed jneis-at-hilscher closed 1 year ago

jneis-at-hilscher commented 1 year ago

Today I encountered an issue with PNG images generated using the online server.

I generated the image by using the PlantUML VSCode extension. I selected "PNG" as output type and the file saved with a .png extension. When importing the generated image into a LaTeX document using \includegraphics{} I get an error from libpng stating that the image is not a PNG.

When attempting to manually generate the image it appears that all PNG images are generated as webp now. This can be replicated as follows:

I could not find any documentation of this change and would ask that it is reverted as it potentially breaks anything relying on PNG files as webp is not a drop-in replacement.

This issue seems related to #254

A workaround for now is opening the image with GIMP and saving it as PNG again.

arnaudroques commented 1 year ago

Ok, we've set up a temporary workaround which should just work. Can you try and tell us? Thanks!

svermaji commented 1 year ago

Hi Team - I just tried and still plantuml is saving as webp. Even png option is saving image as webp.

arnaudroques commented 1 year ago

I know this is strange, but if you use URL from outside our webserver, you got PNG. For example, try to save this: https://www.plantuml.com/plantuml/png/SoWkIImgAStDuNBAJrBGjLDmpCbCJbMmKiWiLYZ90185UUdsN0wfUIb0DG00 and you'll get PNG.

However, if you go to our webserver directly with the very same data: https://www.plantuml.com/plantuml/uml/SoWkIImgAStDuNBAJrBGjLDmpCbCJbMmKiWiLYZ90185UUdsN0wfUIb0DG00 you'll get WEBP.

Since plugins (as PlantUML VSCode extension) directly generate URL, they should get PNG (tell me if I'm wrong), so they should work.

Does it help?

svermaji commented 1 year ago

Thanks for suggestion. It is not working when I am trying same or nearby tab on Edge/Chrome. But if I copy png url and try on incognito window, its working. This can be used as workaround. Thanks