To Polygon Thank you for your suggestions and fast respond. I will use the default transparent background to avoid further confusion and draw a white block as white background in preparation of any word to pdf conversion. Also learnt a lesson: always covert the files to the final format (in my case)...

To Polygon,
Can I use a white background directly (change alpha channel to 255)? Will this raise problems later?

Many thanks!

Thank you Moini and Polygon! I have confirmed that the alpha channel is 0, so the background is transparent. Then it inspired me to change the background to white, then to png, word, then pdf. The pdf showed no mistakes. Attached image. Then I also tried to add a white block as the bottom layer, the...

Hello everyone, I have a question about exporting png file. My purpose: use inkscape to map multiple subjects (tiff and jpg) together, export the combined figure to png, insert the png to word, then convert word to pdf I do not use much vector drawings, except for the arrows and texts. The problem: ...