Seems that I didn’t describe the problem clearly. Let’s say I want to insert a picture (228 x 196 px) below to the knowledge base.
In the answer editor, I click the “IMAGE” button and upload the above picture file.
Zammad automatically scales the picture display width to the full width of the editor, making the picture blur.
Zammad allows to manually resize the display width of the picture.
Now, problem comes. It is very difficult to tune the display width to the real width (228px). The picture keeps blur if the display width is not same as the real width.
Hope I express it clearly now. Actually this problem not only happens to .png images, but also .jpg images. I think it happens to any images as long as the image width is not same as the editor width.