When a pdf is converted to a picture, it takes up a very small part of the picture

[dreamfly999]

I have the same problem as #248. After the pdf is converted into a picture, the original pdf only accounts for a small part of the bottom left corner. This problem is also not answered in #248, so I would like to give feedback on this problem again and hope to get your reply. The conversion results are as follows, and my pdf content appears only in the bottom left corner.