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I use Itext7 with this exemple. some documents are very bad (unreadable) after resizing.

some scanning documents
Can you explain what you mean by "very bad (unreadable) after resizing" exactly? Do colors change to something with less contrast? Is the image skewed? - mkl
Please clarify your specific problem or provide additional details to highlight exactly what you need. As it's currently written, it's hard to tell exactly what you're asking. - Community
The document that contained an image becomes unreadable, without resizing the images (factor=1). By saving all the images that come from the original document, I have (the impression that) Itext reads the same image in 2 different images - Madal Africa-Guinea
As others have pointed out your question is quite unclear. Can you provide your input and output PDF files? If you are looking to reduce the file size of your document you might want to use the iText 7 add-on pdfOptimizer - kHLVT