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The -pdfquality sets the quality of the JPEG images that are used in a PDF file. The Quality must be between 1 (very low quality) and 100 (best quality). The higher the quality value, the larger the PDF file will be. The -pdfquality is only available for pages that will be saved with a bit-per-pixel higher than 1 (usually color and gray-scale images).
twainsave -filetype pdf -pdfproducer -pdfquality 60
Acquires to a PDF file and sets the JPEG quality factor to 60
The quality factor is 75.