![]() We also have to ask ourselves if the PDF contains photos and therefore we need 24-bit images, i.e. When converting from PDF to PNG we have to ask ourselves whether we want to use the default 300 DPI or whether we want to resample the image at a higher resolution 600 DPI or lower resolution 150 DPI. ![]() PDFs are typically multi-page, whereas PNG and JPEG are typically a single page.PNGs, however, are typically used for digital drawings and are typically 8-bit with a palette.The scanned images are typically full 24 bit RGB color (8 bits per band) and are typically compressed as JPEG.Typically scanners work at 300 DPI, sometimes higher at 600 DPI or lower at 150 DPI.I studied the answers presented and then compared them to my scanner which can scan to PDF or can scan to image (typically JPEG). Or, if you want to keep your transparent background, for a 100-page PDF, do for i in do \ (Note that the %d-counting is zero-based - file-000.png corresponds to page 1 of the PDF, 001 to page 2. This will create PNG files named page-000.png, page-001.png. If you want to have a separate PNG per PDF page, you can use the %d syntax: gs -sDEVICE=pngalpha -o file-%03d.png -r144 cover.pdf pipe used to avoid writing out a temp file on disk.Ĭomplete solution: gs -sDEVICE=pngalpha \. ![]() convert used for creating transparent background,. ![]()
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