![]() Make sure to replace password with the password of the PDF document. Pdftoppm -png -upw password protected-document.pdf output-images pdftoppm -png -opw password protected-document.pdf output-images ![]() The -opw and -upw flags stand for owner password and user password respectively. To convert password-protected PDF files using pdftoppm, use the -opw and -upw flags. To generate monochrome images with pdftoppm: pdftoppm -mono test-document.pdf output-images Convert Password-Protected PDF Files pdftoppm -gray test-document.pdf output-images The generated file will have the PGM extension. You can convert the PDF to grayscale images using the -gray flag. On Debian, Ubuntu, Linux Mint: sudo apt install imagemagick After installing ImageMagick, run the following command to convert the given PNG format image to Jpeg/Jpg format and then convert it to ASCII format: convert arch.png jpg:- jp2a - Please note the hyphen symbol (-) at the end. To add color filters to the output images, you simply need to replace the image format with the filter name. pdftoppm -png -rx 200 -ry 200 test-document.pdf output-images Adjust the Colors of the Output Images You can use the -rx and -ry flags to configure the DPI quality of the output images. However, you can specify a custom number to pdftoppm as well. DPI stands for dots per inch and refers to the resolution of an image. By default, the tool generates images with a DPI of 150. Using pdftoppm, you can also change the DPI of the images. To convert only the first page of a PDF: pdftoppm -png -f 1 -l 1 test-document.pdf output-images Configure DPI Quality of the Images The above command will only convert the pages 4 to 7 into images. pdftoppm -png -f 4 -l 7 test-document.pdf output-images The -f and -l stands for first and last respectively. ![]() If you want to convert only a specific range of pages in the document, use the -f and -l flags. If you do not specify a format, the tool generates the images with the PPM extension by default. Pdftoppm supports the following output formats: To convert the document into JPEG files: pdftoppm -jpeg test-document.pdf output-images To change the format of the output files, change the file extension in the command. For example, to use Question Mark ( ?) as the separator: pdftoppm -png -sep ? test-document.pdf output-images Change the Image Extension Each operating system is a little different, but in Ubuntu for example, the fonts are located within the /usr/share/fonts directory and contains a list of all available system fonts you may use in the above command.You can also change the character separator between the output name and the extension with the -sep flag. The selection of fonts varies depending on your computer, but all standard fonts that are generally used will be there. There is a huge list of colors available, and if desired you may list all colors supported by your computer with the command: cb:>showrgb Please note, you must be careful with the -draw option, which must begin in single quotes followed by the location of the top left most point, then by the text of the caption surrounded by double quotes. The above command will place a caption of "Warm Regards from the Family" onto the source image using the font Helvetica 14pt in yellow, with the top left point of the image starting at 270x160 pixels, and save the results in DEST_FILE. Use the following command to add a caption to an image: convert profile.jpg -pointsize 14 -font helvetica -fill yellow -draw 'text 270,160 "Warm Regards from the Family" ' profile_cap.jpg Another excellent feature of the convert tool is the ability to instantly add captions to images, including where in the image to place the caption, plus the font family, size and color to use.
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