How to save rasterized files in a given folder?
By default, PDF2Image saves rasterized files in the current workingfolder. To specify another output location, use the '-o' (or --output)parameter. For example:
pdf2image --o "c:\My Output" 1.pdf 2.pdf 3.pdf
Note: If the specified path does not exist, PDF2Image will attempt tocreate the necessary folders.
How can I control the output name for rasterized/converted images?
By default, PDF2Image creates a separate image file for every page inthe document. The output filename is constructed using the name of theinput PDF file, page counter, and appropriate image extension. Forexample, the following command-line generates a sequence of image filesstarting with mydoc_1.jpg, mydoc_2.jpg, etc.:
pdf2image -f jpg mydoc.pdf
PDF2Image allows output filename customizations using the '--prefix'and '--digits' options. For example, the following command-linegenerates a sequence of image files starting with newname_0001.jpg,newname_0002.jpg, etc.:
pdf2image -f jpg --prefix newname --digits 4 mydoc.pdf
The '--digits' parameter specifies the number of digits used in thepage counter portion of the output filename. By default, new digits areadded as needed, however this parameter could be used to format the pagecounter field to a uniform width (e.g. myfile0001.jpg, myfile0010.jpg,instead of myfile_1.jpg, myfile_10.jpg, etc).
To avoid any ambiguities in file naming, the prefix option should beused only for conversion of individual documents.
If your output image format is TIFF, you can convert PDF to a single,multi-page TIFF document using the '--multipage' option (See 'How do Iconvert PDF to multi-page TIF?' for an example).
How do I convert PDF to JPEG, PNG, TIF or some other image format?
By default, PDF2Image automatically converts PDF to PNG. The outputimage format can be modified using the '-f' (or --format) option. Forexample,
pdf2image -f jpg in.pdf
will convert PDF to JPEG.
The '--format' parameter accepts any of the following output formats:
png - (Portable Network Graphics)
png8 -- (Palletized PNG)
jpg or jpeg (Joint Photographic Expert Group)
tif or tiff (Tagged Image File Format)(Video) PDFTron SDK Demo -5 minute overview- View PDF, MS Office, images, customization, redaction, editing
bmp (Windows Bitmap Format)
raw (raw RGB or Gray data)
How do I convert PDF to multi-page TIF?
If your output image format is TIFF, you can convert PDF to a single,multi-page TIFF document instead of a separate file for every page usingthe '--multipage' option.
pdf2image --multipage -f tif --verb 3 mypdf.pdf
How do I open a password protected PDF?
PDF2Image will, without user intervention, decrypt and convert documentssecured with a master/owner password. If the document is secured using auser (or file open) password, PDF2Image will prompt you to enter thepassword.
For unattended conversion, the password can also be specified directlyon the command-line using the '-p' (or --password) option. For example:
pdf2image -p secret -f png secured.pdf
The above command line will convert PDF to PNG and will use the providedpassword ('secret') to open the secured document (i.e. 'secured.pdf').
Note: PDF2Image supports all standard security options available in PDF,including 40 and 128 bit RC4 encryption, Crypt filters, and 128 AES(Advanced Encryption Standard) encryption.
How do I create grayscale images?
By default, PDF2Image uses the RGB color model for rasterization andimage export. You can instruct PDF2Image to use single channel DeviceGray color model for rasterization and image export using the '--gray'option. For example:
pdf2image -f tiff --gray in.pdf
How do I specify which pages to convert?
By default, PDF2Image will rasterize and convert all PDF pages to outputimage format. You can specify a subset of pages to convert using the'-a' or '--pages' options. For example:
pdf2image -a 1,3,10 in.pdf
will convert only pages 1, 3, and 10. Please note that PDF2Image assumesthat all pages are numbered sequentially starting from page 1.
To specify a range of pages, use dash character between numbers. Forexample:
pdf2image -a 1,10-20,50- in.pdf
will render the first page, pages in the range from 10 to 20 and allpages starting with page 50 to the last page in the document.
All even pages can be selected using the 'e' (or 'even') string. Forexample, the following line renders all even pages:
pdf2image --pages even in.pdf
Similarly odd pages can be selected using the 'o' (or 'odd') string. Thefollowing line renders all odd pages in the document and every page inthe range from 100 to the last page:
pdf2image --pages odd,100- in.pdf
How do I specify the resolution of the output image?
Using PDF2Image output image resolution can be specified explicitly(using the '--d' or '--dpi' option) or implicitly (using the '--hres'and '--vres' parameters). In this section, we cover the use of the'--dpi' parameter. For more information on the '--hres' and '--vres'parameters, see 'How do I specify dimensions of the output image inpixels?'
By default, PDF2Image uses resolution of 92 Dots Per Inch (DPI), whichis the typical screen resolution. Smaller DPI numbers result in smallerimages (e.g. suitable for use as thumbnails), while larger DPI numbersgenerate larger images (e.g. suitable for high-quality output).
For example, to convert a PDF document to a multi-page TIF at 300 DPI(Dots Per Inch), use the following line:
pdf2image -f tif --multipage --dpi 300 in.pdf
Depending on the dimensions of the input page, high DPI/resolutionrasterization requires lots of memory. For example, rasterization of asingle A4 page (8x11) at 1000 DPI will require more than 350MB ofmemory. If PDF2Image fails to allocate enough memory, you can render theimage in stripes or tiles, as described in 'How do I renderhigh-resolution images', or by trying to decrease DPI value.
A 'typical' range of acceptable DPI values is between 1 and 1000 DPI.PDF2Image can rasterize images beyond 1000 or 2000 DPI using tiled orstriped rendering.
How do I specify dimensions of the output image in pixels?
To specify absolute dimensions of the output image in pixels, use the'--hres' and '--vres' parameters.
When these parameters are specified, PDF2Image will automaticallydetermine the DPI (Dots Per Inch) ratio required to match the pixeldimensions of the output image.
For example, to generate 100 by 100 pixels thumbnails for a given PDF,you can use the following line:
pdf2image -f jpg --hres 100 --vres 100 in.pdf
Because the input PDF page may not perfectly fit the absolute pixel sizeof the output image, PDF2Image will also center the page and preservethe aspect ratio during rendering.
To generate images that are proportional in their size to the input PDFpages, simply omit one of the parameters (either --hres or --vres).For example,
pdf2image -f jpg --hres 100 in.pdf
will convert all PDF pages to images that are 100 pixels wide, withheight proportional to the dimensions of the input page.
Similarly, the following line will create images with fixed height (100pixels) and variable width (to preserve the aspect ratio).
pdf2image -f jpg --vres 100 in.pdf
How do I render only a subset of a given page?
Using PDF2Image you can rasterize a subset of a page using the '--clip'parameter. The parameter accepts a list of four numbers, separated usingcommas, giving the coordinates of a pair of diagonally opposite corners.Typically, the list takes the form: llx, lly, urx, ury specifying thelower-left x, lower-left y, upper-right x, and upper-right ycoordinates of the rectangle, in that order. The other two corners ofthe rectangle are then assumed to have coordinates (llx, ury) and(urx, lly). All coordinates need to be expressed in points (a basicunit of PDF 'user' coordinate system). One PDF point is 1⁄72 of an inchand is approximately the same as a point (unit commonly used in theprinting industry).
The '--clip' parameter is not only useful for cropping pages, but itcan be also used to speed up the rendering process and to reduce memoryconsumption (see 'How to I render very large images?' fordetails).
PDF2Image also supports clipping to predefined page regions, such aspage media, crop, trim, bleed, and art box. For more information onclipping to predefined regions, see 'How can I show/hide crop marksor the trim region?
How do I render very large images?
Depending on the dimensions of the input page, high DPI/resolutionrasterization requires lots of memory. For example, rasterization of asingle A4 page (8x11) at 1000 DPI will require more than 350MB ofmemory. If PDF2Image fails to allocate enough memory (a singlecontiguous block of memory), you can render the image in stripes ortiles by repeatedly rendering different regions of the page using the'--clip' parameter (also see 'How do I render only a subset of agiven page?').
For example, if the input page has a media box 0,0,595,842, you couldrender the page at 2000 DPI (Dots Per Inch) in four stripes (using 210.5point increments along the Y axis) as follows:
pdf2image --dpi 2000 --clip 0,0,595,210.5 --prefix t01 Test/tiger.pdf
pdf2image --dpi 2000 --clip 0,210.5,595,421 --prefix t02 Test/tiger.pdf
pdf2image --dpi 2000 --clip 0,421,595,631.5 --prefix t03 Test/tiger.pdf
pdf2image --dpi 2000 --clip 0,631.5,595,842 --prefix t04 Test/tiger.pdf
Rendering of the same image in a single pass would require more than 1.4GB in memory.
How do I batch convert files?
PDF2Image supports batch conversion of many PDF files in a single pass.To convert all PDF files in a given folder(s) you can use the followingsyntax:
The '--subfolders' option can be used to recursively process allsubfolders. For example, the following line will convert all documentsin 'myfolder1' and 'myfolder2' as well as all subfolders:
pdf2image --subfolders myfolder1 myfolder2
By default, PDF2Image will convert all files with the extension '.pdf'.To select different files based on the extension use the '--extension'parameter. For example, to convert all PDF documents with a customextension '.blob', you could use the following line:
pdf2image --extension .blob --subfolders myfolder1
How do I specify compression ratio for JPEG format?
The JPEG image format offers a lossy type of compression and the optionto trade between the loss in image quality and compression ratio. Tofine-tune JPEG compression quality, use the '--quality' parameter asillustrated in the following sample:
pdf2image --quality 80 -f jpg Test/tiger.pdf
Compression quality is a number in the range from 1 to 100. Lowernumbers usually result in better compression at the expense of imagequality. The default in 80.
How can I rotate pages?
By default, PDF2Image respects page rotation attribute. Image rotationcan be modified using the '-r' (or --rotate) option. For example, thefollowing line rotates all pages 90 degrees counterclockwise:
pdf2image --rotate 90 Test/tiger.pdf
Similarly, the following line rotates the page 270 degreescounterclockwise (or 90 degrees clockwise):
pdf2image --rotate 270 Test/tiger.pdf
How can I show/hide crop marks or the trim region?
A PDF page can define as many as five separate boundaries to controlvarious aspects of the imaging process:
The media box defines the boundaries of the physical medium on whichthe page is to be printed. It may include any extended areasurrounding the finished page for bleed, printing marks, or othersuch purposes. It may also include areas close to the edges of themedium that cannot be marked because of physical limitations of theoutput device. Content falling outside this boundary can safely bediscarded without affecting the meaning of the PDF file.
The crop box defines the region to which the contents of the pageare to be clipped (cropped) when displayed or printed. Unlike theother boxes, the crop box has no defined meaning in terms ofphysical page geometry or intended use; it merely imposes clippingon the page contents. The default value is the page's media box.
The bleed box defines the region to which the contents of the pageshould be clipped when output in a production environment. This mayinclude any extra bleed area needed to accommodate the physicallimitations of cutting, folding, and trimming equipment. The defaultvalue is the page's crop box.
The trim box defines the intended dimensions of the finished pageafter trimming. It may be smaller than the media box to allow forproduction related content, such as printing instructions, cutmarks, or color bars. The default value is the page's crop box.
The art box defines the extent of the page's meaningful content(including potential white space) as intended by the page's creator.The default value is the page's crop box.
By default, PDF2Image uses the page crop box as a default clip region.Different page regions can be selected as the default clip region usingthe -b (or --box) parameter. For example, the following line willinstruct PDF2Image to use the media box for rasterization:
pdf2image --box media in.pdf
How do I render PDF as CCITT Group 4 FAX TIFF or monochrome PNG?
To render the PDF as a monochrome (1 bit per pixel) image compressedusing G4 CCITT, simply add the option '--mono' within the command-linestring. For example,
pdf2image --mono -f TIFF --verb 10 --dpi 300 in.pdf
Does PDF2Image have any dependencies on third party components/software?
PDF2Image is a completely stand alone application and does not includeany dependencies on third-party components or software.
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