PDF Creation

Bersoft Scan Helper (BSH) can generate Acrobat PDF files from images easily.

Click the tool bar button or the File > Create PDF menu command to make the Create PDF screen appear.

 

Notice that if some images are opened inside BSH the program will show a PDF Selection Dialog with two options:

 

You can create PDF files from scanned images that have not yet been saved to disk, by using the images currently opened.

If need you can add other images from the PDF Creation screen.

 

The PDF Creation screen is divided in two tabs, one for adding and sorting the images to be used and the other for setting all options for the PDF file.

Files Tab

Images can be added by using the Add Files or Add Folder buttons.

If the images were generated by BSH they will be already numbered sequentially, but if any page number is missing, BSH will ask if blank pages are to be inserted automatically, where needed.

The image file list can be sorted and arranged. Files can be removed from the list or added to it at any moment.

When any image file is selected, it will be shown on the right side at once.

Image files can be handled either by using the tool bar buttons located at the bottom of the screen or the contextual menu that pop-ups when the right mouse button is clicked.

 

Use the Save and Load Settings buttons to save both the file list as all the options in the Settings tab in a file, or to load the file list and options from a previously saved file.

Contextual menu

The contextual menu as commands for editing and replacing the selected image file by a blank page as well.

Also the Set PDF Page size according the selected image size can used to set the PDF Page size automatically.

 

After the list of files is complete and before generating the PDF file, options for PDF file generation can be set by using the Settings Tab.

Settings Tab

Here the paper size, margins, image compression and many other options can be set.

 

The image resolution can be reduced to generate smaller PDF files, specially when using large images.

Usually a resolution of 150 dpi (dots per inch) is enough for screen purposes, and 300 dpi is a typical value used for printing purposes.

Images that have lower resolution than the specified dpi value will not be modified, since enlarging an image would not improve its appearance.

When the resolution is changed, the resampling filter will affect the quality of the images and the time that takes to generate the PDF file. The default resampling filter is Mitchel, which provides good quality and is not too slow. Other filters may provide marginally better quality or work faster. Notice that the image quality may vary depending on the images that are used.

 

Rotate images for best fit will orient the images so that each is placed to maximize its use of space on the page (regardless whether the image is portrait or landscape).

 

The Blank Page legend sets the text (if any) that is to be shown on blank pages. Blank pages are appear in the PDF document in any place where a Blank Page was inserted in the file list. Where a blank page appears, the files list shows BLANK PAGE instead an image file name.

 

Specify Footers and/or Headers options if you removed the pages footers/headers when scanning and want to replace them with other ones.

The option Draw as a Bitmap is intended to produce PDF files that can be OCR processed by Acrobat.

See also PDF Numbering.

 

If the Roman numerals option is selected, the footers/headers can show roman numerals in the first pages and arabic ones in the remaining pages.

 

After setting the options for numerals, by clicking on the files on the File list you can preview how numeral option affect the numbering (but only when no more than one image per page layout is used). Learn more.

 

If the Apply Antialiasing filter is selected, images, and specially text, will look better, eliminating jagged edges, but  PDF files will grow in size and also, if the image have small text, it may became less legible.

 

Click the Save PDF button on the bottom to actually generate the PDF file.

 

File size

The source images file format does not affect the PDF file size, only the options set in the Settings tab and the source images size (width and height in pixels) will have an influence in the size of the created PDF files.

 

If the Image Compress Mode is None the images will take a lot of space. The image quality will be the highest, but the same image quality can be obtained by using Lossless compression, which is a best option.

 

Usually, for black and white or 8 bit palette color images, or when maximum image quality is required, the Image Compress Mode should be Lossless. Lossless compression will not reduce at all the image quality and will reduce the file size. Use this option for maximum image quality, when the file size doesn't matter.

 

JPEG compression (JPEG Image Compress Mode) only can be applied to Grayscale or 24 bit color images, and will produce far smaller PDF files.

 

The JPEG Quality default setting is 50%, which will create high quality PDF files. This is the more commonly used compression mode.

 

Values between 20% and 50% are recommended. Lower values generate smaller files with bad image quality.

 

Selecting values less than 10% will produce bad looking files and values higher than 50% will not increase much more the quality but surely will produce bigger files.

 

Another option to reduce the PDF file size is reducing the image size. It is done by selecting Set Resolution to and selecting a new resolution value for the images. This option is intended for reducing the images size, not enlarging them, therefore if the image resolution is the same or smaller than the selected resolution, it will not be changed at all.

A resolution of 150 dpi is a good choice for screen viewing up to 100% or 200% zoom values, and 300 dpi is enough resolution to get good copies when printing. The lower the resolution, the smaller the PDF file size and the faster its generation.

 

 

The compression and image resolution (dpi) settings specified when generating PDFs will not change the source image files at all, only will affect the generated PDF file.