What DPI Should I Use for Scanning Documents?

What DPI Should I Use for Scanning Documents

The word “document” is a broad term, yet we’re going to narrow it down to being defined as bits of paper, used in your day to day office keeping. Pages such as quotations, receipts, and records. In the event that you are (legitimately, hopefully) scanning books or magazines then other standards will apply.

Adobe and the PDF file format

To put things into perspective, Adobe automatically assumes that PDF could bring together content from any source together in a solitary document. Whether scanned or created from an electronic source, (for example, Word), PDF innovation makes it simple to convey any document in an all-inclusive viewer. A PDF can contain and weave together a wide assortment of items, it is even conceivable to put scanned images and OCR-produced text together in the same document.

We’re additionally going to assume that a PDF file is the intelligent finished result of your scanning endeavors. PDF is the world’s best electronic document arrangement, all things considered. You can scan to any configuration you need, however, nowadays, that scan is probably going to end up a PDF, and not remain a “stripped” TIFF or JPEG.

Using scanners effectively

Scanners catch a computerized image of the item at first glance. When scanning materials it is vital to understand the concept of DPI (dots per inch). DPI is a detail utilized for printed (and scanned) media that decides quality. Scanned images with a higher DPI will look much better when compared with those of a lower DPI. However, scanning at a high DPI can take longer and results in larger file sizes.

While DPI alludes to physical measurements, the resolution of the image alludes to the extent of the image with respect to your PC screen. A file that is 4000 x 5000 pixels is perfect for chronicling, however, would take a long time to download on the Internet. When scanning documents the first consideration is to pick the correct file type. Normal types include .PDF, .JPG, GIF, TIF, and .PNG. The file sort you select will depend on the types of document you’re scanning, and its end purpose.

Different scan settings for various documents

Photographic images, for instance, would be done in JPEG or JPEG-2000 “lossy” format, an approach to shrink the image size with a negligible effect on quality. Screenshots and vector works of art might be best-taken care of as PNG files.

Some image change frameworks utilize an assortment of cutting edge programming to enhance clarity or lessen file size (or both). Adobe Systems incorporates a few improvement alternatives for scanned documents. Likewise, Adobe additionally gives a choice they call ClearScan, which perceives the text and images in every scan and changes over the substance properly.

Scanning text documents is a reasonably simple process that does not take a lot of time. The lowest DPI that is required for the scanned text to show and print properly is 300 DPI. If the text is going to be reproduced, a DPI setting of 600 or higher is recommended. When saving text documents it is best to save the files as .PDF. In the event that you need to alter the text, use the Optical Character Recognition (OCR) included with your scanner.


Any office oriented document scanned at exactly 200 DPI, Bitonal as a TIF will be around 41K in output. The file itself will be readable, and ought to be able to be messaged and downloaded reasonably effectively. At 300 DPI, Bitonal, that same file inflates to 62K, which is still moderately low, yet may devour significantly more space as you scan more pages.

When Scanning A Document, What File Type Should I Use?

When Scanning A Document, What File Type Should I Use

There are many factors to consider before you choose the DPI settings. Grayscale images are going to produce a different image when you scan them over 600 DPI while they are in a PNG file format.

For grayscale documents, you need to save a PDF file with a DPI of between 300 to 600. For files that are going to be hosted on the web, you can always save them as a GIF so you can reduce the overall file size for storage.

Comprehensive Differentiation of File Types

JPG is the most utilized image file format. Computerized cameras and pages regularly utilize JPG files – in light of the fact that JPG packs the data in the file using a reasonably small amount of space. However, JPG utilizes lossy pressure to finish this accomplishment, which is a significant drawback. For a smaller file, JPG is ideal, yet it comes at the cost of image quality.

The quality is selectable to an extent, with a choice setting named JPG Quality, using a lower quality for smaller files, or to be higher quality for bigger files. When all is said and done today, JPG is still fairly remarkable in this way, utilizing lossy pressure to allow small files of lower quality.

TIF is lossless (counting LZW pressure alternative), which is why it is considered the best quality format for business work. The TIF format is not really any “higher quality” per se (similar RGB image pixels, they are what they are), and most formats other than JPG are lossless as well. TIF just has no JPG ancient rarities, no extra misfortunes or JPG antiquities to corrupt and diminish the first.

What’s more, TIF is the most flexible, aside from the fact that that site pages don’t indicate TIF files. However, TIF does a large portion of anything you may need, from 1-bit to 48-bit shading, RGB, CMYK, LAB, or Indexed shading. Most of the “extraordinary” file sorts (for instance, camera RAW files, fax files, or multipage documents) depend on TIF format, yet with restrictive data labels.

PDF files are the best option for text documents, shapes, or different images containing text. A few programs, similar to Adobe Acrobat, utilize OCR innovation to scan the real characters of the text so you can edit the text later and search for words or expressions in the document. Since the PDF format incorporates programmed image pressure, it is a good decision for scanned images too.

PNG can supplant GIF today (web programs indicate both), and PNG additionally offers numerous alternatives of TIF as well (ordered or RGB, 1 to 48-bits, and so forth). PNG was created later than the others, with the intention of sidestepping LZW pressure patent issues with GIF, and since it is more current, it offers different choices as well (RGB shading modes, 16 bits, and so on).

One extra component of PNG is straightforwardness for 24 bit RGB images. Ordinarily, PNG files are somewhat smaller than LZW pressure in TIF or GIF (this uses lossless pressure, however PNG is slower to peruse or compose.) That patent circumstance has left now, however PNG stays great lossless pressure. Less utilized than TIF or JPG, however, PNG is another great decision for lossless quality work.


TIFF has ended up being a powerful file format for document stockpiling during the last 20 years and still has a part to play in document stockpiling. More and more though, PDF format has taken the lead, particularly for business applications. The ISO institutionalization of the PDF format has put to rest any second thoughts about the long-haul openness of the format.