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.