You can have a look on how it works below. The image below shows how smooth the noise seems to appear after it becomes Speckled. Use OCR Engine to Improve Speckle Resolution Using OCR Engine to Improve Speckle Resolution If you want to make your PDF more readable without changing the image's resolution, you can use OCR Engine to improve speckle resolution. Using ‛Speckle” to make the most of the text You can add the Speckle feature by placing ‛Speckles” at the end of the text and then click ‛Get ‛OCR” Convert scanned files with OCR Engine To scan files, open the photo, which you want to scan, you will see a menu, Select save and PDF. Now select print and select OCR Engine in the list. ‛Open open and you will download OCR Engine and OCR software. Now click scan in this program, and it will be converted to PDF file. Remove Speckles with Speckle will smooth out the text and make it read easier. This feature can be applied to scanned images, .tiff images, images that are scanned as images that can be added to .pdf documents. Using ‛Speckle” Choose ‛Clear Speckles” under speckled” option on ‛Speckle” options Or use ‛Speckle” no Speckles” to clear speckles in PDF files. How to Improve Speckle Resolution The ‛No Speckles” option helps to clear speckles and enhance the text quality of a .pdf document. The process can be as simple as choosing ‛Remove Speckles” under no Speckles” options in your ‛Speckle” options menu. Note: if you use ‛Speckle” you might notice the page size does not increase and there are speckles on the page. This is because the optimize Scanned PDF” function works on the size of the text blocks and not on .pdf file size.