The greater the dpi number, the higher the resolution. Image quality improves with higher resolution, but only up to a certain point, after which increasing resolution simply makes file sizes unmanageable without yielding any visible improvement to the image. A high-res image also takes longer to print. Most of the time, scans of up to 300 dpi are adequate. When dealing with resolution, it's important to distinguish between optical and interpolated resolution.
Interpolated resolution is resolution enhanced through software.
Choosing the best resolution setting Scanning at a higher resolution requires more time, memory, and disk space. When choosing a resolution setting, consider the type of image you're scanning and the print method. This gives 199.5 or 266. Lpi will vary, depending on the quality of the printing job. A higher-resolution image will not be any clearer on the monitor and will simply create larger files.